Question about 1991 Plymouth Colt
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!
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
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Posted on Jan 02, 2017
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Nov 05, 2015 | Ford Cars & Trucks
Here are the more common cause of surges, stalls at stops, slow idle speed, erratic idle, it is in most cases the idle speed control air-bypass valve and/or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving
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