Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. to zero, but I think you'll find that you will stall. When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. Already have a new sending unit for gauge, on the fence whether to add in tank or external fuel pump. Chris, this is going to be an easy one. Once started, it should have a slightly elevated initial idle, ramp down to a level appropriate to the ambient air temperature, and then continue to idle down to the target idle that youve established for the engine. I am in the middle of plumbing my new sniper throttle body system. Increase that to 15 to start. When a wide band sensor is (DAMAGED) it almost always reads dead lean. 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? If you have RF and or EMI issues you need to correct them. 3.) The clocking of the O2 sensor is not a go / no-go situation as far as the operation of the EFI system. The car is 31 years old with only 13 500 miles on it. It is going on a 1966 coronet with 1964 413 wedge. Just realize that you risk aerating the fuel a bit depending on how it enters the tank. Super helpful and knowledgeable. I have two questions at this time: 1. You do have a fuel pressure gauge, right? 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. The Coolant Temperature starts at 106% and decays to 100% at 160 degrees. Increased power at the plug gap improves the combustion process of the fuel mixture which in turn improves the efficiency of the engine and performance. What do I need to do to rectify this issue? I read where you need to disable the rev limit verification feature on a 6425 MSD box but was wondering if it's the same for my 6014 LS box? Installed my Sniper, went through the startup procedure. That is a good reason to install a fuel pressure sensor on the Super Sniper or Sniper Stealth. But I have never heard of anyone else who has had success doing this. Good point. I Had a holley sniper on this car with no issues whatsover. Read the instructions and Follow them. Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. You also need to properly phase the rotor. In most cases you just hit the key at that point and it's happy dance time. This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. Clicking, ticking and sucking sounds. The install went great but after all is said and done it will not go into closed loop learn mode at idle. (Plus, it's easy to do---see this article.) Beyond that you're going to have to get Holley tech support involved. Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. My fuel pump keeps running when the ignition is on but the motor is not. 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. Quick to respond and very knowledgeable. 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. No aftermarket EFI system should be without a way of confirming fuel pressure. Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. If I let it prime twice, it starts much faster. 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. But as long as you keep a copy of your original configuration settings I think you will be okay. It will work on three, two, or even one cylinder of exhaust, but with each reduction past four you increase the likelihood that you are not seeing a balanced mixture and that your closed loop correction is going to be inaccurate.The purpose of putting distance between the merge point and the O2 sensor itself is to ensure that the exhaust is mixed adequately. Thank you for your ongoing support. Like many others, EFI System Pro allowed me to dial a new Holley Sniper. Connect the output of the crank trigger to the purple-green wire pair on the Sniper, set the ignition type to CD box, and you're golden. 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. I won't buy anywhere else. I'm on the cusp of ordering the Sniper for my 74 Corvette, but curious about he battery hook-ups since the battery is behind the drivers seat. Yes, all warranty replacement and repair claims must be handled through the retailer from which you purchased the unit. No timing control. Find a lower price anywhere and we'll beat it by 5%! 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. 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. At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. Question is, do I just plug what was the return at the throttle body? Get a gauge. FAIL!! 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. Pin 30: To Battery Also, I have not made any adjustments other than playing with the fuel prime. Sometimes it would catch itself, other times it would stumble and run out of breath. In general, go the opposite direction you went to get the fuel prime percent right. :-). And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. This is a huge improvement over what we got initially. Not some generic piece as some have speculated. I just wanted to list out some things that you should be looking for if you find yourself stuck here. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? At the bottom you'll see AE vs TPS RoC Blanking. Therefor, -40 + 100 degrees = 60 degrees. While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? 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). Dont go in and hit the fuel prime percent, the cranking fuel, the acceleration enrichment graph, and the acceleration decay rate all at once. Like I said my sniper unit is running just fine and the car has never run better. :-) However, the self tuning feature may struggle with cams that have a lot of overlap. The process for the wiring is simple and it has been wired as per the directions and to what you have quoted to me above.In order for me to return the Sniper, what would the process be? Bolt-on carburetor style EFI for your classic car or truck. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. 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. Hello Chris. Much appreciated! 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. Super helpful and knowledgeable. There are just turn downs after the electric cut outs. You mentioned its use in # 9 of the top 10 Sniper EFI installation tips. The Ordering process was so easy and non-painful. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. If youre trying to decrease the starting time, or if your engine struggles just a bit when it does start, then increase these numbers significantlymaybe 1.5 times more than the default or up to the maximum of 100%-- and tune downward from there. 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. 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. It starts at one value and then ramps to enrichment based on a user-specified After-Start Decay Rate. Do you have issues with cold start that go away with warm start, or vice versa? 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. In most cases this is at the fuse block but in a few it is at the ignition switch itself. 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. You will still get a prime shot each time you key the system on but once you start cranking it will not deliver cranking fuel and should eventually clear itself of the flooded situation and fire. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. But I have MSD 6 AL. How efficient is your engine startup? You need a new fuel pump. Thanks. The fuel pump should turn off after 5 seconds until the motor is started. I figured it would be minimal. And the smell is just about gone. We do see a massive rich dip in the AFR as soon as engine starts. You may have a pinched injector signal wire that has the injector on permanently. There should be no relay added to this wire. 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. 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. I call this the Happy Dance moment. Im installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. A couple of questions to ask yourself: Remove the air cleaner and have someone key the system on while you look down the throttle bores. Excessive Fuel (Top Cause): Most often caused by the system adding fuel due to false readings resulting from incorrect sensor placement, cylinder misfires, exhaust leaks, overly rich tunes. Any suggestions ? Just recently installed the Xflow and my AFR is reading is 15 no matter what I do, engine is running ridiculously rich but the AFR is not changing at all is this an ECU problem or is there some things I can try doing before I pull it off and send it back to holley? Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. Can I use this for the return.Thanks for the help, For this I recommend the HyperSpark Distributor. My first rule: There has never been an engine that didnt start because EFI. 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. *Possible delays due to Covid-19 click for more information. Unless there are some sort of idiosyncrasies specific to the fuel system on the '88 Ford F150 of which I am unaware, this should work fine provided the factory pumps can provide enough fuel for the current engine. If your fuel pump primes when you turn the key to accessory its wired wrong. (Dont forget and then later wonder why it wont start!). Holley's Dominator and Changed the fused location of the wire to the ignition, instead of the radio. 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. Is this normal? As long as you're that far into the pipe (to prevent reversion from feeding air back into the O2 sensor) then I wouldn't worry just now about changing the settings.In general, I recommend not touching a thing until you've spent a significant amount of time driving under varying driving load and RPM conditions. Resistance results in heat and heat results in more resistance. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. 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. Then, realize that you have the ability to delay the point at which the enrichment starts by up to one second. It wont start! ) great but after all is said and done it will not go into closed learn... 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