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Thread: Stalling during idle, and TPS going wild?

  1. #1
    Join Date
    Sep 2019
    Location
    Toronto, Canada
    Posts
    3

    Default Stalling during idle, and TPS going wild?

    Hi everyone. I have the Sniper EFI BBD and am using it in a 1990 Jeep YJ. I'm using it alongside a distributor coil (Team Rush Upgrade), and a stock 258 engine. I've been enjoying the system, but I'm having sporadic stalling and rough idle during slow downs/stops. The only red flag I can see is the TPS. While cold, and at 0%, the whole system is well behaved. As it warms up, and I use the throttle, it seems to either.
    A. Get TPS stuck at 15% during idle and run perfectly. (Until B. occurs - randomly while coming to a stop it'll jump back down to 0% and do B.)
    B. Have a lot of trouble staying at 0%, and randomly jump around before I hit the throttle and it settles back at 15%.

    I've provided a link with two datalogs. As per forum requirements, recording 26 is a short link and I believe demonstrates the strange behavior and stalling perfectly, though 28 is a long drive where the issue rears up its head multiple times and may be more applicable. https://drive.google.com/drive/folde...Qp?usp=sharing

    I'm trying to provide as much detail as possible, and do realize I have not included a Config File. That will be next, though I suspect the strange TPS behavior is the culprit. Please let me know what additional information, tests, or data I can pull to help diagnose the problem. Additionally, thank you in advance for your support. I love my Jeep (it has been a passion project of mine) and I just want it to run right. Any support in that goal makes you my hero. Much thanks, Brad (Katakto)

  2. #2

    Default

    Strange behavior is almost always due to RFI noise. RFI noise is usually caused by spark plug wires being too close to Sniper wires, but other things can cause it. You need high quality resistance wires and resistance plugs. You also need to be super careful about the routing of the coil wires. Look at your datalog to see if there is any negative time. Negative time means the unit is resetting.

  3. #3
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    1,430

    Default

    No signs of EMI in the datalog I looked at. Get a new TPS.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,965

    Default

    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  5. #5
    Join Date
    Sep 2019
    Location
    Toronto, Canada
    Posts
    3

    Default

    Thanks all! I was able to get an replacement from Canadian Tire, the BWD EC1032: https://www.bwdbrand.com/en/ecatalog...ype=x&search=s. It says Made in USA, so I'm hoping it's more durable than the stock TPS (made in China according to the description on Amazon.ca - https://www.amazon.ca/Holley-543-111.../dp/B00MIXI95K). I've only had the unit installed for a month or two, so the failure is not due to age. I'll be sure to update everyone when I get it installed (either over this weekend, or next).

  6. #6
    Join Date
    Sep 2019
    Location
    Toronto, Canada
    Posts
    3

    Default

    Quote Originally Posted by 81 TransAm View Post
    No signs of EMI in the datalog I looked at. Get a new TPS.
    Quote Originally Posted by Danny Cabral View Post
    Car running 100% PERFECTLY, thank you both! TPS did the trick.

  7. #7
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,965

    Default

    You're welcome, and thanks for the update.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

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