Question about 1998 Nissan 200SX

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Ok i just bought my 200sx and my check engine light comes and goes after filling it with gas, and now its staying on and my car is a manual and when i shift from like first to second and even third and then come to a stop or if im going down a hill ill go into neutral the engin stays reved but then when i come to a complete stop my car idols fine and sounds so good i cant even tell its on.... Had a cold smoke test done on it no leaks and engine is not knocking.... machanice said it might be a sensore which is making it rev different so he said to put some fuel injector in it to see if that did the trick and nope .....have had the fuel cleaner in for about a week now ans still same thing pls help.... cars runs amazing no leaking not getting hot nothing..........

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  • Larry Kappenman
    Larry Kappenman Oct 06, 2010

    Are you worried about the check engine light or the revving differently?

  • stephenso581 Oct 06, 2010

    The reviving

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It sounds to me like the throttle position sensor is bad. The fuel injection cleaner might not help this case. Since your car newer than a 1996,you will have a computer system known as an OBD2. This diagnoses anything wrong with the car and will set the check engine light on whenever there is something wrong with the system. I suggest hooking an OBD2 scanner up to it and see what the code reads. Even though it may be off now,the computer should store the code for a while. Also if they hook up more complex scanner to it,they can see what is going on with the car as they drive it.

Posted on Oct 06, 2010

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