Question about 2004 Ford F150
Sounds like your computer needs to relearn it's idle. What you should do is disconnect the negative battery cable for a minute or so. Reconnect it. Star vehicle but DO NOT drive it. Let it idle if it will for 10 minutes (you may need to help it but don't gun the engine just hold it steady and not at a high idle) then turn the air conditioner on for a few minutes. Now drive the vehicle for about ten minutes and that should clear it up. There is a couple of other things that could be wrong such as; did you unplug or plug the computer in when the battery was still connected ? If this is the case you may have bigger problems but may be something as simple as a fuse if this is the case. Try the relearn procedure first. If that doesn't work reply to this solution and i should recieve an email letting me know you replied or you can email me at firstname.lastname@example.org with any questions and I will see if i can help you. Remember to tell me your make model and year if you email me. Anyway I hope the relearn works for you and good luck....
Posted on Mar 19, 2011
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Posted on Jan 02, 2017
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When you re-connect the battery and re-start the car, it has to "re-learn" all the correct settings for your particular car's engine all over again and the only way that happens is by actually using the car. Taking the car to the dealer as someone else suggested won't do any good, unless you like paying $65+ per hour for the mechanic to drive your car around and get it all warmed up. :-)
After about the first 10 miles, the idle will be much better. It will take 30-50 miles for the entire re-calibraton to finish. Take a 25 mile interstate road trip one way, turn around and come back home.
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