It’s on a big block Mopar with stock electronic ignition . So check that timing and I think that you're going to find you need a good bit of advance. Handheld shows plenty of fuel so I dought it's an issue there. Wish I knew about it before I made my purchase. I can drive it a bit but pops through the throttle body when pulling out from a stop (4 speed) and sometimes in the exhaust out on the road. If you've been running a filter then you have to wonder if you have a legitimate Walbro pump.If you install a new pump and the noise is still coming from the Sniper EFI System then only the dealer who sold you your system can help you. and bolts. mail today. You can find those settings here: Handheld: Tuning > Advanced > Advanced Idle > Rampdown, Software: Idle > IAC Settings > IAC Ramp Down. It is probably that your RPM above the maximum point at which ramp-down can occur. The Sniper ECU can use the timing to help maintain the idle speed and that will definitely be useful in that transition from Park/Neutral to Drive.If you don't have ECU-controlled timing, or if you do and it's not fully compensating, it may be necessary to increase your target idle slightly. Nothing against Holley's method but I need to keep things simple and I do that by eliminating the effect of the IAC entirely while getting the idle speed adjusted. Holley EFI Electronic Fuel Pressure Gauge. It started right up and we did your idle control fix and all is good at idle. If your fuel pressure is at or about 60 PSI then visually inspect the barrels of the throttle body while having someone key on the Sniper. Yes, let me know how that setup process works. If I put the truck in neutral the TPMS will raise all the way up over 2000. Once you have done this the challenge is to create a datalog that includes the ":snap" you describe. :-). This software is going to allow you to open both the configuration file and the datalogs that you create, overlay them and you can get a much better idea of what is happening. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. They are prone to be inaccurate. I notice at 2-3% tps the iac is 18-25% and it stumbles, when the iac gets to my hold position of 30 it stops. Given the circumstances I would say that it is either the IAC motor itself or RFI but you seem to have ruled both of those out. In fact, it is those users who seem to end up most impressed with the system. Very Quick Shipping & Help Guides Have Been Invaluable For Setting Up My Holley Sniper. It is a common one. I have it set at 650 and it idles anywhere from 590 to 700. ULTRA4 is the run-what-you-bring, no-holds-barred class that started King of the Hammers. Price Point: $$$. Another suggestion is to add an extra turn to the spring built into the linkage to increase the closing force on the throttle shaft. I've read that a spacer with 4 individual holes will solve this, but after I installed the progressive linkage the noise went away!! I can have it working fine (5% to 10% at target idle at operating temp.) Pink Wire must be attached to a 12V+ switched source that has voltage during cranking and run positions of the ignition switch. Those little 1/8 NPT gauges are pretty inexpensive and generally pretty easy to find locally.If you confirm that the pressure is indeed 90 PSI you could pull the fuel pressure regulator apart and check it. Ignition parts - with EFI you need to run resistor plugs and resistor, non-solid core wires. The window you saw in the image above pops up. Since that has long been corrected we have moved that information to the bottom of the article.). Interesting question. Enjoy! No power at the programmer and no fuel pump running. If the regulator is working correctly and there is no restriction in the return line that should make no difference however.Sorry I didn't see this on the Holley forum. If you are idling at 2100 RPM (based on a default IAC Hold position of 30%) and your target idle speed is 900, then the ECU is not going to try to idle down. Kind of cuts into forum time. There are six different acceleration enrichment tables that you can tweak and that may be the way to go. Clearly, something is changing. So try changing your IAC hold value slightly:Tuning : Advanced : Adv. Switch power to the Sniper on and crank the engine. P.S. *Possible delays due to Covid-19 click for more information. Just add 5 or 10 degrees of advance and see if it doesn't idle better. The solution is to either lower the IAC hold position or increase the RPM above idle to start ramp (default is 1000 RPM). Shut off car/restart and it's back to idle at I went on the good ole interweb and found your website which was VERY helpful! Also in Tools, Shop Equipment & Chemicals -, Footage taken from Holley Carburetor Installation & Tuning DVD. That's what you're seeing. Then your low idle problem will go away. While adjusting the screw if the TPS position reads begins to read higher than 0% cycling the ignition switch will recalibrate the TPS back to zero. Good Several good bits here. Holley just brought EFI within range - introducing Sniper EFI! Also its extremely rich at idle. At that point the tps is pretty high, then shut the ignition off, pull the tape restart the engine and idle goes into hold mode and idle is through the roof. Interesting situation you have. We'll also be contacting you for future purchases now that I've discovered you! We're having trouble with a Ford Maverick 302 V8, using ethanol. Once you so this, and after you have your CAN-to-USB harness attached to your laptop with the Sniper software, you can see precisely the cells where the system is operating when the bog occurs. It will need to see it again and again. Its just at low speeds, not sure if its loading up or leaning out. issue. First, recognize that the amount below your target where you set the hard idle will be different on different engines. ... then you have already displayed about half of the technical skills needed to install the new Sniper EFI system from Holley. Can the return line be an issue?I have had 2 faulty gpa-4 255 walbro pumps go bad. After manually making the sensor go through the full range a few times, I reinstalled it and now my TP will read anywhere from 0% to 4% when I key on. I'd say make sure you buy from someone who can give you good after-purchase help (hint!) I have seen this become blocked with debris / dirt in the fuel system and cause a high fuel pressure condition . Should it not do the opposite and do this on a cold start not warm. I also tried changing roc/map to 8 from 15 again no change at all.My ve table is smooth and tuned I even changed my AFR to 13.5 from 14.2 and no change at all. Fortunately, I have an article that goes into this in some detail. I certainly appreciate your frustration (as well as your wife's!) I think you'll be all set! From here...the cycle continues and I am :-). It may take a few tries. I'm new to the efi thing and any help would be seriously appreciated. Properly configured, the Sniper does a fantastic job of responding to the transition from Park to Drive. Bolt-on carburetor style EFI for your classic car or truck. Am I missing something. It's pretty hard to get the header tubes glowing at idle with a lean AFR. Chris was kind enough to answer his phone evenings and weekends to help me through some minor issues I was having. Do I have to hook up sniper ac wire to relay or should iac pick up idle? the gas it catches itself and runs fine at slower speeds. That work continues today through Holley’s market-leading EFI products as well as through Holley’s family of best-in-industry brands. First, let me congratulate you on your patience in letting the system learn. The first thing I'd do is check your fuel pressure with a gauge like this. Remember that as an EFI System Pro customer you have access to me at any time via my cell phone. It is how the engineers allow you to clear a flood condition when you detect it. Since the load is more of a wave that increases the most initially and then decreases again, the ECU is doing really well to get the idle under control in only two or three over/under shots as you describe.You don't mention if you have your Sniper ECU controlling timing. back to trying to zero down an idle. Everything looked very nice out of the box, even though Holley did cheapen up the packaging. Unit primes pump, cranks & injects cranking fuel, engine fires and then dies, no run fuel is being injected after initial start. Which means you either need to increase that number or increase the ramp decay time. Also what would you say a desired idle should be for a 3 speed automatic ford? It’s timed to 36 degrees.
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