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Thread: Help please I give up TPS problem.

  1. Default Help please I give up TPS problem.

    For two years, i have Still the same issue.
    Hesitations at partial throttle in any gears
    I am searching for a solution since then
    I replaced many parts

    O2 sensors
    Plugs
    Coils
    Decat pipes
    Cambelt
    filters



    Last day I found a fellow primer with a TPS issue sounding like what I endure for so long.
    I disconnected my TPS and beside the CEL light coming on, I can tell that the car seems to ride perfectly. I reconnected it and the problem came back directly. It seems consistent with what I endure for so long I ordered a new TPS with confidence it will solve my issue at last

    I changed my TPS today (5,02v VCC, 0,48v idle 4,45v wot), I clean my throttle body and check the idle at the same time (little too low eacv disconnected as the engine won't idle )

    And for God sakes the issue is still there

    I now that the car runs open loop when the TPS is unplug, so what else can cause my problem

    I am sorry but here I feel upset and hopeless

    Please help me
    Last edited by metsuki; 14-09-2018 at 04:32 PM.

  2. #2
    Join Date
    Dec 2007
    Location
    Switzerland
    Posts
    811

    Default

    Year/mileage? Could you describe more under which conditions it hesitates? Below or above 4k rpm?

    Did you check the fuel delivery?

    Short test: did you disconnect the o2 sensors and see if it's any better? Two plugs on the cylinder head.

  3. Default

    1993
    145000 kms
    Manual
    Hésitation at very little throttle but i think all the way up
    I already bypass the fuel regulator with no effect at all, but did not go forward checking fuel delivery precisely
    Both O2 sensors are New ans did not change nothing

    the only thing i cannot understand is why TPS unplug everything Come back to normal. Can a bad fuel pump work fine acter unpluging thé TPS?
    Actually i already went far beyond what i thought i could troubleshoot
    Last edited by metsuki; 14-09-2018 at 04:33 PM.

  4. #4
    Join Date
    Dec 2007
    Location
    Switzerland
    Posts
    811

    Default

    I'd bypass the fuel pump resistor and see if it makes a difference. Done in 1 minute.

  5. Default

    You can ses Just above, i already done that without result

  6. #6
    Join Date
    Dec 2007
    Location
    Switzerland
    Posts
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    Default

    Did you also clean the injectors and replaced their o-rings, esp. the lower one?

    Did you also check for 'wrong' air?

  7. Default

    no i did not
    but if i had a problem with those would'nt i have a problem all the time even when i unplug the TPS?

    what other sensor can i unplug putting the car in open loop, just to check if my problem is solve by unpluging the TPS or just by running open loop?

  8. #8
    Join Date
    Dec 2007
    Location
    Switzerland
    Posts
    811

    Default

    Open loop: runs richer. The effect of a small air leak could be masked.

  9. Default

    how can i check that easily?

  10. #10
    Join Date
    Dec 2007
    Location
    Switzerland
    Posts
    811

    Default

    Install a wideband o2.

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