Question about 1992 Lexus Sc 400
My sc400 is automatic and when it starts up when in park it is fine. If you put it in neutral it idles higher. Then in drive it goes back to normal. Now, if i leave the car to warmup for about 5mins. then it starts to stumble and idle roughly. I recently changed the ignition coils and replaced the spark plugs.
I believe that it may be the idle air control valve, but not sure. No codes, except for an oil pressure light, but the oil seems to be pumping up to the top fine. So back to the idle problem... when it's warm and stumbling on the idle... if i throw it into drive or reverse it stalls! If i give it some gas it will not stall. Please help!
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Posted on Jan 02, 2017
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Engine stalls or RPM
fluctuates at idle up and down or dies near idle.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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