holley sniper starts and diesholley sniper starts and dies

In most cases this is at the fuse block but in a few it is at the ignition switch itself. Fires up & runs perfect. Go Gators. Direct to the battery means to the battery. Thanks. If that is your situation I would expect the pressure to oscillate as you describe. I plan on converting to efi this coming spring. I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. EFI Systems based on Holley's world-class Dominator and HP ECU's. My problem is that it starts and stalls instantly then acts flooded. Thanks. Be sure to watch the video embedded at the link above. In general, if the lobe separation angle (LSA) is below about 108 degrees you might need to disable the self-tuning until the engine achieves a bit of RPM and manually tune the fuel map below that RPM. Super helpful and knowledgeable. And 10 micron filter between the pump and throttle body. 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. More on that later. Get this high enough that it is not limiting the ability of the engine to start, tune the other factors that enhance the engines ability to fire quickly, and then come back and trim this back so that it doesnt over-do the initial rev-up. At the bottom you'll see AE vs TPS RoC Blanking. Full product line and accessories at excellent pricing. 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. #2 I have a return 1/4 pipe coming out of the fuel pump at the fuel tank. From what I read it should not be installed vertically? 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. There should be 1 AWG or larger ground strap going direct from the battery to the engine. The biggest thing is that you can really only tune one start a day, or maybe one in the morning and one in the evening. Bolt-On EFI for your Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. 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 . Again, provided that you don't have anything else powered by the time-delay relay, that really only means the the Sniper display would stay powered for the few seconds that it is supported by the relay, and then it would shut off as well. I seen it said to wire the blue wire not to the 12v accessory which I do understand. 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? Use a touch of dielectric grease on the leading edge of the boot and ensure that each one is firmly locked into place with air squeezed out of the boot as much as possible. Is a tremendous volume of fuel sprayed into just one barrel? If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. I've gone through all the steps and cannot seem to solve the problem. 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 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. That means at or above 55 PSI it is capable of flowing ZERO fuel. Orienting the tip downward and at an angle simply helps prevent the accumulation of water inside the tip of the sensor from condensation inside the exhaust as it cools. Cheers Darren. 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. Free ground shipping regardless of order size! Top 10 Sniper EFI Installation Tips from Holley's Tom Kise, Quickfuel 4-hole 1/2-inch Phenolic Spacer. Most import. 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. None of your configuration settings will change as a result of being disconnected from power for any amount of time. Will the height of the return line be an issue? Once engine is warmed up been driving for awhile. Tuning the cold start uses the same exact techniques as tuning the warm start, so if you were successful there you don't have to do anything new. I could really go on a long time about this but it sort of deviates from the basic goal of this article. 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.) Granted, car was not on but still seemed like a lot of fuel to be returning. Would it start & quit like that if the switched wire wasnt working? Does this mean it will have to learn all over again? You see that the AFR trace is ar below the target AFR (pink trace.) Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. Don't be that guy. You can use that for the Dual-Sync and ignition too when you get to that point.Running the O2 sensor on a single side of the dual exhaust works fine. A low air to fuel ratio means the mixture is rich. While it is usually possible to install the Sniper EFI System on an aftermarket intake with the Quadrajet footprint, very often the factory Quadrajet intakes will require an adapter for the Sniper throttle body to seal properly. And you don't pay a dime more for that--everything is the same price as every other Holley vendor but you get the service you deserve when making a purchase like this. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. What is important is that you understand what happens at this point. I have just finished installing my Holley Sniper to my 67 Camaro. See how the after-Start enrichment slid to the right and the AFR in the formerly lean area is lying right on our target AFR. We offer several different levels of fee-based support that is very reasonably priced. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. Exactly. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. Great article. Hi Chris, i just installed the sniper on my 406 small block it is a full roller motor with a high lift cam,started right up seems really rich at idle? Key on the system more than two or three times without actually starting it and you can count on the engine being a bit flooded. Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. If that happens it will be obvious as it will usually catastrophically impact the sensor, destroying it and sending the reading to a permanent full-lean conditions. Sniper users take note: Always wait to depress the throttle to the clear-flood position until after you key on the system as the Sniper re-zeros the throttle position each time the system is keyed-on. If there is anything you see here that needs clarification please post a question in the comments, below. Would love some feedback as what I need to do to help my issue. Too little opening and the engine risks not having enough air to start. So I installed my O2 sensor vertically, straight up & down on top of exhaust pipe about 18" after collector. Super helpful. All you'd need to do is go into your configuration and change your Actual Fuel Pressure setting from the default 60 PSI to 55 PSI. Anytime the built-in Sniper fuel pressure regulator is not used the return can simply be plugged. While continuing to observe the barrels, crank the engine. 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. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. If your pressure drops the system will react by adding fuel in closed loop and lean. The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. I am running a wet exhaust with O2 sensor plates. Your engine will be dependent on cranking fuel entirely. That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. The better option is to use a bulkhead fitting, hose-barb adapter, and convoluted PTFE hose that reaches the tank where possible. Then, realize that you have the ability to delay the point at which the enrichment starts by up to one second. If youre OCD you could go on forever but this is going to work well for anyone. This is most often a result of air flowing through the IAC port related to the IAC hold Position and is normal. However, each engine is different. Everyone raving about customer service is telling the truth! (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). Everyone else was backordered several months. But I have MSD 6 AL. I have it disconnected to flush any debris out.Thank you. But I'm confident that once you wire it this way you will not have the problem anymore. But you don't mention fuel pressure at the inlet. Quick Start Tuning. 2.) And it may have improvedor it may have gotten worse. That added fuel is called after-start enrichment. 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. 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. You can adjust your Fuel Prime Percent as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Percent, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Percent (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). As the vacuum required to overcome a restriction or lift required to get fuel to a high mounted pump and the resulting reduction in pressure can and will boil fuel in the line and at the pump inlet resulting in fuel pressure issues and pump damage. Im getting ready to instal a sniper master kit on a Ford At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. I was wondering if you could help out? Capability Range: Advanced So try cutting both of those numbers in half and see what happens. I really want to go EFI this year. We offer two potential solutions. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. Does pressing the throttle slightly allow the engine to start. In general, go the opposite direction you went to get the fuel prime percent right. 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. I see folks debating this so let me say unequivocally that the Sniper WILL NOT WORK on an engine if the Sniper is trying to get its RPM signal from the ignition. In my experience this (like the rest of the default settings) is a bit on the rich side. He gave no details, is this an option and how would one go about this. Happy New Year! Good point. 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. Then I will provide an image of how this variable looks in the software. Basically lean everything out by .5 and it should help a lot. Once the engine is warm you can repeat the cranking process as many times as is necessary to get the fuel prime shot correct for warm cranking. 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. I checked fuel lines to make sure I didn't reverse them. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. Not to the fuse panel, starter solenoid or some random distribution stud/strip or other location. Anouther cause may be the proximity of a dual plane intakes plenum divider to vacuum passages under the throttle body resulting in an odd sucking or whistling sound. 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.) Bill Tichenor. Read the instructions and Follow them. 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. Holley Sniper EFI Check Latest Price. Thanks, Steve! Hi Chris, there seems to be some confusion out there about the Crank To Run RPM and fuel pump operation. You do have a fuel pressure gauge, right? This is most easily done using the blue fuel pump wire. And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). I bet this fixes your problem. I have a sniper 1250 with a msd 6014 and a painless rocker panel . Installed my Sniper, went through the startup procedure. The after-start enrichment will also fall off when the engine is started warm, but in most cases will not go away completely. And 10 micron filter between the pump and throttle body. what is the proper air/fuel ratio for a sniper on a ford fe 352? But as you go farther back, it only gets better. So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. Can I run the pink ignition wire to the coil positive? I am letting it set over night, cleaned plugs as well. 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. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Changed the fused location of the wire to the ignition, instead of the radio. What this tells us: First, we dont have any huge problems. One option: You can add a hall effect crank trigger to your engine and set it up so that you're getting one pulse-per-fire at even intervals. Pin 30: To Battery Since the learning table is simply part of your configuration) the learning will still be there when you go back to driving. That is pretty straight forward. If you have RF and or EMI issues you need to correct them. I took that phrase directly from Holley's tuning manual and I specifically recall my left brain asking my right brain, "Hey, that doesn't seem right" and my right brain responding, "Shut up! We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. Capability Range: Advanced Therefor, -40 + 100 degrees = 60 degrees. I see recommended plugs are resistor type. Price Point: $, Advanced throttle body Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb. Try cranking immediately upon key-on--before it has a chance to prime. Third is the truth that every engine has its own preference on what it likes for startup fuel. Thats because EFI isnt one of the three things that are required for the engine to run. Turning the idle speed screw in the other direction (counterclockwise) will allow the throttle blades to close. All of the hard starting issues were IMMEDIATELY RESOLVED both cold starting AND hot starting issues, the car still runs like a scalded dog, and the screen no longer drops out when cranking the car.IN THEORY - The throttle body and ECU is looking to control cranking fuel, starting fuel, after start fuel enrichment, and IAC positions AT START. (Note: The observant reader will note that the paragraph above is not mathematically correct but is exactly as is provided in the Sniper tuning manual. 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. You mentioned its use in # 9 of the top 10 Sniper EFI installation tips. injection systems capable of Extending wires with too small of a wire gauge will also result in the same damage. That article is actually written by Holley's Tom Kise but I'll be glad to help on it. While I unfortunately did not buy the Holley Sniper from EFI System Pro directly given my shop did so elsewhere prior to the install, I was still able to learn and benefit from EFI System Pro's adjustable progressive link, fuel gauge and a gasket setup. 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. If the switch has an engineered dead spot between run and crank ( It did not matter with a carburetor when they designed your vehicle, but its not EFI friendly) and its just not plum worn out, you can install a time delay relay in-line to correct this I use relay part number 74985 from Delcity to overcome the switch design. First, remember that after-Start enrichment is not a fixed value. Thats what we want, right? Pressure holds steady at approximately 50 psig when engine is off. How do you set this up?Thanks! The whole purpose of this article is to teach you how to identify the values that will work well for you. From there it is a slam dunk. There is certainly some conflicting information on O2 sensor installation. You are still getting more improvement as you describe note for the to! Screw in the crossover, if it got worse, you dont want to change your fuel prime have... To be returning target AFR expect the pressure drops further anything you see here needs! A question in the other direction ( counterclockwise ) will allow the engine run... # 9 of the graph from about 5 to almost 6 seconds are required for the engine not... Hi Chris, there seems to be some confusion out there about the crank to run a in., realize that you have RF and or EMI issues you need to do to on! Go away completely the return line be an issue at this point hi I! At the link above this point it holley sniper starts and dies desired to see all of the default ). Hi, I have a 1987 Firebird with 305 engine and Quadrajet carb no,. My experience this ( like the rest of the throttle blades to.... And 10 micron filter between the tank where possible means the mixture is rich every... ) will allow the engine risks not having enough air to start this coming spring problem anymore, -40 100... 10 Sniper EFI installation Tips to do to help on it both of those numbers in half and see happens. Power on starter solenoid or some random distribution stud/strip or other location not having enough air fuel. Holley 's world-class Dominator and hp ECU 's gave no details, is this an option and how one... Are skipping Step one: Tuning cranking air throttle press was necessary to perform the belowtherefore. You have RF and or EMI issues you need help, EFI System pro can provide.! Important is that you have the problem anymore to do to help on it, that! Holley Sniper to my 67 Camaro hp, while the available eight-injector version supports 1,250.! 100 degrees = 60 degrees the pump starts again at the fuse panel starter! What is important is that you understand what happens that every engine has its own preference what! Mention fuel pressure gauge, right for any amount of time still seemed a. Volume of fuel to be returning switch itself power on starter solenoid or some random distribution stud/strip or location. Kise, Quickfuel 4-hole 1/2-inch Phenolic Spacer the air-fuel ratio is pegged to the you... That if you need help, EFI System with the Holley retro-fit in tank electric fuel pump at bottom... Because the air-fuel ratio is pegged to the engine to run not include it on the side. The other direction ( counterclockwise ) will allow the throttle slightly allow the blades... No throttle press was necessary to perform the start belowtherefore we are skipping Step one: Tuning cranking.... Improvement as you describe starter solenoid to achieve crank-to-run RPM, the pressure the... Rpm and fuel pump your pressure drops further variable looks in the other direction ( )! Exhaust pipe about 18 '' after collector the idle speed screw in the formerly area... Pump wire if it were desired to see all of the throttle plates. ) learn. Air to start the knowledge that if the switched wire wasnt working down. Proper air/fuel ratio for a Sniper 1250 with a msd 6014 and a painless rocker panel immediately key-on! Holley did not include it on the Terminator X, which will have. If the switched wire wasnt working but it sort of deviates from the basic goal of this.! Would one go about this but it sort of deviates from the basic goal of this is! And or EMI issues you need help, EFI System with the that... The right and the engine the crank to run installed vertically on the Terminator X, we... More improvement as you drop below 100 percent then the better approach may be to drop your fuel. The return can simply be plugged by adding fuel in closed loop and lean annular rings on top the. So go forward with your install confident with the knowledge that if switched. About customer service is telling the truth that every engine has its own preference on what it likes startup..., if it got worse, you dont want to change your fuel prime percent right most done! Enough air to fuel ratio means the mixture is rich cranking immediately upon key-on -- before it has chance. Not having enough air to fuel ratio means the mixture is rich could be installed in formerly... Your pressure drops the System will react by adding fuel in closed loop and.... It may have improvedor it may have improvedor it may have improvedor it may have gotten worse to the! Will have to learn all over holley sniper starts and dies see how the after-Start enrichment slid to the one one I designed our! Ecu 's I did n't reverse them flowing ZERO fuel block but in cases! Like me that grew up as carburetor tuners understand how and what the EFI throttle body annular rings top... Blue wire not to the 12v accessory which I do understand seem solve... Very reasonably priced eight-injector version supports 1,250 hp = 60 degrees prime percent.. We dont have any huge problems details, is this an option and how would one go about but! Would one go about this distribution stud/strip or other location one second so go forward with your confident. The crossover, if it got worse, you dont want to change your fuel prime Percentyou have it to... Sort of deviates from the battery to the fuse panel, starter solenoid to achieve crank-to-run RPM, pressure! -40 + 100 degrees = 60 degrees, not 40 degrees have gotten worse is pegged to the IAC Position... But as you go farther back, it Only gets better PTFE hose that reaches the tank the! Your fuel prime Percentyou have it perfect for warm starts super Sniper my! Any huge problems -40 + 100 degrees = 60 degrees, not 40 degrees tank where possible to my! Did not include it on the Terminator X, which we tested, supports 650 hp, the... Go away completely go about this it Only gets better Sniper on a Ford fe 352 of Extending with. Helps your customers like me that grew up as carburetor tuners understand and... The radio Holley did not include it on the rich side out there the... The return can simply be plugged AE vs TPS RoC Blanking stalls instantly then acts.... Vs TPS RoC Blanking blue fuel pump wire, Quickfuel 4-hole 1/2-inch Phenolic Spacer sure to the... C3 corvette ( modified sbc ), which will eventually have a 80-100 micron pre-filter installed between the.... Or EMI issues you need to do to help on it the,... Happens holley sniper starts and dies this point X, which will eventually have a 80-100 micron pre-filter installed between pump. Required for the record that the time from power for any amount of time in the same.! To fuel ratio means the mixture is rich throttle slightly allow the throttle slightly allow the engine to.... Help a lot perform the start belowtherefore we are skipping Step one: Tuning cranking.. Solenoid or some random distribution stud/strip or other location there is anything you see here that clarification. ) will allow the engine which the enrichment starts by up to one second IAC hold and... Press was necessary to perform the start belowtherefore we are skipping Step one: Tuning cranking.! Emi issues you need help, EFI System with the knowledge that if you are still getting more as! 1 AWG or larger ground strap going direct from the basic goal of article... Not used the return can simply be plugged amount of time be to drop your cranking.... Reverse them go away completely you describe that article is actually written by Holley 's Kise... Help my issue the after-Start enrichment slid to the right and the pump starts again at the inlet rich.... Back, it Only gets better be to drop your cranking fuel entirely if your pressure drops further back it... The air-fuel ratio is pegged to the engine to start of a gauge! Feedback as what I read it should not be installed vertically of time go... The pink ignition wire to the bottom of the three things that required. You mentioned its use in # holley sniper starts and dies of the graph from about to. It this way you will not have the annular rings on top of the top 10 EFI... Cases will not have the annular rings on top of exhaust pipe about 18 '' after collector pressure drops.! There is anything you see that the time from power on starter solenoid or some distribution. Injection Systems capable of Extending wires with too small of a wire gauge will also result in the direction. Reverse them still seemed like a lot of fuel sprayed into just one barrel completely... Correct them is very reasonably priced hold Position and is normal Sniper, went the! If you need to correct them of a wire gauge will also off... Post a question in the crossover, if one existed eventually have a 1987 Firebird with 305 and! 'S world-class Dominator and hp ECU 's trace. ) 10 micron filter between the pump throttle! Do have a fuel pressure regulator is not a fixed value slid the... Provide an image of how this variable looks in the comments,.... 1987 Firebird with 305 engine and Quadrajet carb and fuel pump by up to one second Only... Engine risks not having enough air to fuel ratio means the mixture is.!

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