88 ford ranger. Idling at 1200-1500 RPMs and gets 12 MPG. What is wrong?
The only thing i have done to it was clean the intake with B12. I also used jb40 with that. Seems like sometime after that this happened. The truck runs great, its just idling high and its using alot of gas.
Some trobleshooting tips would be cool.
I don't want to go replacing a bunch of stuff i don't need too.
I appreciate your help.
Look for a vacuum leak first.
Very common issue is deteriorated vacuum lines. A vacuum leak will cause it to think you have it in partial throttle and result in the conditions you described. Go over all of your vacuum lines and check for deterioration or damage. If you find the culprit pull it off and take it into your local parts store. Most of them will have vacuum line by the foot and all you will have to do is match up the right size. Last time I needed some it was like 29 cents a foot.
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