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What are the symptoms of malfunctioning TPS sensor and is it possible to ....

Discussion in 'General Explorations!!' started by stevemya76!yaho, September 20, 2002.

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  1. stevemya76!yaho

    stevemya76!yaho Member

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    clean it. If so how????????

    Thanks.
     
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  3. Lifted95X

    Lifted95X The Xplorer U Luv to H8

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    I highly doubt you can clean it....but I don't know the symptoms.
     
  4. Alec

    Alec Elite Moderator Moderator Emeritus

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    The TPS controls many engine and also tranny functions. You can't really clean it. Sometimes if it's bad it will throw a code, but most of the time it wont. It interacts with so many computer routines that you can't really pinpoint definitive symptoms. At least I can't.

    The only way to truly "blame" the TPS is to monitor it's voltage.
     
  5. stevemya76!yaho

    stevemya76!yaho Member

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    Thanks Guys,
    I already replaced MAF and IAC. Cleaned IAT. The check
    engine light is stil on. When I did a diagnostics, the code was P0300(random multiple misfire). From what I was told I now have two choices: Tune up and/or Coil Pack replace.
    What can you suggest. Should I spend $70 for a full diagnostics? I'm not sure if that will point out the exact problem.

    What should I do???
    THANKS.
     
  6. Alec

    Alec Elite Moderator Moderator Emeritus

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    With a random multiple misfire, it probably isn't the plugs or wires (it would point to a specific cylinder). Though if your plugs and wires have close to 60k miles on them you should replace them.
     
  7. stevemya76!yaho

    stevemya76!yaho Member

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    My 97EB has 68K. When I bought it it had 62K, but the previous owner told me he had done tune up at 60k.
    Maybe the tune up was not done correctly. But I doubt
    cause he had it done at the ford dealership. So I have no idea what to do.
    Will full diagnostics will tell me the exact prblem?
    Because the only diagnostics I did was done by AUTOZONE, which does not tell every single prblem that is comming from PCM.
     
  8. james t

    james t moderation Staff Member Moderator Elite Explorer

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    yea, get a full monitor done. that should tell you whats wrong. and i agree, a random missfire prolly is not gonna be wires/coilpack/plugs. could be the TPS, could be about 10 other things. so, get a full diagnostic run on it to keep from replacing stuff you dont need.
     
  9. Maniak

    Maniak Moderator-Stock 91-94 Staff Member Moderator Elite Explorer

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    You can test the TPS.. When a TPS is working correctly you can see the voltage change smoothy (if it is connected) or see the resistance change smoothy (if you have it off the vehicle)..

    Usually when there is a bad TPS the voltage/resistance jumps right when you start to move the TPS.

    Here is a how to on testing the TPS I wrote a long time ago (you can pretty much rule out the TPS after you check it.. one less thing to worry about). This was written for a first Gen Explorer but the basic procedure should be the same for all motors with a TPS (the voltage may be slightly different etc).

    http://mark.legendz.com/code124.html

    ~Mark
     
  10. BradE.

    BradE. Active Member

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    Multiple misfire could be clogged/obstructed injectors, have you tried running a bottle of injectior cleaner though it?
     
  11. stevemya76!yaho

    stevemya76!yaho Member

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    Thanks.
    Yes I did used injector cleaner. It does run a little better, but not perfect.
     
  12. Robert

    Robert Well-Known Member

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    Have you looked for any air leaks between the MAF and the throttle body?
     
  13. Robert

    Robert Well-Known Member

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    Steve - Also a TSB was just released regarding P0300 codes. Here is another cause (labor is charged at 6.1 hours):

    ISSUE
    Some vehicles equipped with the 4.0L SOHC engine may exhibit a CHECK ENGINE LIGHT "ON" with Diagnostic Trouble Codes (DTC) P0300 (Random Misfire) or P0301. The DTC will set when the engine is operated at high RPM'S (4800 RPM and higher). The Misfire code results due to system interaction of higher than expected transient exhaust system backpressure (under heavy acceleration) coupled with valve spring resonance points experienced at these engine speeds. This interaction may cause the' exhaust valve to hang open at engine speeds of 4800 RPM and higher.

    ACTION
    Verify that the DTC sets only at 4800 RPM or higher. Remove current intake and exhaust valve springs and replace with new service intake and exhaust valve springs. Refer to the following Service Procedure for details.
     






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