2002 Ford F-150 rough idle

EDGAR PERKINS

MEMBER
2002 FORD F-150
V8
2WD
AUTOMATIC
77,000 MILES

When I first start my truck in the morning it idles rough likes it as a big cam in it. But after about a minute it stops and starts to runs smooth. I noticed it happened at work when it started it after it sat all day for 8 hours but about 30 seconds later it ran smooth. Can you give me an idea what this might be.

3 Replies

RACEFAN966

MECHANIC
5,029 POSTS

First off is the check engine light on? If not no worries. Now what I would like to have checked is the coolant temp sensor. You simply unplug the sensor (near thermostat) and then with a digital multi meter ohm the sensor across the terminals and do this cold. Get back to me with the ohms and air temp at the time and I will look it up to see if it is bad.

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Saturday, April 10th, 2010 AT 8:00 AM

EDGAR PERKINS

MEMBER
2 POSTS

I did have engine codes that said misfire in cylinder 1 also EVAP leak. I talked to a mechanic he said it could be the air idle control valve he recommended me to try and clean with carb cleaner which I did and the problem is gone. Thanks for your help.

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Sunday, April 11th, 2010 AT 2:43 PM

RACEFAN966