I set the AFR at 13.5 and all is good now. Good luck! Both Sniper and trans controller grounds were direct to the battery ground, as they should be. Ive also used another snap on light to confirm. Yes it is controlling the timing and I had issues at first and it controlled the idle just fine. Some have suggested mis-setting sets the idle speed at 850 RPM but I suspect it is not a fixed number but rather a delta of about 300 RPM above the target. It has a lightweight centrifugal spring kit installed so I reach total timing around 2500 rpm. First, let me congratulate you on your patience in letting the system learn. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. The Sniper EFI remote IAC (Idle Air Control) and plug is designed to gain installation clearance on some Sniper EFI 2x4 installations. Learning to install these is great--you're about to embark on the next great adventure of advanced troubleshooting. I'd really appreciate some help. Honestly, I've never seen this happen but if the butterflies were misaligned on the shafts it could allow too much air to enter. School's out for spring break this week though so I'm covering for employees on vacation. Do I have to hook up sniper ac wire to relay or should iac pick up idle? Throttle Tip-In puts you in a part of the fuel map where you stay for only milliseconds at a time. If this is the case then I would look particularly close at the IAC hold position and IAC ramp start.Let us know what you find and what works for you! Watch videos on installation hints and if you haven't yet, download & read every Sniper installation guide you can find online. It will drop down to 400 RPM then climb 500 and then shoot to 900 and then come back sometimes two or three times then catch it self an idle just fine again. If I'm driving along and pull up to a light and leave it in gear it idles just fine but it seems not to be able to compensate if I put it in neutral and then back and drive. But, whether your vendor provides you with tech support or sends you to Holley, I'd start by getting them a data log and asking for some insight. 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. You can disable the idle spark control at the locations below. The window you saw in the image above pops up. Hello, I am having a tps and idle issue. I'm wonder if the iac can cause this. I will let you know what the results are. Reply Quote. After pumping the pedal a few times at different times it dropped to zero and started to work. After 50 on the throttle position I'm not sure if the whistle goes away or you just can't here it anymore. Running a bbc with coil - my timing is perfect. port that goes right on the inlet of your Sniper and makes installation a breeze.If your fuel pressure is solid at about 60 PSI then you should start looking at I certainly appreciate your frustration (as well as your wife's!) What should I be looking at to calm this down? I think I figured some of my problems outI'll try to explain. Cycling the power to the Sniper EFI would cure the problem, but not prevent it from coming back. The car cruises fine, and if I was to keep idle at 2000rpm the issue wont happen, its only when the car tries to ramp down to idle position.Thank you for your help, any advice would be appreciated.Thank you,Eric, Whenever we see the AFR go to "Heating" that is an indication that the ECU has been reset. It's hard to know what the previous owner did right versus wrong. Usually it wont stay on 0% very long and soon changes to another number like 1 or 2%. The fix? It's going to be really difficult to nail down the problem with the several simultaneous changes that you've made. Realize that when you drop the throttle, the engine enters a condition it will only see for a fraction of a second at a time. It'll start & run till it's warm, then when I try setting the IAC every time, I try getting it between the 2 & 8% it quits. When running it will only stay in closed loop and learn at idle. :-)Yes, learn impacts idle too, and remember the even when the basic learning is done there will continue to be some learning for changes in weather, altitude, etc.Go ahead and try a few idle settings and see how they impact the idle-speed searching. Yes, let me know how that setup process works. If you haven't installed a any advise would be appreciated. The first 250-300 miles were amazing as the Sniper EFI worked flawlessly. Thanks for the great question! IAC Pos.% = 0 lower until I turn down the set screw. These aren't generic newsletters either but instead personalized emails. Do please let us know what you find out! If i set the idle to 750, the only way i can get it there is to turn the idle screw all the way out but then its at 0 iac. We do that but most places don't. The learn percentage should gradually decrease to virtually nothing as the map plus learn table begin to get more and more accurate to your specific setup. Once it decides to come back down, it does so with no issue. Take a drive and stop somewhere for 30 minutes, CTS is 170 when engine was shutoff. Next, reach down into the secondaries and push the butterflies closed. I put sniper on in hopes to be able to just turn key and start without fumbling with pedal to keep it going and to correct idle drop when ac kicks on. Next, clean the IAC and all related parts with brake cleaner. If you find that the IAC is more than 8 percent, repeat this process and instead of shooting for 50 RPM below your target make it only 40 RPM below the target idle speed. To do this, open up the Initial Startup gauge screen that was used in section 17.0. The IAC going to 30 is normal. However, I did have another fellow who contacted me that claims he went through three units before he could get one that would talk between the ECU and the Monitor. It will learn the fueling eventually either way, it's just that one might get you there a little faster.If the idle is fine at start-up but then increases after you depress the throttle then you might need to lower your IAC Hold Position a bit. No timing control, coil negative ignition type. It will still change a bit with weather changes and when you get into infrequently-used sections of the map, but it's nothing to worry about.Regarding your idle speed immediately after start-up, that is determined by your Idle Parked Position. The team at EFI pro are some of the best I have ever dealt with when coming to ordering parts or having the knowledge to answer any question you may have. You can manually set it 57 after you run the Wizard if required. Get that thing installed and you're going to know a whole lot more about what's going on. The learn function will offset the base fuel table until the closed-loop compensation only requires minimal changes. As I have it set right now, my idle at park is in the high 700s and my desired idle in gear is set at about 700 cold (80 degrees) and gradually lowers to 590 once engine temp reaches 160 degrees. They also worked with me on a sale I missed and price matched those parts. The problem I'm having is I cant get the IAC to drop down off 100%. I believe because the TPS is not registering. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. If the connection is loose it will cause the system to shut fuel off because the signal telling the EFI the motor is turning stops (to prevent excess fuel from being dumped in the motor). My dad wanted to recheck the timing so I set the Static Timing at 15 and it runs perfect. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. $107.95. Could the IAC be broken/malfunctioning? Do I need to try taping up the IAC port and setting the idle off the idle screw? Have you ever experienced a high idle once the engine reaches 200 degrees?Ive set my idle the way you said and it works great until the engine reaches 200 degrees. In that case, and if you have an EGR valve, I might be suspicious of something going on there. I' m going to put the 3 rd new pump this coming friday. I have an entirely separate article on Solving RF Intereference Issues. It is how the engineers allow you to clear a flood condition when you detect it. That's what you're seeing. 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. 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. Have you confirmed your fuel pressure at idle is 60 PSI? If there is an issue with using the Sniper EFI TPS signal, is there a remote TPS or an adaptor for the Sniper EFI that allows the TPS signal to be accessed for the transmission. idle counts from 0. Give it a watch: https://youtu.be/7SO7-tZn6iw. have the system learn the higher speeds? Jun 12, 2021. The tps will not auto reset to zero. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. :-) Just don't let the parts go flying. My problem with the sniper is the whistling and hard throttle pedal, I have a 700r tranny with a kick down cable. And, while that is happening, make a note of the temperature before you engage the starter, and then the rpm when it starts.The Idle Parked Position is set on a temperature-based graph like the Idle Speed Curve. The Fuel Base map is perfect, the car works well, runs well, running through the streets, the car is great. I do know that the reference angle is 57.5, the inductive delay says 100.0. View Holley Sniper EFI Self-Tuning Kit - Shiny Finish. This item: Holley - 543-105 EFI Idle Air Control Motor , Black $71.72 Holley Sniper EFI 870001 Throttle Position Sensor $34.60 Holley 860004-1 92MM Sniper Throttle BDY $223.93 Customers who viewed this item also viewed Page 1 of 1 Start over Holley EFI Idle Air Control (Iac) Valve Motor 30 13 offers from $79.56 As soon as I got the new one installed and wiredit fired right up and did everything it was suppose to do with no issues. So, this is what it takes to put a Sniper on a small-block Ford. I think you will find that it will learn its way through this. We'll also be contacting you for future purchases now that I've discovered you! The noise is definitely coming OUT of the throttle body. But now that Terminator X is available, I highly recommend going that route. Duty Cycle% = 3 That is what I really respect about Holley. He is able to get it to start by quickly depressing the accelerator to at least 60% and releasing. My primary reason for going EFI was drive-ability, (Startup and take off without waiting for the engine to warm up) and not have the occasional hesitation a carburetor has especially just barely opening the secondaries. I would suggest you take a look at that if you haven't already. I got it home, checked it all over, everything is hooked up correctly. I had HIGH Idle issue and fixing this curve FIXED the ISSUE --- THANK YOUCan you explain what "Current Learn % means, after finally fixing the idle problem this % jump from -1 to -30% in about 5 minutes at idle with CTS @ about 170.Also when starting the car at hot the engine goes to about 2300+ RPM for a few seconds then crashes down to my Hot idle speed of 950 -- bounces a little and then smooths out. While confirming, in the handheld ensure that the Reference Angle is set to 57.5 and that the Inductive Delay is set to 100. Give them a call and if they are unable to provide customer support the contact the Holley tech support line at 1-866-464-6553. We will definitely be sticking with Holley from here on out for future retro-fits. I would recommend that you call first thing in the morning, as they tend to get quite busy during the day and wait times can get long. I have one customer who is having some similar issues and his AFR is down at 9.6:1 when it won't start. Two months fighting, cursing, not getting any help from Holley OR the forum, and a stupid little tin plate. I'll give the ". Perfectif you have the original synchronous linkage. Super helpful and knowledgeable. There is no sense proceeding until your TPS is at zero at key-on. Hello Chris. And Earl's makes a fantastic little 100 PSI gauge. I straightened that out, got it running and that's where it goes downhill. We offer some tips to help with that. No problems with either cold or hot starts. These are "transitional" cells, and you really have to make the effort to learn in these areas of the map. Reducing that a bit will help. Just add 5 or 10 degrees of advance and see if it doesn't idle better. When you open your IAC to 30% you are naturally going to have a high idle condition. Bryan McTaggart 02/28/2023 news If the engine idles at 750 RPM with the throttle plates all the way closed and the IAC at zero then there is some sort of an issue. If your fuel pressure regulator has failed (and they often fail by blocking return fuel and maxing your fuel pressure) then it could lead to rich idle, particularly until your engine gets up to temp. is the fuel pressure. Sometimes an engine can produce enough vacuum to pull the secondaries open slightly. Sniper is still learning so it will continue to improve.Second, you may have heard the phrase, "correlation is not causation." Have you checked your fuel filter and made sure it's not plugged?If both of these are okay you're going to have to find a way to monitor your fuel pressure while under load. Anyway I have a 327 sbc in a 1987 Monte SS with a T5 5 speed and 3:73 posi rear. So the issue Im having is low idle. Hi Chris. You'll be amazed at how much of this just "goes away" when you drive it enough. Also, I was seriously rich at idleso rich it hurt your eyes. Laptop Access A couple of possibilities that come to mind in order of likelihood: Im having an issue with what I think is the Iac. However I do have a couple of issues I hope you can help me resolve. That's not the IAC Hold Position, it's a percentage value. This page was generated at 12:25 AM. Its timed to 36 degrees. However, I have never found that to be the case. Incorrect connections will result in excessive resistance. Also what would you say a desired idle should be for a 3 speed automatic ford? Sorry for all the questions, new to the efi world. have noticed on the hand held is that Air/fuel Ratio rises to 20 +/- A/F and the The following are status commands and diagnostics for sensor and various parameters in the Holley software. issue. You may have to register before you can post: click the register link above to proceed. The symptoms I had was a low cold start idle and going lean coming to a stop. If you have any questions about the car/setup let me know. Find a lower price anywhere and we'll beat it by 5%! As inconvenient as it might seem, I'd recommend keeping a timing light handy and checking your timing during the high idle condition and then again after restarting. Strangely, what I've seen is that it idles too lean as the injectors are effectively shut off.Thanks again for the follow-up and glad to hear that everything is working well now. Yes, it will talk to you--but not with words. Hello Chris. This will go a long way to improving your fuel map without manually adjusting the acceleration enrichment. What would cause the idle to faulter like that? The headache is the Acceleration Enrichment. That's a nice change of pace--a low idle issue! holley efi. I installed Holley Sniper on three other Mavericks here in Brazil and the problem also exists.I did not make any changes to the parameters, only on Target AFR and the correction on the Idle Speed Curve chart. You can find those settings here: Handheld: Tuning > Advanced > Advanced Idle > Rampdown, Software: Idle > IAC Settings > IAC Ramp Down. You mentioned going from 13.5 to 14.2 but you'd want to go in the other direction--maybe to 13.2. So, clearly, the "No" answer is wrong. Hang in there--you can do it. I would gladly engage with you to solve this but ultimately you are going to need to go through whomever you purchased the system if a warranty return is in order.