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Thread: Stalls when throttle applied in drive - idles good though.

  1. #1

    Default Stalls when throttle applied in drive - idles good though.

    So I've been reading though all the stuff that Danny has put up for us new guys just having installed our sniper kits. I finally got the engine to run and now I have set the initial timing at 15°. I've been trying to get the IAC to stay between 2-10%. Yes, the engine is at full operation temp. Currently sits about 190°. I have the IAC sit at 5%, but then it starts to drop and eventually gets down to 0. Between adjustments I restart the car so the TPS will reset as instructed.
    I noticed that Danny suggested getting a PCV that has the smaller hole not the variable orifice. I'll go pick one up in a minute.
    I'm uploading the video here so you can see it. Let me know what you think. https://youtu.be/iR620NOS2_k

  2. #2

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    Can you tell us more about your engine setup? At a quick glance your AFR drops so you're going extremely rich so the IAC opens in an attempt to increase air flow and lean everything back out. I'd like to see your Config File so I can see how your Base Fuel Table, Target AFR and Timing table are set.

  3. #3

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    I'd be happy to supply you with that info. Can you tell me how to get those and I'll post em. The engine itself is a Pontiac 400, pretty much all stock components in it with the factory style performance cam. (COMP 51-116-3) It has the #15 heads so the valves are 1.96/1.66 with a 75cc chamber. I'm running the Sniper EFI kit with a MSD 6EFI CD & Master Blaster 2, dual sync distributor.

  4. #4

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    Increase timing to 20° at idle. Switch to a screen that allows you to see the CL Comp so you can see if the system is adding or removing fuel. My guess is that you have a super rich Base Fuel Table. You probably need to lean out the Base Fuel Table so the Sniper doesn't have to do so much work to keep running.

  5. #5

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    OK, I can change the timing. I'm assuming I also need to change it to 20° in the initial timing on the handheld correct? By CL you mean Closed Loop? Sorry, I'm new to this stuff. I have no idea how to adjust the fuel map, or even find it on the handheld. I downloaded the Sniper file, but it will not let me upload it here.

  6. #6
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    Default

    Quote Originally Posted by 1969customS View Post
    I'm assuming I also need to change it to 20° in the initial timing on the handheld correct?
    You're supposed to be using either the 3.5" TSLCD or the Sniper EFI (laptop) software. If/when a problem occurs, you're done using the handheld controller. Andyf is referring to the Sniper EFI software.

    By CL you mean Closed Loop? Sorry, I'm new to this stuff.
    Yes, CL means Closed Loop. CL Comp means Closed Loop Compensation.

    I have no idea how to adjust the fuel map, or even find it on the handheld.
    The Base Fuel Table (fuel map) is not in the 3.5" TSLCD. It's in the Sniper EFI (laptop/PC) software. Stop & read this:
    http://documents.holley.com/techlibrary_199r11259.pdf (Holley Sniper EFI Help Manual - EFI Software, Tuning & Datalogging)

    Sniper EFI Software Help Information/Instructions:
    ‒ On the top Toolbar, click "Help" & "Contents". This opens all Help topics.
    ‒ When navigating the Sniper EFI software, click "Help ?" or the F1 key.
    ...This automatically opens the definitions for that specific parameter.
    https://www.holley.com/support/resou...Fuel_Injection (Holley Sniper EFI Software & Holley 558-443 CAN/USB Dongle)
    https://forums.holley.com/showthread...679#post100679 (Holley Sniper EFI Optional Comm/Data Cable Accessories)
    http://documents.holley.com/techlibrary_200r623a-5.zip (Holley Sniper EFI SD Card Contents)
    http://documents.holley.com/techlibrary_199r11259.pdf (Holley Sniper EFI Help Manual - EFI Software, Tuning & Datalogging)
    http://documents.holley.com/199r11031r.pdf (Holley Sniper EFI Instruction Manual)
    http://documents.holley.com/199r11193.pdf (Holley Sniper EFI Quick Start Manual)
    http://documents.holley.com/199r11369.pdf (Holley Sniper EFI Troubleshooting Guide)
    https://forums.holley.com/showthread...2178#post92178 (Holley Sniper EFI Technical Information & Troubleshooting)
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  7. #7

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    Quote Originally Posted by 1969customS View Post
    OK, I can change the timing. I'm assuming I also need to change it to 20° in the initial timing on the handheld correct? By CL you mean Closed Loop? Sorry, I'm new to this stuff. I have no idea how to adjust the fuel map, or even find it on the handheld. I downloaded the Sniper file, but it will not let me upload it here.
    For downloading the Config File: https://youtu.be/jBiv8fpbers
    The .sniper file must be in a .zip folder then you can attach it to the forum.

  8. #8

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    I guess I had the wrong EFI software. Was trying to open the file on the Holley EFI software. I got the correct one now. Thanks. Still not sure what all this means or how to adjust it. It's a bit over my head at the moment, but hope to start understanding it soon. Thanks. redlady_2_15_2020.zip
    Last edited by 1969customS; 02-16-2020 at 01:09 AM.

  9. #9

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    I see it's pulling -20% of fuel in your idle range. Your timing goes from 15° to 25° then 36° from 2000-2500 RPM. This is not your problem right now, but will cause issues when you are cruising. First, I'd check for vacuum leaks and dive further into the PCV issue as you stated in your first post.

  10. #10

    Default

    4150_4_Z 2_15 7pm.zip
    So I decided to try a fresh file in the computer, so I deleted the original Sniper files (backed up on my computer) and installed a better PCV valve. Since mine has a barb on both sides of the PCV valve I was limited on my options. I got the one that had the least amount of airflow, but still operated. I was able to adjust the IAC a bit better with the new PCV valve. I set it at 5 and went outside for a test drive.

    I was able to drive it in reverse with no issues. I switched to drive and was able to get up to about 30 or so if I didn't romp on the pedal. As soon as I gassed it hard it would want to stall out. I did check for vacuum leaks using the carb cleaner spray trick. I sprayed all around the intake, Sniper, and near any vacuum lines including the line to the transmission modulator. No spikes in the engine at all, so I would assume no leaks.

    I'm attaching a video of the driving example showing that if I gun it, it wants to stall out. Then with me going gently and it driving fine. https://youtu.be/WTvLvtfDgAg

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