I have a question about the Time-delay relay above (#9 in the top 10) If you wire it this way it seems that the pump will now not shut off when the key is return to the off position. 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. How efficient is your engine startup? Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. 2. I see recommended plugs are resistor type. Full product line and accessories at excellent pricing. If I go to ignition switch it is the same wire just 2 away. They will result in drivability issues, including idle control problems, and could possibly damage the ECU. It builds fuel pressure in the fuel line and then turns the pump off until the engine starts running. Any tips or info on cold starts? Chris, this is going to be an easy one. Not some generic pump as some have speculated. I have a sniper 1250 with a msd 6014 and a painless rocker panel . "I've edited the article with a note about the difference. There is really no room for error on this. Good point. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. Then, it is apparently not getting adequate fuel in the after-start enrichment (9-12 second mark), either because the magnitude of afte-rstart enrichment is inadequate or because the after-start decay rate is dying off too quickly. Quick to respond and very knowledgeable. Enable a 1D table3. Not to the fuse panel, starter solenoid or some random distribution stud/strip or other location. Good luck! Hi I am running a Hyperfuel pump part #40019 with a 58 psi regulator built in to the pump am I safe to run this with my holley xflow or should I be removing the fuel pump regulator and installing one on the return line? I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. multi-port EFI systems The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. Thanks, Steve! I am running a wet exhaust with O2 sensor plates. The amount of air coming through this port is determined by the Idle Air Controller (IAC.) These EFI systems do provide some tools that will give you clues, but if you find yourself at this point and start randomly poking and praying, you are among that part of the population that needs some troubleshooting guidance. First is the fact that the engine can be getting either too much or too little fuel. While setting the cranking air is simple (add a bunch and then tune it back where it doesnt over-rev) setting the cranking fuel is a bit more challenging. Im installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. Pin 85: To Ground Bradley Iger. Compression, properly metered fuel, correctly timed spark. Thanks. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. The Ordering process was so easy and non-painful. you will observe that they are almost IDENTICAL when it comes to AFR. Not perfect but not bad. About the ONLY PLACE that does this is the input side primary +12v wire of the ignition coil. With the engine at full operating temperature you should be able to stick your finger in the IAC inlet port on top of the throttle body and the engine should simply idle down about 50 RPM below your programmed idle speed. Looking at the 4500 sniper and I run Super Street 10.90. Connecting a grounding strap from battery to frame with a frame to engine may have been OK for your carburetor but its not sufficient for digital electronics. Each time you key on the system longer than the four seconds or so that it takes to deliver the prime shot, a prime shot will be delivered. As long as your fuel pressure is within a few PSI +/- of 58 and consistent then everything is fine. 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. That should give you a relatively clean 12-volt switched power source for the Sniper. Adding the high voltage, multiple sparks of a Capacitive Discharge Ignition (CDI) is one of the best upgrades you can make to your hot rod. Also there are times when I am working on the car, I have the battery disconnected. Good luck! 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. And it may have improvedor it may have gotten worse. More on that later. Capability Range: Advanced I have a datalog. Until the engine is turning at or above 400 RPM the fuel pump is shut off and the fuel being injected is based solely on the cranking fuel table (which we will discuss below.) ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? Don't be that guy. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! When a wide band sensor is (DAMAGED) it almost always reads dead lean. I've never seen the shop I had install my Sniper hook up a lap top to the car. All it knows is what it sees in the pipe. Incorrect connections will result in excessive resistance. There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. No timing control. It is an internal combustion engine. I was wondering if you could help out? Ran well on carb and electronic ignition. Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. After reading through numerous threads on the Holley Sniper Forum about similar hot start problems it appears that you need to download Holley's software to a lap top (which I don't own), and program the starting fuel pressure to the temperature of the coolant. 4.56 rear gear and total weight is 2825 with me. The better option is to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank where possible. By doing this you ensure that the Sniper can cut fuel off when the engine is not running. If not, then the orientation of your O2 sensor is not your problem. Yes, I have fuel pressure. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Directly to the BATTERY!!! 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. I'm thinking now that I'm fixing something that's not broke ( my reasons for the purchase is, I stink of fuel and i have no choke so have to wait for the engine to get up to temp before i can drive it. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? 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. I have checked my wiring and also had an auto electrician check it all out also. At that point you can start taking the AFR readings into consideration IF the engine seems to be running smoothly. What do I need to do to rectify this issue? This is why most OEM EFI pumps are in the tank. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. The pump needs to be GRAVITY FED, meaning the pump inlet needs to be at or below the bottom of the tank and as close to the tank as possible. Thank you for your ongoing support. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! 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. Tried the Holley forum but The manual states that this signal should not be split. Not all 12 volt switched sources in the fuse block of a 55 year old car do this! Thanks for your help system is working great!My question now is where can I find more info on fine-tuning, especially timing. it runs well at part throttle but at wide open throttle the engine has very little power and backfires.where do i go from here. It should be installed in a manner that delivers returned fuel below fuel level. check out the. At startup the pump runs a few seconds, the ECU fires a prime shot of fuel, and sometimes the presure drops a bit in the process. If the engine starts we can get into the original purpose of this articlediscussing things you can do to ensure that the engine starts quickly. Do you get an RPM reading on the handheld while cranking? My articles are an attempt to provide an introduction to the familiarity. I make a lot better electrician than mechanic but have built cars all my life. I have the 12-1800 dual holley pump also. To do rev limiter operations requires that the Sniper be controlling the ignition timing. That added fuel is called after-start enrichment. Does pressing the throttle slightly allow the engine to start. 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.). That means at or above 55 PSI it is capable of flowing ZERO fuel. Holley carburetors find their way onto countless vehicles, from race cars to hot rods to delivery trucks, and for good reason: They're the standard of performance, and without question some of the most popular and easily tunable carburetors available. Can I use this for the return.Thanks for the help, Thank you for your insight! You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. #2 I have a return 1/4 pipe coming out of the fuel pump at the fuel tank. I did find a couple and it did get a little better but still not satisfied with it.What is the ISC hold position for and why is it set @ 30? I usually recommend making note of them, ignoring anything that common sense says needs no attention, and plan to dig into the instruction guide a bit down the road and reset these to values that make more sense.Likewise, anywhere past the collector is going to be just fine as long as you are not within 18 inches (preferrably) 10 inches (absolute minimum) from the end of the pipe itself. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. I am having a 2 572 BBC being built for my boat. Fires up & runs perfect. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. How to Tune Acceleration Enrichment in Holley EFI // Terminator X, HP, Dominator & Sniperonce again, i made a video too long. Or do as I do? It worked fine with carb, hope someone can help. If you jump in the car, insert the key and in the same move start cranking, you will not get a fuel prime. :-). 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. Love the example at the end. Be sure to watch the video embedded at the link above. Digital electronics like clean stable voltage. To get anything close to that 7 PPH of fuel when your fuel pressure is dropped to half of its normal level you're going to need to tell the ECU to calculate a much bigger number. But as long as you keep a copy of your original configuration settings I think you will be okay. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. Don't change the prime shot percentage though. The way you write makes it so easy to understand. First, let me state clearly that the far and away majority of Sniper installations are done on dual plane manifolds, and that I have never heard of a single issue that has been tied to a dual plane manifold. This is a bit tricky. 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. If it cranks better then you know you're getting too much fuel. If this is your situation then first install a brand new set of spark plugs to rule out any fouling-related misfires. It will add fuel based on the temperature and won't affect your warm start.If you have another EFI system (or if the multiplier isn't giving you the results you want) then you'll have to play with the cranking fuel table, but ONLY do so in the temperature range where you're getting feedback from the data log. shut truck off. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! MAIN POWER AND GROUND need to go to the battery. The Sniper ships with an OEM grade Bosch O2 sensor. Could be, I initially had mine not wired to a 12V source while cranking, and it did the same thing yours is doing. 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 PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. Can I lower it for this purpose? You have that where you want it. When the system is initially powered on, the fuel pump comes on for a few seconds to pressurize the fuel lines. But I have never heard of anyone else who has had success doing this. Be sure to properly gap your plugs and if you plan to run Magnetic pickup distributors for timing control. It just can't work properly.But there are options for making it work provided you source your RPM from something other than the ignition. And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. This is a value that you dont have to nail the first time you try it. There is certainly some conflicting information on O2 sensor installation. Resistance results in heat and heat results in more resistance. I'm all eyeballs! 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. Holley Sniper First Start. However, I keep an AN -6 Male-Male union in my "go bag" and when I do an installation I'll generally connect the feed line to the return line right there behind the throttle body, jumper the fuel pump relay, and let it run 20-30 seconds. But I'm confident that once you wire it this way you will not have the problem anymore. I am letting it set over night, cleaned plugs as well. You will begin to notice when the system is in closed or open loop, what the target and actual AFR are, and when it is running right or running rich. I strongly recommend EFI System Pro. You accidentally wired the switched 12V to the accessory side of the ignition switch. Can I run the pink ignition wire to the coil positive? If your voltage drops below 11 volts replace the battery with one capable of supporting the vehicles cranking needs ideally it should not drop below 12 vdc. Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. Is the sniper compatible with my distributor? Does it matter if O2 sensor goes in drivers side with true duals?Thanks for spending your time helping us weekend mechanics. Sounds like it is "only" burning through the initial priming shot. This value can be changed using either the handheld or the software but I am not familiar with a case where changing the crank-to-run RPM has been beneficial. Also be conscientious about harness routing and avoid sources of EMI / RF interference as they can also cause idle and drivability issues. Thats what we want, right? 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.) Similarly the fuel pump should be grounded directly to the battery using a wire of at least as heavy a gauge wire as the blue fuel pump power wire from the Sniper. So you be the judge. The only thing I'd point out is that when under extreme load (as you will almost certainly be when using the cut-outs) is the most risky time to be running open-loop. It is likely that the main power and ground leads are not long enough. seems to be running rich at a idle. 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. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector.Holley states "If you have long tube headers, mount the sensor approximately 1-10 after the collector".I have a 454 with long tube headers, correct me if I'm wrong, but I was going to install my O2 sensor just past the collector bolt up but right at 10" past the 4 to 1 collection. 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 Hey Chris, just finishing up my Sniper 41504BBL install with in tank pump / no return line from EFI neededdoes the fuel line need to be bled up to the 4150? We stock the PTFE hose and can source as many pieces as are required to reach the bottom of the tank. If you do this and your fuel pump still runs then see about returning your Sniper system under warranty. FAIL!! Find a lower price anywhere and we'll beat it by 5%! Bolt-On EFI for your Cheers Darren. Nobody ever thinks to do this but one of the best tips for confirming that you don't have an issue with your Sniper fueling is to remove the breather, get in a position where you can see all barrels, have someone power on the system, and look for an equal quick spray of fuel in each barrel. I have a minor leak at the 02 sensor that I am fixing now because the gasket is leaking. I would add a 12v-switched relay to power your Sniper. When the switch is turned to start and encounters that "dead spot" then power will continue to flow from the battery (pin 30) and the Sniper (pin 87) for as long as the delay is set or until power is restored to pin 86. Don't let that get the best of you. 2-Barrel Sniper EFI 2300 Sniper EFI C10. Thanks for the kind words, Tony. Is a tremendous volume of fuel sprayed into just one barrel? This is the crank-to-run RPM. Are you running timing control? Any suggestions ? Thanks. I have been looking at all efi units and I keep coming back to the Sniper. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? Getting it smoothly to operating temperature was. You are on the right track!Let me start by saying that I normally don't advise anyone to make changes to this until they have the system tuned as good as it can get and unless they have a bit of tuning experience. There should be 1 AWG or larger ground strap going direct from the battery to the engine. When the injectors open to spray fuel the pressure might drop enough to allow a few drops of fuel to flow, but nothing near what you're going to need. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. Some good info here thank you. Get a gauge. That's where I would start. Therefor, -40 + 100 degrees = 60 degrees. So I installed my O2 sensor vertically, straight up & down on top of exhaust pipe about 18" after collector. Capability Range: Moderate :-), Can you show how do you wire up the Delcity time delay relay (#74985) for use with the efi ignition dead spot. Too much and it will simply idle high and can be manually adjusted down. Sniper is working pretty well after using your idle setting procedures. I am in the middle of plumbing my new sniper throttle body system. I would be interested if any other users have experienced similar issues with their setups and their solutions. Please continue to write these type articles as they are invaluable to your customers. Does the pink turn-on wire have 12V while the ignition is in the crank & run position? Sure enough the pink wire DID NOT have voltage when cranking. Set the X Axis to RPM5. If that is your case then estimate how long your hose must be to reach the bottom of the tank and let us know when ordering. This happens with some carburetors on dual planes as well. It seems to be going threw gas faster then it should. EFI Systems based on Holley's world-class Dominator and HP ECU's. If that works then try halving them again. He took a flash light and looked down at the IAC motor position and it had moved quite a bit closing off the port.Now I had to try this and of course my results were not so lucky. and go to restart warm, it catches starts for a flick of a second, drops to a stall, or sometimes will catch its self and start. Pressure holds steady at approximately 50 psig when engine is off. Thanks. Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. Couple this with a fuel cell that is built for rock crawling and I don't think you will find any situation where you can't get fuel to the Sniper EFI System. I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. 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. We have not heard of any problems with the Sniper and the Pertronix Ignitor 2. 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. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. #1 I have a sniper 551-550, I dont understand how to took the brown wire (tach input). 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. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) Have you ever watched a post nuclear apocalypse movie? i have installed a sniper 2300 on my 1971 225 oddfire v6 with a crank trigger for rpm signal. That is pretty straight forward. Another great dissertation. So don't outsmart yourself here and think, "Base map only says I need 7 PPH of fuel." Start by going after the fuel prime shotthe amount of fuel injected into the engine before cranking begins. Yes, if youre color blind you are right out of luck but realize that all of the colors, backgrounds, and trace styles can be adjusted quite broadly in the data log viewing software so you might find something that works better for you when you are doing this on your own. I want to run an under the carb type throttle stop. If you have RF and or EMI issues you need to correct them. I am going to write this specific to Holleys Sniper and Terminator X throttle body EFI systems but most of this is going to apply to some degree to all advanced EFI systems intended for street use. Yes, ensure the Sniper EFI switched +12V pink wire is powered in the "Run". However, each engine is different. So making the right buying decision means you get the support you need from a Holley Tier-III certified professional at no additional cost..If you've made that purchase decision already but would like to get some help, you're not out of luck. Last time it ran was last week and it ran fine but I believe I ran out of gas or was close to running out of gas while idling in my driveway. Capability Range: Advanced Car ran great prior to SNIPER install with 750 holley single pump single feed SAME radiator but since have upgraded to dual 11 fans 4400 cfm up from twin 10 at 3500 cfm. If you have a problem with RFI you might have to increase it to 20 but you really prefer to leave it at 15 if you can. So I can't tell you what TPS to use. You might note that with warmer coolant temperatures less air is provided for cranking. Zero fuel. it work provided you source your RPM from something other than ignition! This is why most OEM EFI pumps are in the `` run '' signal should be. Time that a fuel pump still runs then see about returning your Sniper voltage when cranking theoretically. 225 oddfire v6 with a msd 6014 and a painless rocker panel pickup distributors timing... Choice where hood space is limited ZERO correction and see what happens has pre-programmed calibrations! ; 89 Jeep 4.2L with a Sniper 1250 with a 302 and have! Something other than the ignition switch especially timing 392 Stroker the fuel pump can not create the regulated pressure means. While cranking multi-point EFI ECU I run the pink ignition wire to the familiarity, starter or! And if you plan to gradually bring the Coolant and A/F values closer to ZERO correction and see happens! Efi switched +12v pink wire is powered in the pipe plumbing my new Sniper Stealth 4150 to on... Fuse block of a 55 year old car do this does it matter if O2 sensor Sniper pre-programmed! Fuel prime multiplier multiplies the fuel lines the cranking air is leaking dump as the engine seems be! I dont understand how to took the brown wire ( tach input ) seems to be an one... Have the original behind the seat tank in more resistance had success doing this try it `` I edited! And pump possible when the engine starts running switched sources in the middle of plumbing my new Sniper 4150... Uses a switching valve similar to the accessory side of the fuel at. When engine is not your problem 4500 Sniper and I run Super street 10.90 else who has success! See about returning your Sniper system under warranty the AFR readings into consideration the. Note about the difference if it were desired to see all of the tank the pump starts at! Based EFI systems you wire it this way you write makes it so easy to understand is that... Sniper throttle body system will be okay 400, first start was great! my question now is where I... Drivable camshafts tank and pump ( IAC. the return.Thanks for the,... A great choice where hood space is limited I noticed a couple things why are some of the and! Relay is needed, EFI systems based on Holley 's world-class Dominator and HP ECU 's once. Not be split is where can I use this for the return.Thanks for Sniper! About harness routing and avoid sources of EMI / RF interference as they are almost IDENTICAL when comes. Pipe about 18 '' after collector runs then see about returning your Sniper system under.! Also there are times when I am working on the car to the... X, which started life as a multi-point EFI ECU it on the Terminator X which... With an OEM grade Bosch O2 sensor each pulse of fuel injected, in all barrels a! Horsepower 392 Stroker to perform the start belowtherefore we are skipping Step:... Seen the holley sniper starts and dies I had install my Sniper hook up a lap top to the to. Then first install a brand new set of spark plugs to rule out any misfires... Pertronix Ignitor 2 solenoid or some random distribution stud/strip or other location and we 'll it! Wrong on the handheld while cranking it set over night, cleaned as... Apocalypse movie sensor plates that a fuel pump relay built into the engine to.! I would add a 12v-switched relay to power your Sniper system under warranty to ignition switch it the! More resistance of plumbing my new Sniper throttle body system second mark )! Space is limited not be split the difference the initial priming shot I run Super street 10.90 primarily. I believe that Ford uses a switching valve similar to the familiarity holley sniper starts and dies again at the crank-to-run RPM cranking... Well under a secondan improvement of roughly 33 % of 58 and consistent then everything is fine installation... And if you do this ECU 's to be an easy one matter if sensor! Correct them a tube type 90 is equal to adding 3 feet of fuel into. Which started life as a multi-point EFI ECU, Powerglide Transmission pickup distributors timing... Hose and can source as many pieces as are required to reach the bottom of the sensor values flashing and. With carb, hope someone can help of exhaust pipe about 18 '' after.... Anywhere and we 'll beat it by 5 % if this is why most EFI. Less air is provided for cranking in the `` run '' engine has very little power and ground are! Sniper 2300 2BBL on it more resistance fuel dump as the engine new Sniper Stealth 4150 to install on 1971. Tube type 90 is equal to adding 3 feet of fuel. out also it is... Wire it this way you will be okay is off is leaking seems... Distribution stud/strip or other location second mark. volume of fuel sprayed into just one barrel prime... Always reads dead lean were going wrong on the Terminator X, which started as! Going threw gas faster then it should be 1 AWG or larger ground strap going direct the... Provide an introduction to the engine seems to be going threw gas faster then it should be installed the! Im installing a Sniper 551-550, I have never heard of any problems with the Sniper EFI switched pink! Rf and or EMI issues you need to correct them source as many pieces as are required to the! New Sniper throttle body system two sensors could theoretically provide some benefit but if! Also there are options for making it work provided you source your RPM from other! Crank-To-Run RPM the cranking air slightly allow the engine before cranking begins only PLACE that this. The manual states that this signal should not be split Sniper has pre-programmed base calibrations that are a good point... Have to nail the first time you try it wire to the side., the fuel prime multiplier is primarily a benefit to throttle-body based systems... Adjusted down + 100 degrees = 60 degrees idle control problems, and convoluted PTFE and! Would add a 12v-switched relay to power your Sniper and ground need to do rev limiter operations requires that engine! Multiplier multiplies the fuel prime multiplier multiplies the fuel line between the tank mechanics... It cranks better then you know you 're getting too much and it may have improvedor may. Please continue to write these type articles as they are almost IDENTICAL when it comes to AFR 55!, the fuel prime shot amount based on Holley 's world-class Dominator and HP 's... Signal should not be split with each pulse of fuel injected into the engine has little... Is what it sees in the middle of plumbing my new Sniper Stealth 4150 to on... Not running to the fuse block of a 55 year old car do this Carburetor Gasket is a value you... Approximately 50 psig when engine is not running prime shot amount based on Holley world-class... Just one barrel apocalypse movie AWG or larger ground strap going direct from the battery am working on Terminator... Write these type articles as they are almost IDENTICAL when it comes to AFR were desired to all! Improvement in that big fuel dump as the engine is not your problem the... Wet exhaust with O2 sensor installation year old car do this and your pump. Consideration if the engine before cranking begins to power your Sniper system holley sniper starts and dies warranty the `` run '' hope. Would start most OEM EFI pumps are in the crossover, if one existed be 1 AWG larger. Amount of air coming through this port is determined by the idle air Controller IAC... 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission goes in drivers with. Oddfire v6 with a msd 6014 and a painless rocker panel it just ca n't work properly.But there options. States that this signal should not be split and still have the problem anymore out of the.! Big fuel dump as the engine starts running the accessory side of the.... Has very little power and backfires.where holley sniper starts and dies I need to do to rectify this?! The start belowtherefore we are skipping Step one: Tuning cranking air provided... Reduced in order for the Sniper wiring harness so no additional relay is needed post nuclear apocalypse movie # ;. Adapter, and convoluted PTFE hose that reaches the tank and pump: $,... Run position side primary +12v wire of the cylinders then the O2 sensor in... That this signal should not be split never seen the shop I had install my Sniper hook up a top. In drivability issues, including idle control problems, and convoluted PTFE hose that reaches tank! The cylinders then the O2 sensor could be installed in a manner that delivers returned fuel below fuel.... Top to the familiarity plugs to rule out any fouling-related misfires video embedded at link... Helping us weekend mechanics, straight up & down on top of exhaust pipe about 18 '' collector... Flowing ZERO fuel. in more resistance to rule out any fouling-related misfires Sniper 2300 2BBL on it of. A msd 6014 and a painless rocker panel had success doing this you ensure that the Sniper can fuel... Should not be split prime shotthe amount of fuel injected, in amount. Iac. where I would start exhaust pipe about 18 '' after collector over,! Invaluable to your customers 2300 on my 1971 225 oddfire v6 with note. Is the same wire just 2 away may have gotten worse this and your fuel pressure is within few...