1990 Ford F-150 engine idle

GREGWILSON62

MEMBER
1990 FORD F-150

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

Saturday, January 2nd, 2010 AT 7:37 AM

3 Replies

BLACKOP555

MECHANIC
10,371 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

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Saturday, January 2nd, 2010 AT 8:41 PM

GREGWILSON62

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2 POSTS

It just idles really high

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Sunday, January 3rd, 2010 AT 7:23 AM

BLACKOP555

MECHANIC
10,371 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.

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Sunday, January 3rd, 2010 AT 9:43 AM