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99 mustang idle help?
I just bought a 99 mustang v6 auto, 149k miles. Sitting for a couple weeks til today. Everything is pretty good and runs pretty well, except it has a bit of an excited idle. It fluctuates from 1100 to 1500rpm pretty regularly. I Added Seafoam to the half tank of gas. It idles more consistently when the AC is off, but still at 1100rpm. Any ideas what I can do to lower that idle to a more reasonable and consistant 6-700rpm like it is supposed to be?
2 Answers
- Anonymous9 years agoFavorite Answer
If the engine is surging, could be a dirty air filter, or dirty mass air flow sensor. Take the air filter out and start it, see if that makes a difference. Also unplug the maf sensor and see how it idles (dont drive it with it disconnected though.
- ?Lv 69 years ago
Check the IAC on the back of the throttle body, it may be dirty and stuck. Also a bad coolant temp sensor will do that
