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Thread: TPS goes to 1% on startup.

  1. #1

    Default TPS goes to 1% on startup.

    I’ve got a TPS issue. TPS reads 1% at idle with no foot on the pedal. Do a TPS Autoset and it reads 0 until I start it up. Once it starts, it automatically goes to 1%. Any ideas?
    1932 Ford 3 Window, Injected SBC
    1970 Nova 5.3L, S475 Turbo, 275 Drag Radial

  2. #2
    Join Date
    Dec 2009


    Install a throttle return spring, try repositioning the TPS sensor mounting, or slightly back-off the idle speed screw after a TPS Autoset so the TPS Position always returns to 0%. (General IAC Information - Read "IAC NOTES")
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 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 M/T Street Comp tires.

  3. #3
    Join Date
    Nov 2014
    Ont. Canada


    If it really bothers you, set your idle slightly above your Target Idle Speed, then do a TPS Autoset, then start it and back the throttle off until you get to your Target Idle Speed.

  4. #4


    It's pretty common. When you do the TPS Autoset, put a .010" feeler gauge between throttle lever and stop and then it will read zero with engine running. I will add though that usually reading 1% at idle is OK. I've only had it happen once that the ECU didn't recognize a closed throttle and I knew it because RPM would hang around 1,200. Did TPS Autoset with the feeler gauge and problem solved.

  5. #5


    Got it handled. Had to manually move the TPS sensor. All good now. Thanks for all the replies guys. I appreciate it. The feeler gauge is a good idea though.

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