Mercury Mystique Problem Report

Mercury Mystique Engine Stalling and/or Hesitation on Acceleration due to Faulty Idle Air Bypass Valve

(8 reports)

If you experience difficulty starting the engine when cold, stalling at idle, or hesitations during acceleration, it may be the idle air bypass valve. This valve helps the vehicle idle steady when the accelerator pedal is not pressed.

I'm having problems with starting car in mornings. The car will crank but not turn over. I've brought the car to 2 different mechanics after repairs were made w/ new fuel pump, radiator fluid changed, new sensors, and finally a replaced air control valve. After the new valve the car ran fine for 3 days, and then the problem started all over again. The car runs fine & restarts great after it is warmed up. But, the mornings it will not start. I'm about ready to give up! -
stalling, rough/erattic idel cleaned iac valve with carb cleaner -
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