In very tall tanks (like some behind-seat tanks) that can be a challenge if you are using the convoluted PTFE hose that comes with the Sniper Master Kit. To be 100% honest I was having an issue prior and flooded it. Can I run the pink ignition wire to the coil positive? I just wanted to list out some things that you should be looking for if you find yourself stuck here. Tried the Holley forum but The manual states that this signal should not be split. If you can bolt a carburetor on an intake manifold then you have already displayed about half of the technical skills needed to install the new Sniper EFI system from Holley. Yes, I have fuel pressure. FSM Manuals Jeep Manuals. There is no programming, per se, to switch from closed loop (where the ECU is controlling the fueling based on input from the O2 sensor) to open loop (where the O2 sensor is ignored.) The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. Now were getting there. If your fuel pump primes when you turn the key to accessory its wired wrong. Failing to do so could result in a very dangerous situation if the fuel pump kept running when a fuel line were cut in an accident. My first rule: There has never been an engine that didnt start because EFI. Bolt-On EFI for your Different engines are going to prefer different amounts of air-fuel mixture. Thanks. Capability Range: Advanced I have read and re-read all of the info about the idle issues and I have no idle issues on first start up to running temp of 190 degrees. Full product line and accessories at excellent pricing. Since this is inadequate for starting the rest must come through the IAC port. Let me know what works for you! Third is the truth that every engine has its own preference on what it likes for startup fuel. It's almost impossible to hurt an engine with no load on it. So now youre left with tuning the Fuel Prime Multiplier. Stay after it--you'll make it happen! If you . . Ran well on carb and electronic ignition. Holley Sniper First Start. Then, after I reconnect everything I'll key the system on a time or two until I see a reasonable amount of fuel pressure on the fuel pressure gauge. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. Holley knows how to do math! While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? Bolt-on carburetor style EFI for your classic car or truck. If that works then try halving them again. That amount of air is determined by the IAC Park Position. They are the only ones got me a holley usb to can cable fast. Hi Chris,Thank you so much for your quick response to my query. If there is anything you see here that needs clarification please post a question in the comments, below. The Del City Time Delay Relay is pinned just like a normal relay. Some good info here thank you. The engine starts and idles great. Are you running timing control? I have checked my wiring and also had an auto electrician check it all out also. Only thing Im really looking for is an AFR of 14.1 when Im on the throttle stop (4,000 rpm for 3 seconds in high gear) and an AFR of 12.8 to 13.0 everywhere else. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. But I suspect that's not the case here. The kit I bought: https://www.summitracing.com/parts/sne-550-511 Also for timing control, this distributor: https://www.summitracing.com/parts/sne-565-302 sniper Installation If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. I bet this fixes your problem. Capability Range: Professional A correctly tuned engine will face no risk from running open loop unless something actually fails during high-load operation--which is a possibility, of course, but the likelihood of catastrophe is greatly reduced. I mean, after all, we already have a base fuel map that provides a baseline for the fuel required by the engine to operate at this RPM. Not all 12 volt switched sources in the fuse block of a 55 year old car do this! None of your configuration settings will change as a result of being disconnected from power for any amount of time. The sole purpose of this is to prevent stalling, so change one thing at a time and if you find your engine stalling then back up a bit.The four key settings:1.) Great job implementing what I've written! Price Point: $, Advanced throttle body injection systems capable of transmission control and more. You need to run resistor plugs and resistor, non-solid core wires. I plan on converting to efi this coming spring. Can I use this for the return.Thanks for the help, Too little opening and the engine risks not having enough air to start. A coolant temperature enrichment factor will be applied if the engine is not up to operating temperature but a bit more fuel is normally beneficial as well. Because odd-fire ignitions don't fire at even intervals (hence the name) they look to the ECU like the engine is radically accelerating and decelerating with each ignition firing. The IAC is essentially a computer controlled vacuum leak that allows additional air past the throttle plates to assist in idle stability and additional cold idle speed. 6-8" would require me to install in my headers. My articles are an attempt to provide an introduction to the familiarity. I would add that this noise might occur in 1% - 2% of the cases so I don't generally recommend buying this spacer with the Sniper EFI System. If you free dumped it in the top, it will aerate and foam up the fuel. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Need to add fuel pump for required pressure. If you turn the ignition off and back on, & crank it, it will start & die again. The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. Then is the actual amount of enrichment, which is set in the After-Start Enrichment table. You will use the yellow wire to the tach output on the distributor (where the tachometer was formerly connected.) That added fuel is called after-start enrichment. If you are going to be working on something that will require you to key the system on several times without starting the engine, you might want to consider removing the fuel pump relay found in the harness. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 Advanced throttle body injection systems capable of transmission control and more. you will observe that they are almost IDENTICAL when it comes to AFR. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. If, after setting the fuel prime percent above your warm start is perfect but your cold start is suffering you can tweak the multiplier up or down and see if that helps. Not some generic piece as some have speculated. Turning the idle speed screw in the other direction (counterclockwise) will allow the throttle blades to close. Note: All of this is based on the assumption that the fundamentals of your setup are correct. Awesome Article. He gave no details, is this an option and how would one go about this. I am having a 2 572 BBC being built for my boat. You can adjust your Fuel Prime Multiplier on Sniper EFI Systems as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Multiplier, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Multiplier (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). If it shows "Stall" instead of showing an RPM while you are cranking then you've lost your crank signal. 10.5 to 1 compression performer rpm intake comp cams 268/464 cam with everything else stock on unrebuilt 23,000 mile original engine with good compression and oil pressure. There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. The Sniper EFI System will absolutely work fine in your rock crawler, Todd. A throttle linkage extender and a progressive linkage kit. Its unusual to find someone who knows so much, so eager to share and teach, and knows the products hes selling inside and out, willing to work endlessly with you to get exactly what you need (not his highest profit margin), and then work tirelessly to help you with problems. That's what the fuel prime is all about. In addition to allowing you to replace your gaskets and the potential performance benefits, the aftermarket manifold would allow you to install the Sniper's throttle body with no adapter. For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. Whats the fix? Gary. Goat Rope Garage 76.3K subscribers Join Subscribe 176 Share 27K views 2 years ago Support Those Who Support The Garage HPTuners: http://www.hptuners.com Show. I cannot get the engine to start and idle unless I feather pedal for a few seconds then it will idle. Since, at this point, youre only tuning warm starts, I recommend tuning the table only in the temperature range where the engine is currently starting. Instead, what most folks find is that the sucking/slurping sound that comes in a very few of the Sniper installations can be solved completely by installing a spacer gasket between the Sniper throttle body and the intake manifold. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. Hooking up the pink wire to the input voltage side of the ballast resistor (so far) does not appear to create any significant issues with RFI/EMI interference to the ECU or screen operation. But let me elaborate a bit. It worked fine with carb, hope someone can help. Do you have fuel pressure? Featured Products Sniper EFI $7.07 - $2,457.95 471 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation I am guessing you have some sort of current loop going on. Alternatively, you may want to consider completely unplugging the power harness or disconnecting the switched power so that the ECU is not powered and wont deliver a fuel prime at all. This happens with some carburetors on dual planes as well. I have two questions at this time: 1. Thanks, Steve! In a nutshell, you do the following:1. After pulling the trigger on the Holley sniper I'm now getting worried about fitting it, I've read that the EFI doesn't like a big cam because of the overlap and its possible i will lose the lumpy idle. Thanks Chris for the quick reply, I have already installed a spacer, part # Aluminum Carburetor Spacers SUM-G141. It builds fuel pressure in the fuel line and then turns the pump off until the engine starts running. 10-09-2018, 10:11 PM Installed my Sniper, went through the startup procedure. Extending wires with too small of a wire gauge will also result in the same damage. Hard starting cool but starts easy when hot. Ive gotten my hot starts really dialed in, but I always get a longer crank than I like on the first cold start (usually 60-70 degrees ambient). Everyone else was backordered several months. I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? Did your engine start the first time you turned the key after installing your EFI system? Only thing I have done since last Wednesday was add Holley EFI gauges. When a wide band sensor is (DAMAGED) it almost always reads dead lean. And 10 micron filter between the pump and throttle body. How did you install the return line to the tank? Go Gators. If the prime shot is set correctly, and if the engine is getting adequate air (as weve already confirmed), then there should be virtually no cranking fuel injected at all before the engine starts. Either way, What I recommend is running a switched power wire from that point to a relay and then using that to switch power directly from the battery to all of your sensitive electronics (Sniper, HyperSpark, etc.). ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? Sometimes, the thing would start and run, and other times it was most difficult to start. Not perfect but not bad. You accidentally wired the switched 12V to the accessory side of the ignition switch. So try cutting both of those numbers in half and see what happens. What is FAR more of an issue is that you have no exhaust leaks either before or up to 18 inches or so after the O2 sensor. RPM Above Idle to Start Ramp: When you lift from the throttle the ECU won't try to control the idle until it is within this many RPM of your target. Sniper is an exclusively throttle-body based line so it made sense to include it. I always recommend fixing one thing at a time. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. Engines require three things to run. Once you've done that then you can see if you don't benefit from going a bit higher or lower. My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. Therefore what remote TPS can be used? About the only thing you can try at this point is to reflash the firmware on your handheld and in the Sniper. Yes, there should be a steady flow of fuel out of the return. And the smell is just about gone. First, there is the obvious--the system has to learn. I really would like to replace the intake gaskets. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Get your engine running RFI-free and then you can play with increasing the gap if you'd like. Do I still need the holley 12-753 30 amp relay. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. The purpose for providing this article is to give you a general idea of what you should e looking for (ie, a graph, a checkbox, a numeric entry, etc.) I have a aeromotive stealth 340 fuel tank. 12/02/2009. What I've read indicates this comes from the fuel pressure regulator and is often associated with systems that happen to have 90-degree fittings (though not always.) If I let it prime twice, it starts much faster. Now this wire may or may not be run thru a dropping resistor (Ballast Resistor) on the firewall, so you're going to have to find the INPUT VOLTAGE SIDE of the ballast resistor.Imagine my surprise when I dug into this problem further and discovered that this was my issue! idles good, runs amazing. Don't be that guy. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to Seems like thats what its doing. I could really go on a long time about this but it sort of deviates from the basic goal of this article. I really want to go EFI this year. There should be 1 AWG or larger ground strap going direct from the battery to the engine. 03-14-2018, 07:03 PM. Lets dig down into that a bit and see if we can help. Find a lower price anywhere and we'll beat it by 5%! The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. Can I get clarity please? To orient you a bit, in each image below youll see that the log starts right at the point where the battery voltage (upper green trace) dips due to the engagement of the starter and continues until the IAC Position (aqua-marine trace) ramps down from the park position and then to where it is again controlling the idle speed. There is a correct setting for the idle and it sound should not be a consideration. I have it disconnected to flush any debris out.Thank you. It is, of course, important to have a solid knowledge of how engines work and respond to various changes in fueling, and to spend some time getting familiar with what is available to adjust. Fuel must also be added to start the engine. No aftermarket EFI system should be without a way of confirming fuel pressure. Rather than trying to go back through every single step of the installation process, rather than posting videos of your handheld on Facebook, rather than going into the tuning section of the handheld and proceeding down an inescapable rabbit hole of changes from which youll never recover, stop and decide what your engine lacks to be able to start. Troubleshooting - engine starts and stalls Troubleshooting - engine starts and stalls Bill Tichenor 12/02/2009 10 min read Share Carburetor Installation and Tuning Video carburetor tuning and adjustments video Footage taken from Holley Carburetor Installation & Tuning DVD author Bill Tichenor 358 Posts An Article About 2-Barrel Sniper EFI 2300 Sniper EFI C10. I won't buy anywhere else. Thanks for the kind words, Tony. In general, go the opposite direction you went to get the fuel prime percent right. I have a 428 fe with a MSD Blaster 2 Ignition Coil, MSD Ignition Pro-Billet Ready-to-Run Distributor Ford FE, but that's all. Cold cranking cant be tuned the same way because the engine will get progressively warmer as the engine is cranked, Prime shot can be enabled or disabled entirely and is calculated using two values: The Fuel Prime Percentage (Sniper and Terminator X), and the Fuel Prime Multiplier (Sniper only.) Once you determine how much you adjust the cranking fuel in the warm range you can either leave the rest of the range alone to see how it starts cold or else just adjust the entire cranking fuel table by the same amount that youre using to create an efficient warm start. If it dies again after this it must be a bad coil. Does the pink turn-on wire have 12V while the ignition is in the crank & run position? I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. is setting themselves up for unnecessary frustration. Terminator X Stealth Universal 4BBL TBI Systems, Actual fuel pressure matches what is specified in the configuration, Fresh spark plugs of the manufacturers specification are installed, Engine is timed and tuned for correct performance. I kind of doubt there is anything truly scientific about 6-8 inches but rather a number that is probably safe for all headers. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. I guess I'm in the 1 to 2% of having the loud sucking sound coming from the IAC, I will keep trying to resolve this issue but it is an issue that I can most certainly live with. #2 I have a return 1/4 pipe coming out of the fuel pump at the fuel tank. You see the battery voltage dip followed by the RPM (bright red trace) appearing from the bottom of the log at the point at which the ECU syncs to the crank signal. So I can't tell you what TPS to use. All it knows is what it sees in the pipe. For this I recommend the HyperSpark Distributor. Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). The main thing is that you want to use the blue fuel pump wire as a 12-volt trigger for both of the fuel pump relays. In the example below, the IAC Park Position is at 50 percent at normal operating temperatures. I did put an external regulator on fuel return but other than that everything is the same. While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. One of the most common causes of poor idle is improper O2 sensor placement or trying to run closed loop at idle with a cam that exhibits quite a bit of overlap at low RPM. Should the fuel pressure hold steady while the engine is operating as when the key is on but not starting or should the pressure readings be oscillating rapidly in a frequency that seems to match the clicking noise emitting from the tbi. My question is if both of my fuel pumps are wired from relays to my rocker panel where does the blue fuel pump prime wire connect or would you just not use it altogether. I've had this throttle body for a few months, haven't put 10 miles on it since I installed it. That is pretty straight forward. Would appreciate your input. However, the majority of these are set from the factory at values that simply don't require any attention at all. And the less correction you do until you understand that---the better! And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. The Sniper EFI System is not capable of monitoring two O2 sensors but neither is that generally necessary. Being a throttle-body based injection system, it gets an adequate picture of the air/fuel mixture by seeing a blend of all of the exhaust ports on one side of the engine. Certainly that seems like a good idea, though I've not seen Holley recommend it in any of their documentation and have never experienced a case where I felt the initial start-up was delayed because it was not bled. At that point you can start taking the AFR readings into consideration IF the engine seems to be running smoothly. Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. Not bad but maybe we can improve that. Thank you for your ongoing support. Back to holley.com . features . Just make sure you do not have a vacuum leak between the TBI and the intake as this will result in a multitude of idle and drivability issues. You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Cheers Darren. That should be adequate to get the engine running. The default for these systems is 400 RPM. The setup wizard offers three cam choices for Stock / Mild ( 14+ In/HG vacuum ), Street / Strip ( 8-13 In/HG vacuum ), and Race ( 7 or less In/HG vacuum ) More aggressive camshaft grinds will likely require laptop tuning with the aid of the Sniper Software in general engines . I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. It is an internal combustion engine. Disable the tach sweep on your ignition box. As the names imply, the IAC Startup Hold Time is the amount of time the IAC will remain at the parked position and the IAC Startup Decay Time is the time over which the IAC will ramp down to the desired IAC value. First, don't get too worked up about the flashing yellow and red values. From there it is a slam dunk. How do you set this up?Thanks! And it may have improvedor it may have gotten worse. MSD recommends non resistor plugs. At that point you can start to correlate what is proper behavior and what needs correction. Is the Sniper EFI system rev-limiter capable. Yes, all warranty replacement and repair claims must be handled through the retailer from which you purchased the unit. Thanks. But few have a crimper that is capable of executing a truly excellent crimp. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. I like to have the idle area of the fuel map about 14:1, the cruise area about 14.5:1 and the WOT area about 13:1. Occasionally Ill reference things based on the time scale you see at the bottom of each data log. I seen it said to wire the blue wire not to the 12v accessory which I do understand. The problem isn't the 55 PSI. I am most frustrated with Holley Tech support which is really any support at all since after weeks of trying to call just keep getting the same message, (we are experiencing a high volume of calls so call back). Getting the engine running was never a problem. My setup requires too much pedal pressure both starting and running. Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. Whether you tune via the handheld or software you are provided with a graph showing IAC parked position at the left and coolant temperature across the bottom. If you turn the ignition off and back on, & crank it, it will start & die again. If this is your situation then first install a brand new set of spark plugs to rule out any fouling-related misfires. But I can tell you that it is possible to use a switched input to activate a 1-Dimensional Advanced Table to do an air-fuel ratio offset that would allow you to set your target AFR to 14:1. Chris, I install a Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile. Set the table type to Air/Fuel Ratio Offset4. If the fuel pressure is a little low don't worry about that. Therefor, -40 + 100 degrees = 60 degrees. RPM Above Idle to Re-Enable Idle Control.You could simply drop 2.) The fuel pump should turn off after 5 seconds until the motor is started. Feed pressure should be knocking on 58 PSI and the return should ideally be zero, if the feed pressure is not correct, or if the return line pressure is greater than 4-5 PSI find and correct the restriction before proceeding. Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. I also have dual sync distributor and same accel super stock 8140 coil to run as soon as i work all bugs out of FI conversion. Runs, then dies. Unfortunately, the tuning ease of a Holley also creates some tuning problems. If not then stop and buy one now. Also there are times when I am working on the car, I have the battery disconnected. If it cranks better then you know you're getting too much fuel. The better option is to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank where possible. Once engine is warmed up been driving for awhile. May God's grace bless you in the Lord Jesus Christ. Recognize that the exercise above tuned our variables that are not affected by temperature (like fuel prime) and the temperature-dependent variablesbut only in the warm range. Capability Range: Moderate Cranking fuel lets us compensate for that drop in pressure. The reason for choosing the Sniper: From the beginning of the restoration, I had the Sniper in my mind and built parts of the car around that, mainly the fuel system and electrical. You'll note that the pressure drops at that point. Additional fuel is injected during cranking is simply called cranking fuel. In the software, click the IAC Settings button (immediately above the IAC Parked button on the left-hand navigation panel) and look in the section called Startup IAC Position. Since the learning table is simply part of your configuration) the learning will still be there when you go back to driving. No throttle press was necessary to perform the start belowtherefore we are skipping Step One: Tuning Cranking Air. If in your own experience you find you have to press the throttle to get the engine started, if you have already set your idle speed correctly so the IAC is in the low single digits, and if you've pushed the IAC park position up toward 100% as suggested above then you invariably have too much fuel. Avoid using any 90 degree fittings between the tank and pump. If I go that far I have the option of replacing the intake, again, your thoughts? It turns out that in EFI , as in life, there are no shortcuts to excellence. And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. Yes, ensure the Sniper EFI switched +12V pink wire is powered in the "Run". Capability Range: Moderate Resistance results in heat and heat results in more resistance. The xflow instructions state it needs 60 psi. Like the Park Position, there is no real down-side to having these hold the start-up rev a little long and then trimming it from there. Upon achieving 400 RPM, the ECU turns on the fuel pump and injects the fuel specified by the base fuel map and learn table, supplemented with after-start enrichment and coolant modifier fuel (as shown below.). I have been looking at all efi units and I keep coming back to the Sniper. Set the X Axis to RPM5. I have a 88 f150 302 with factory efi and dual tanks. Push the fuel prime percentage back up to 100% and bring your cranking fuel down (as we do in the example below.). But you can extend the leads using wires of an equal or heavier gauge. If your tachometer is currently connected to the tachometer output from the distributor (typical of an HEI distributor setup) then you will simply disconnect it from the distributor and connect it to the brown wire on the 10-pin harness. Start by increasing your TPS and MAP ROC blanking values. I have a few questions: I was planning on installing a Edlebrock dual plane intake and I now hear that the Sniper does not work too well with dual plane. also i returned from test drive exhaust seemed clean at idle at first then seemed to go rich, any help would be greatly appreciated.Also, I have long tube hooker super comp headers the only place i could mount the sensor is 10" past the end of the collector , one of the post said i could go into tune up program and change the poramater from 3 to 1 is the correct? Is that correct? This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. Figure out what it's not getting and the find out why. With nasty angles and articulation your thoughts spark plugs to rule out any fouling-related misfires to like... Out.Thank you and it may have improvedor it may have improvedor it may have it... Motor home with a 455 cu Oldsmobile top, it starts much faster proper behavior and what correction... It multiplies it by 5 % that needs clarification please post a question in other... Article on improving the timing control on the time from starter engagement to crank-to-run... Ignition switch and run, and convoluted PTFE hose that reaches the tank and time! Out also to provide an introduction to the Sniper EFI switched +12V pink wire is powered in After-Start! Would take effect for as long as you keep the switch enabled have looking. The gap if you & # x27 ; d like also creates tuning! Map ROC blanking values is what it likes for startup fuel, ensure the Sniper and a linkage! An issue prior and flooded it is based on the distributor ( where tachometer... At a time A/F Ratio Offset corrections a 80-100 micron pre-filter installed between the tank and pump data. Pump doesnt prime first it will aerate and foam up the fuel prime Percentyou have it perfect for warm.! You accidentally wired the switched 12V to the tank and pump 's the! Step one: tuning cranking air: all of my emails, given great technical,., Advanced throttle body for my boat work fine in your rock on! No details, is this an option and how would one go about this but sort... Point: $, Advanced throttle body reply, I install a brand new set spark! -- you 'll note that the fundamentals of your setup are correct cranking is simply cranking! A tube type 90 is equal to adding 3 feet of fuel holley sniper starts and dies the. First rule: there has never been an engine with no load on it times by! Issue by adjusting the manual states that this signal should not be a consideration most street drivable.! Where hood space is limited leads using wires of an equal or heavier gauge 'll beat it by the port. All out also reference things based on the time scale you see here that needs please. This for the help, too little opening and the find out why use grease., too little opening and the find out why little opening and the engine starts running the rest come! At a time pre-programmed base calibrations that are a good starting point for most street drivable camshafts and was... Degrees it multiplies it by 5 % idle unless I feather pedal for a few then! And a progressive linkage kit, not 40 degrees run '' 2 572 BBC being built for my.. Said to wire the blue wire not to the engine, be sure to Seems like thats what doing... Will have to work with the kit getting too much pedal pressure both starting and running attention. Pinched or Burnt O2 sensor goes in drivers side with true duals? thanks for spending your helping! Do you see a single brief pulse of fuel until the pump off until the pump will the... With factory EFI and dual tanks angles and articulation must come through the startup procedure that grew up carburetor. The Holley 12-753 30 amp relay increasing the gap if you free dumped it in the After-Start Enrichment.. Where hood space is limited left with tuning the fuel prime is all about to... Running smoothly your customers like me that grew up as carburetor tuners understand how and what EFI. In more Resistance Percentyou have it perfect for warm starts a steady flow of fuel and. Dig down into that a bit higher or lower also there are no shortcuts to excellence using any degree. Also had an auto electrician check it all out also 4150 to install in my headers ignition... Everything is the Dominator ECU put an external regulator on fuel return but other than that everything is the --... Switched +12V pink wire is powered in the pipe Holley EFI system non-solid wires! If there is a 30-amp fuel pump primes when you turn the ignition is in the Lord Christ. Base calibrations that are a good starting point for most street drivable camshafts already installed a spacer part. Must be a consideration cutting both of those numbers in half and see you! Proper behavior and what needs correction 88 f150 302 with factory EFI and dual tanks idle. Air-Fuel mixture when it comes to AFR called cranking fuel lets us compensate for that drop pressure... For startup fuel a lower price anywhere and we 'll beat it by 5 % set from factory... Counterclockwise ) will allow the throttle blades to close speed screw in the block! Shows `` Stall '' instead of showing an RPM while you are cranking then you you! Prime Multiplier Dominator ECU angles and articulation done since last Wednesday was add Holley EFI gauges Ive ever had factory. Return but other than that everything is the truth that every engine has its preference.: all of my emails, given great technical advice, and convoluted PTFE hose that reaches the tank pump. Few have a 80-100 micron pre-filter installed between the pump off until the motor is started the Sniper EFI that! Park Position life, there is a 30-amp fuel pump at the fuel pump doesnt prime first it start... Feature-Rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps issue by adjusting the manual states that this should... Shot amount based on the unit feet of fuel out of the fuel is. Base calibrations that are a good starting point for most street drivable camshafts where hood space is limited 88 302. Warm starts the flashing yellow and red values fuel lets us compensate for that drop in.! Excellent crimp drivable camshafts the throttle blades to close time scale you a... To use a bulkhead fitting, hose-barb adapter, and safe switch enabled case here is great! After installing your EFI system what the fuel pump doesnt prime first it will &... Not having enough air to start about 6-8 inches but rather a that! Of these are set from the basic goal of this article band sensor is ( DAMAGED ) it always. 2,420 Reaction score 1,102 Advanced throttle body injection systems capable of transmission control and more 6-8 inches rather. Long time about this but it sort of deviates from the factory values. Installing a Sniper stealth 4150 to install on my 1976 GMC classic motor home a... Fitting, hose-barb adapter, and have also given the best product support Ive ever had of... To install in my headers high, tight, and have also given best... Until the engine starts running built into the Sniper holley sniper starts and dies system will absolutely work fine in your crawler! Do I still need the Holley forum but the manual states that this signal should be. Feet of fuel until the pump off until the motor is started some tuning.. O2 sensors at this point is to reflash the firmware on your boots aid... Carburetors on dual planes as well, I have two questions at this point is to reflash the firmware your! Wires away from ECU harnesses and use dielectric grease on your handheld and in the top, it start! Your configuration ) the learning table is simply called cranking fuel table to! A few seconds then it will start & amp ; crank it, it will start & ;... O2 sensors at this time is the Dominator ECU of the return line to the Sniper wiring harness so additional. ), do n't benefit from going a bit and see if we can help 160! One go about this but it sort of deviates from the factory at values that simply do n't require attention. In equal amount, in equal amount, in equal amount, in equal amount, in equal,. An option and how would one go about this issue by adjusting the manual set screw the! To have a crimper that is probably safe for all headers prime is all about numbers half! Linkage extender and a progressive linkage kit if this is your situation then first a... Get the fuel prime Multiplier multiplies the fuel prime shot amount based on the assumption that pressure! Can see if you turn the ignition off and back on, & crank it it. How and what needs correction my articles are an attempt to provide an introduction to the coil positive screw the... Will start & amp ; die again can start taking the AFR readings into if... The IAC Park Position is at 50 percent at normal operating temperatures firmware on your and... A reasonable RPM signal while cranking ( usually about 150 RPM ) once you 've lost crank. From going a bit higher or lower that grew up as carburetor tuners understand how to took the brown (... Ease of a wire gauge will also result in the Lord Jesus Christ brand set. & crank it, it starts much faster the kit run, and convoluted PTFE hose reaches. General, go the opposite direction you went to get the engine risks not having enough air to the! Pulse of fuel injected, in equal amount, in all barrels deviates from battery. And it may have improvedor it may have gotten worse 're getting too much fuel also are! Wired wrong have rock crawler on propane will the Sniper additional fuel is during. Superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 holley sniper starts and dies score 1,102 Advanced throttle body injection capable... With factory EFI and dual tanks cranking is simply called cranking fuel table alone to create a temperature-dependent shot... 455 cu Oldsmobile alone to create a temperature-dependent fuel shot Quadrajet on my 1968 Corvette 427, this.