1990 Ford F150 engine idle

1990 FORD F-150
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GREGWILSON62
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  • 2 POSTS
Engine Performance problem
1990 Ford F150 V8 Two Wheel Drive

engine wont idle down i have changed fuel map sensor o 2 sensor throttle position sensor
Jan 1, 2010 at 11:37 PM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
check the iac control module and make sure that the pintle is moving freely inside of it and the passages in the throttle body is clean. does the vehicle just idle high or does it hunt
Jan 2, 2010 at 12:41 PM
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GREGWILSON62
  • MEMBER
  • 2 POSTS
it just idles really high
Jan 2, 2010 at 11:23 PM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
defintely clean the iac module and its passages. also clean the throttle body plates and bore they may not be shutting all the way. also make sure the throttle body iisnt binding due to a something on the cable or pedal.

next check for vaccum leaks from the maf sensor and forward after that. and lastly check the PCV valve and make sure it isnt plugged.
Jan 3, 2010 at 1:43 AM
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