Mechanics

GRAND MARQUI

1991 Mercury Marquis • V8 2WD Automatic • 175,000 miles

I have a 1991 mecury grand marquis. The car will not start when the motor is warm unless the gas pedal is presses to the floor. Also is seems to be idled to high although the idle screw is not touching. However when the car is cool it cranks and runs/idles fine. This problem started when my intake manifold leaked water but it has been fixed and the problem persists. Please help. Tps sensor and idle control have been replaced
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CJ456
March 23, 2011.



Have you checked for vacuum leaks? Have you checked to see if the idle air control valve is good?