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1991 Ford F150 - Page 2 Questions & Answers
My 1991 Ford F150 won't idle when
Did you also change the Coolant Temperature Sensor? If it is reading wrong, the computer may not realize the engine is cold, and won't increase the gas for that.
Spray some carb cleaner around the outside of the throttle shaft, if engine speed increases, that could be a vacuum leak. I've never heard of that, but anything is possible. It sounds like it would have to be a serious air or vacuum leak to cause your problem. Have you blocked off the power brake booster to check if that is leaking?
You might want to do a compression test to see if there is any internal mechanical damage.
Thanks, how do I reset the codes ?
take off the battery cables and wait a couple of minutes then put them back on this will clear all the codes after this if you are still getting a check engine light go to auto zone and get it scanned for free to find out what's wrong
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