Does anyone have photos of this additional return spring they installed? P.S. idle counts from 0. And increasing your idle via the idle screw was also a good idea, because that will lower your amount of IAC that is necessary to keep your engine at the target idle speed. The last pic is with the car in Drive. The first thing I'd do is check your fuel pressure with a gauge like this. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. 30 minutes later CTS reads 161, start engine Idle is jumping from 450 (almost stall) to 1500, IAC is jumping all over 10 90. Hi I wish I had bought from you but I didn't find this site until now. Idle was back to normal but iac was at 0. Also if I give it a I have seen this become blocked with debris / dirt in the fuel system and cause a high fuel pressure condition . If you use your handheld to go here: Running new vintage air system so the is only a single power wire to compressor thats why I asked if I needed to run input wire to ac relay or if iac would pick it up fast enough(which its not). The IAC should display a 2-8% to bring the idle up to the actual target. itself out and hold idleeventually stalling. Ensure there isn't a vacuum leak causing the IAC Position to drop to 0%. 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. View Holley Sniper EFI Self-Tuning Kit - Shiny Finish. I asked him a million questions and waited a long time to save up before purchasing the system and I have asked a lot of questions throughout the installation process. I'll bet you find that you can get it working great without any manual tuning. If you are using your Sniper EFI System to control timing, navigate to Tuning > Advanced > Advanced Idle > Idle Spark and ensure that the Idle Spark Enabled is set to Disabled. I have checked the pink wire and it is at .001 volts when key is off. Copyright 2022 Holley Performance Products, Inc. All right reserved. When I covered the IAC with my finger, the RPM dropped so low it stalled. Chris's Idle Speed Adjustment Instructions*: *Note: If you are using your Sniper to control ignition timing then I recommend that before you start this process you disable idle spark control If you are trying to do this while the ECU is simultaneously trying to bring your idle under control by adjusting the advance it is going to be counter-productive. I also noted that after some time, I could change those values as I saw fit. Take a drive and stop somewhere for 30 minutes, CTS is 170 when engine was shutoff. Again, I would lean on that solution to let the vehicle drive/learn before you try to "fix" anything. If I cruise down the road at lets say 60 mph and lay into it, she will take off and go. But if you can datalog the bog you can know much more precisely what is happening. Hey Tommy, we've got at least one thing in common. Should i adjust idle screw with the fans already on? Hello Chris. I will turn it up some. The on board fuel pressure regulator in the Sniper throttle body has a small filter clipped over one end . Any ideas here? If this is the case then some adjustment of the linkage or the butterfly plates themselves is necessary. Yes its at 95lbs, needless to say he promised a new regulator would be in the Bolt-on carburetor style EFI for your classic car or truck. Definitely would have went with you guys. When I turn it off and try to restart it just cranks. I'm new to EFI and have no idea what to try next. Holley Sniper review - The good, the bad, and learn from my - StangNet If you go too low then it may stumble or even stall when coming off of throttle. This will tell us if the ECU thinks that it is in control of setting the idle or if it thinks that you are driving the engine speed with the pedal. Engine warms up to 195 degrees and stays. I will a, Scott has been very helpful and informative on guiding me through the purchasing and installation of my terminator X max system. Across the board, all of our customers say how impressed they were that it started and ran right out of the box just by following the simple installation instructions. Due to when the pump i'm using now makes a loud howling noise when it gets ran for awhile and it gets at a 1/4 tank of fuel or less. I'd say make sure you buy from someone who can give you good after-purchase help (hint!) Featured Products Sniper EFI $7.07 - $2,457.95 470 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation They tell you to ask call Holley. Since it is unlikely that anything else changed it is most likely the IAC is problematic or the butterflies are not shut all the way. The only other thing I changed was accel enrich but whatever way I go doesn't seem to change anything unless I change it drastically. I set it exactly like the instructions said and my iac is not only all over the place but when I finally did get it to the 2-10 range it's highlighted in red. When I turn the key on I can hear it prime, but I don't think im getting enough fuel. Try it! I ask because I'm using a PCV valve with my Sniper and have random idle issues as well. How can I adjust the startup speed down to about 1400 RPM? All times are GMT-6. I did check for the lightning under the hood but all was well. I did notice that when I thought I had it set I've read that a spacer with 4 individual holes will solve this, but after I installed the progressive linkage the noise went away!! That is not something I'd ignore. Copyright 2022 Holley Performance Products, Inc. All right reserved. IAC Creeps To 100% - Holley Performance Products Forums He has walked me through every question Iv. Then you can take a close look at the IAC and see if it is opening. Good Throttle Tip-In tuning can be a bit of a challenge but I'm confident you can get this resolved, Mike.Let me start by saying that unless you've really done a lot of driving on the system in some useful learning situations then I would set this issue aside and not even think about it. So, if pressing the throttle is making it start, it's because you're flooded.Which is consistent with your rich idle condition comment, right? The team at Holley has designed the perfect solution for your problems. Can the return line be an issue?I have had 2 faulty gpa-4 255 walbro pumps go bad. Super helpful and knowledgeable. There are six different acceleration enrichment tables that you can tweak and that may be the way to go. That is the default "Clear Flood" TPS setting and turns all fuel off until the engine cranks. IAC looks good once it finally s fires. When I covered the IAC with my finger, the RPM dropped so low it stalled. I would continue checking the electrical connections along the fuel supply. check out the. But I am having troubles.When stepping on the accelerator slightly with idling, it will be 2000 RPM all the time. You can re-enable this after you have completed this idle speed adjustment process. IAC percentage is 5 to 10% when idling with fans on, What you're experiencing is the delay time between the ECU sensing the additional load and the IAC actually increasing the RPM. to. If the issue persists, you may need to replace the IAC. There is no real mystery here. Hello. ps. This curve runs fom -40 degrees to 260 degrees, and gradually reduces the RPM along that range. 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. Now I have most of the bugs worked out it runs fine on the highway and around town it's just the idle. But I can tell you that for most people who try this it introduces so much RFI onto the Sniper that it never works right. Definitely not 90. So, clearly, the "No" answer is wrong. 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. IAC Pos.% = 0 However, I can't think of a single one that was because of low vacuum. The idle will not return to the set value.The second issue is the same as the first but the motor will stall out. When running it will only stay in closed loop and learn at idle. It then idles up from 750 to 1100. When you have the issue you should disconnect all hoses and plug the ports on the Sniper. I think that this time around you will find that it starts and idles really well and only gets better from there. Is there away to lean the idle out? You are looking in the right area but I would probably not change the ROC blanking. I think that the more important point is that Holley kept sending him units until everything was working. If the TPS is even just 2%, the IAC will go to the hold position (normally 30%) and will not change until the TPS goes back below 2%.If you create a datalog you will be better able to confirm if something is not working correctly. Due to when the pump i'm using now makes a loud howling noise when it gets ran for awhile and it gets at a 1/4 tank of fuel or less. Both answers you've received greatly oversimplify the truth in favor of the answerer. (Do this while you are cranking.) I did all of this before seeing the link you sent. You could install the Holley Dual-Sync Distributor and let the Sniper control your timing. 1. Doesn't want to start, runs like crap. Ive played with the timing on this thing multiple times.Car was fullly restored last year. :-DStill, I hate to leave someone hanging so I'll try to help. idles good, runs amazing. When I finished the install on my C10, I set it as follows: 13.1 at idle, 14.2 at cruise, and 12.9 at WOT. Your comment doesn't imply any sort of problem that would make me give up on idle timing control. Observing the temperature on the 3.5-inch handheld (only), wait for the temperature to achieve 160 degrees F. Once above 160 degrees, turn the idle speed screw so that the idle is about 50 RPM below your target idle speed set in step 1, above. What could be the cause? Everything was working perfectly and I shut off the engine. When I am coming to a stop, the rpms will hang at 1200-1500 rpms. If you did not rotate the distributor to set the actual timing to 15 that might be the only issue. I recently had IAC issues identical to what you describe. Edit I just ordered a Holley return / regulator and cap for the sniper ouletOh, this is not an OEM Master Kit, but the fuel pump should be the same EFI Pro shipped this kit. Hope this helps! technical rep said "You ahve high fuel pressure". You might have a bad IAC, but you can also have a bad vacuum pod on the transmission. Cracked casing from a side cover screw being installed crossed threaded. 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 would have been happy to answer there. Give that a go and see if you don't make some progress! Sorry I didn't buy from you but I didn't know you had sold them. By the way your site and your accessory products are nice. Thanks, That is an strange situation. Kind of cuts into forum time. The Sniper resets the TPS to 0% each time that you key the system on. 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. During cruising at 30 miles and release the gas pedal the engine revs at aproximaly 1500 RPM and it won't drop. Thanks for the information you have provided on this site. Now it registers zero and I have good idle but it will not register until it hits 60 and up. When the lambda is 1.0, the displayed AFR is 14.7;1 REGARDLESS OF THE FUEL. EFI Troubleshooting EFIand and EFI Tuning Tips - In The Garage Media If you have performed the adjustments above and still have RPM issues, it's time to look for clues. I'm going to jump out on a limb here and say you either don't have adequate fuel flow or pressure. I have never seen issue when CTS is below 120 degrees. I appreciate everything you are saying. Replacement Idle Air Control (IAC) Motor for Sniper EFI TBI Systems, Sniper 90/92/102mm Throttle Bodies, Terminator TBI, Avenger 4bbl TBI, HP 4bbl TBI, Commander 950 & Digital Pro-Jection Systems. Data logs show no EMI/RFI. Do I have to hook up sniper ac wire to relay or should iac pick up idle? 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. The window you saw in the image above pops up. 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). So check that timing and I think that you're going to find you need a good bit of advance. sniper Installation If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! Having a TPS that won't go lower than 9% will affect the acceleration enrichment correction, and could create a stumble at the first moment of throttle opening.Yes, the IAC can and will fluctuate depending on changing conditions. 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 There's nothing wrong with manual tuning, but at this point that is just compensating for an inadequate fuel map. I then saw you guys have an awesome little gauge that can hookup inline to the snipers existing fuel feed?? Even 50 RPM can make a difference in how much impact the transition to Drive has on the idling engine's ability to stay at a fixed RPM.I would not recommend it in this situation but anytime a "kick" in idle speed is desired that is easily done by setting the kick value in Tuning > Advanced > Adv. They also worked with me on a sale I missed and price matched those parts. I installed another return spring for the rear plates problem solved instantly. I am extremely suspect of what you were told about the Sniper ECU monitoring fuel pressure, for several reasons. You might have a bad O2 sensor, really bad exhaust leak or a problem with the ECU. Sniper EFI Tuning & Tech. Yes, having an accurate TPS is very important at idle. On startup- cold or hot, I get a 2 second high idle of about 1500 RPM before normal set idle of 750 RPM happens. I believe that for the HyperSpark the Reference Angle should be 57.5. Sniper EFI Idle Tuning - Holley Motor Life I have a feeling it's something simple but I thought I'd ask you first before I inadvertently change something that affects other areas. As you have noted, each time the idle goes up. All times are GMT-6. That is the IAC hold position. I have turned ignition off turned screw in 2 turns and turned ignition back on and tps is at 1-2% not sure whats going on. Then a little faster--until bogs at that level work themselves out. Well, it turns out that with the current firmware this throws the IAC control into a bit of confusion. Holley Sniper high RPM - IAC problem? mail today. I've tried repeatedly re-creating the scenario in hopes that the E.C.M. Hello Chris. Thank you for any advice. I can get it to fire up on the 680-700.I can't find any reason other than it looses where it is in the firmware with I'm thinking it could be the fuel pressure--- since I have a new Spectra EFI tank and there's been some reports of the interior coating coming off and gumming up the pump however the sniper display DOES NOT show fuel pressure.the Sniper DOES measure fuel pressure on its own - i've confirmed that with holley techs as they told me to purchase the fuel pressure gauge that can just hook up to the 1 wire gauge harness from the Sniper. I presume your idle speed table doesn't increase at 200 degrees? Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. I emphasize "and" because the transmission controller manufacturer I used had the TPS ground terminated within the harness to the unit's main ground, which I find to be an unthinkable choice. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. I'm Having trouble with the Sniper on high Idle. I pulled over and turned the car off and then back on. This page was generated at 12:26 AM. Look over all of your vacuum lines and fittings. Fought a high idle issue until I changed your idle speed curve fix along with dropping the IAC hold to 10%. That changes almost instantly as the engine revs.Since the learning algorithm requires some time exposure to a certain condition to make larger changes, that half-second makes only the smallest impact. And since they really had an insanely-tight monetary and real estate budget in the Sniper EFI System, it is unlikely that the added something that wasn't absolutely necessary--and then forgot to use it..And you are spot on about the little Earl's gauge with optional -6 AN port. The Sniper even has a feature that allows it to use the idle timing to control the idle speed. A couple of possibilities that come to mind in order of likelihood: Im having an issue with what I think is the Iac. Installed sniper on 65 galaxie. is the fuel pressure. It's all part of the adventure! If you feel you have no other choice but to run a Sniper and stand-alone controller then you can give this a try. My issue is that when Im in stop and go traffic, I can let off the clutch and the engine revs and doesnt quite want to come back to idle. With the engine still idling high park, set the brake, open the hood, and remove the air cleaner. After a stall the car will restart but will be in a high idle. TPS% = 1 Thanks again Chris, your help has been invaluable.If anyone is considering going EFI, Chris is the man to chat with. Your closed loop compensation is adding a full 50% fuel. So something is triggering the ECU to be in Open Loop. Took it for a lap around the block and came back. THANK YOU for the "First--Check Your Idle Speed Curve Setting!" I received from the controller manufacturer greatly understates (at best) the repeated failures of others I know personally who have tried and failed. I'm compltely stumped and my wife is certainly upset I'm spending so much time between the garage and the computer for something that should basically run out of the box. We have never had that problem with any of the units that we have shipped. But if you will just advance the timing at idle and see if it makes a difference then that will tell you what you need to know. :-). The whole topic of using the Sniper TPS for transmission control is one deserving of it's own article but I'll try to summarize a bit here. Should it not do the opposite and do this on a cold start not warm. 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. I have driven a stand-alone transmission controller for the 4L60E in my (then) Sniper-equipped '95 GMC pickup using the Sniper TPS with complete success. Ran 2 Holley carbs and an Edelbrock. Solving RF Interference Issues in Sniper Installations - EFISystemPro.com If no air is passing (and the idle doesn't drop) then your IAC is working. Hello, I am having a tps and idle issue. I figured out I was going the wrong direction when I was messing with the AFR programming. My problem with the sniper is the whistling and hard throttle pedal, I have a 700r tranny with a kick down cable. I was looking at a data log from my truck earlier this week and noted that at idle my IAC was zero. OK, I did the baseline idle speed screw setting. 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. I have verified that there are no vacuum leaks, not to mention the car runs to good to have a vacuum leak bad enough to make this noise. As I would slow down for a stop sign or stop light, the car would run really rough and the idle did not want to come down. :-). Hopefully replacing the pump again will resolve both issuesWhoa. I have one customer who is having some similar issues and his AFR is down at 9.6:1 when it won't start. It appears that I could now use the dongle and a laptop to custom tune for idle issues if needed. I will try the other stuff when I get off work. Does this seem reasonable and how hard will it be to get the idle and off-idle performance correct? 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 Hey Chris, I installed a Holley sniper on a small block 400, first start was great! Featured Products EFI - Fuel Injection $2.59 - $6,499.95 2179 Products View Parts Sensors I called support line he said he would have to look into it and call back. 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. If you drop it too far the engine will stumble or stall when coming off the throttle with the car out of gear, so you'll know when you've gone too far. I've helped folks work through a number of challenges with their Sniper EFI System installations. Any idea's? Relatively new Sniper EFI install on a '69 Mustang 302. I have quadruple checked my wiring and am certain it's correct. It turns out that some of the Snipers are shipping with the minus 40-degree setting drastically lower, as shown in the following image. Good luck! >I'm using russell hi pressure gas line to feed the gas up to the sniper and using the stock steel gas line that use to be the feed line for the carb to return the gas to the tank. Once engine is warmed up been driving for awhile. You can disable the idle spark control at the locations below. Comp. Be aware that there is a spring behind there and a diaphragm that you don't want to tear. If you can send a data log to the vendor from who you bought your Sniper EFI System they should be willing and able to take a look and recognize RFI and then give you some ideas on solving it. Thanks. Except at idle. I installed my Sniper and the engine fired up great. If you find that adding 5-10 degrees of advance helps then it's time to do reconfirm TDC. I have seen a couple of videos on you tube of the same issue but they don't seem to have found the cure.I hope it is not a computer problem as I have already replaced the entire system because of another problem. The problem I'm having is I cant get the IAC to drop down off 100%. Will restart but only for a minute or so a couple of times then shuts down fuel delivery and will not restart. The Fuel Base map is perfect, the car works well, runs well, running through the streets, the car is great. Follow this link to download it for free if you have not already done so. Sniper EFI - Holley Ensure that the secondary linkage is completely closed (both visually and manually.). However, I have what I will call a whistle at a throttle position on 35 - 50. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. There's still a very small amount of airflow that squeezes past a closed IAC valve; it's that venturi like sound you're hearing. When you open your IAC to 30% you are naturally going to have a high idle condition. I have double checked everythingincluding fuel pressureand have followed the directions to a T.I plan on trying your 10 step process as soon as I get a chance. :-). During after-start idle, the idle will jump up to about 70% if the engine is cold, stay there about 4 seconds and then ramp down to the target idle speed for the current engine temperature. I can tell you that when things aren't working the way you wanted them to work that nothing beats knowing for-sure that you don't have a fuel supply problem. This happens no matter how much I adjust the idle screw. In the datalog the engine is running at 1400 RPM, TPS is zero, IAC is zero, CTS is 185F but it's in Open Loop. The throttle blade adjustment is at 2-6% at hot idle, and with warm engine 185F. 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. Maybe give it a half-turn before you start it and then start and tweak. The fix? Capability Range: Moderate I keep doing that with the same result. EFI Systems based on Holley's world-class Dominator and HP ECU's. Ultimately, it is about making the pedal softer, particularly at initial throttle opening. After much diagnosis, I ended up replacing the intake manifold gaskets. Its just at low speeds, not sure if its loading up or leaning out. The manifold pressure increases with the throttle opening but the RPMs are still low. I installed the Holley Sniper in my Chevelle this winter with a brand new BluePrint 496. I did change the -40 thing also. 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. Save Share. Somehow air is entering the engine that was not entering the engine when you originally set the idle speed screw. The solution is to either lower the IAC hold position or increase the RPM above idle to start ramp (default is 1000 RPM). The problem was RF interferance . Plus, you can email that file to me and I can be of more help. (Don't drive and watch--get a helper!) The engine ran so good, I would have never suspected the Fuel Pressure to be an Now that you've installed at least four Snipers it is going to be imperative that you learn to create and read datalogs. One of the most common symptoms of a Holley Sniper EFI problem is an air/fuel mixture that's too rich or too lean. I had a customer who struggled to understand that. Once we recognize that, the next step is to narrow down all possible sources of additional air until we discover the cause.Start by keeping an eye on your IAC number. Hello, Chris, thanks for the help.I have not installed the software yet, and I'm having trouble with two cars. Why is this? That is certainly not normal! Member List; Calendar; Forum; Holley EFI; Sniper EFI; If this is your first visit, be sure to check out the FAQ by clicking the link above.
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