2004 Ford Truck Engine speed fluctuates when cold

JAMES BENNETT

MEMBER
2004 FORD TRUCK
6 CYL
2WD
MANUAL
94,000 MILES

The engine speed when cold fluctuates until it warms up then it idles fine. What do you think could be the problem? I have replaced the plugs fuel and air filters. I have also noticed that at the end of summer the idle speed did not kick up all the time when I turned the A/C on. Is it possibly related? Any assistance would be appreciated. Thanks, Jim.

Friday, December 12th, 2008 AT 3:23 PM

1 Reply

MIKE H R

MECHANIC
3,094 POSTS

I would start with checking the throttle positoning sensor. Have you had it scanned? If you did and it comes upw ith a po123, po222, po223, po122, these codes are desiginated to the tps. That would cause the difference with the ideling.

I would have it scanned for trouble codes.

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Tuesday, December 16th, 2008 AT 8:12 PM