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2002 Ford F-150 rough idle

Tiny
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.
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Friday, April 9th, 2010 AT 4:26 PM

3 Replies

Tiny
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
Tiny
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
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok thanks. If there is anything else you need just ask.
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Monday, April 12th, 2010 AT 11:55 AM

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