3.8L. V6. Why does my engine idle erratically or lope at idle when cold and then run rough at idle when warm? IAC valve already replaced. Thanks.
2007-02-26 13:42:01 · 8 answers · asked by freelivingnot4long 1 in Cars & Transportation ➔ Car Makes ➔ Ford
If the vehicle has exhibits a rolling idle, you more than likely have a vacuum leak somewhere, or a dirty MAF sensor. Especially on a vehicle of that age, I would verify the integrity of the PCV system, and check everywhere for cracked rubber hoses. You will not be able to "scan" this vehicle unless you have access to a scan tool that reads EEC-IV systems on Fords earlier than '96 model years.
2007-02-26 13:56:31 · answer #1 · answered by Anonymous · 3⤊ 0⤋
A dirty MAF sensor will slow the sensor response. That usually causes the surging. It takes so long for the MAF to register a change in air flow, that the RPM fluctuates. It might not trigger the check engine light.
The MAF sensor can be cleaned, but you need to be very careful not to touch the wires. Do a search to find instructions.
I had a dirty MAF cause surging on a '95 3.8L. I fixed it for the cost of some brake cleaner and electronic cleaner.
2007-02-26 16:03:06 · answer #2 · answered by vrrJT3 6 · 0⤊ 0⤋
I'd agree with Rakel, check for vacumm leaks espcially at rubber hoses... But I had one doing the same thing that I wound up having to change the MAF sensor on to correct as the sensor was so dirty the car couldn't figure out the right amount of air going in
(On the MAF sensor, a light dust on the wires that are the size of maybe 10 human hairs bunched together can cause a word of problems)
2007-02-26 15:36:50 · answer #3 · answered by gearbox 7 · 1⤊ 0⤋
Yep, dirty MAF. It can be cleaned as has been stated. Electrical contact cleaner is best, if that is unavailable use anything that will NOT leave a residue. If you can just spray it and it works thats great. You can use a Q-Tip to clean heavier grime off, but as has been stated be VERY careful as the wires are fragile.
2007-02-27 02:32:59 · answer #4 · answered by traveler 2 · 0⤊ 0⤋
Air pockets in cooling system, if the engine is a 3.8L looks like head gasket trouble
2016-03-29 02:20:19 · answer #5 · answered by Anonymous · 0⤊ 0⤋
i own a shop,and the best thing you could do is have it scanned at any auto zone and see if they come up with any trouble codes on it,you can play the guessing game all day long with it,and they can tell you in less than a few minutes probably whats causing this to happen,good luck i hope this help,s.
2007-02-26 13:47:14 · answer #6 · answered by dodge man 7 · 0⤊ 2⤋
Whoa, you've got some heavy hitters answering this question, if they say it's so, then I'd believe them. Good luck
2007-02-26 16:27:10 · answer #7 · answered by Fordman 7 · 0⤊ 0⤋
The 3.8L, 3.0Land 2.9L are ****!!!!!!!!!!!
2007-02-26 17:55:26 · answer #8 · answered by Sean T 2 · 0⤊ 0⤋