Question about Mercury Grand Marquis
Engine stalls ,hard to start ,runs rough
Service Engine light came on and stays on and this is on my 1995 Grand Marquis LS 4.6 litre Engine. It is now idling a little rough
Posted on Oct 19, 2009
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Posted on Jan 02, 2017
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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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