Question about 1991 Plymouth Colt

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1992 colt, idles rough

The car runs fine when the engine is cold but when it warms up it idles rough and eventually dies. I am pretty sure the head is warped because it leaks oil around the head. I think that some oil is seeping into one of the cylinders when the motor warms up. Any help would be greatly appreciated!

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I believe that the oil you are seeing is from the valve covers and drooling down the engine. If oil does go inside the engine cylinders it would usually show up when the motor is first started and seen as blue smoke when running and will slowly go away as the engine warms up!

Most likely you have a bad Idle motor which is mounted on the intake manifold. If the motor can run better with your foot on the gas but dies if removed then it is probably this. This motor is controlled by the OBDII computer which gets it's control signal from the temp sensor which is located either on the radiator or engine block (which could also be bad), if the electric fan (if equipped) turns on then this is not the problem part, but the idle motor is. Another possibility is that you have some bad /cracked vacuum hoses which should be checked for first, before replacing the idle motor.

Posted on Nov 30, 2008

  • Richard Lilja
    Richard Lilja Nov 30, 2008

    I am sorry the Idle motor is the wrong part that you should be looking at it!
    It is the choke which is bad which is still controlled utimately by the temp sensor. It should be full on when cold and full off once warmed up at which time the idle motor takes over.
    So check the hoses, temp sensor and choke assembly.


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