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1996 Mercury Mystique ENGINE IDLE

Tiny
MARK W
  • MEMBER
  • 1996 MERCURY MYSTIQUE
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 18,000 MILES
1996 Mercury Mystique 2.0L mileage: 180,000.
Just had the cly. Head / valves / headgasket done.
car running great for a few days, now while driving the car, the idle speed went up to 2,000 - 2,500
RPM and will not go lower. I unhooked the throttle and cruise control cables, no change. Throttle body butterfly valve looks fully closed.
I unplugged the mass air flow, the idle did drop but
idled very rough and stalls.
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Tuesday, August 24th, 2010 AT 11:09 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
The engine likely has an air leak somewhere letting unmetered air into the system.

You could have a bad IAC (idle air control) but would more suspect there is a line off.
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Tuesday, August 24th, 2010 AT 11:48 AM

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