my engine sometimes revs when its on idle. Sometimes it would bounc from 1 to 1.5, or 1.5 - 2 I forget but does anyone know why it does this someimtes? thank you.

 

Apprently you don't know how to use the search function. I have typed this out a thousand times. Do a search on iacv cleaning or fitv cleaning.

 

most likely its the iacv located on the back of the intake manifold it has 2 coolent lines going to it. take it out and soak it in brake cleaner, let it dry and it should be good.

 

Sounds like a vacume leak. Check all of your vacume lines for holes, deterioration. One way of finding vacume leaks is spray carb cleaner around the vacome lines/intake mani area and when your rpms increase you've found you leak. In no leaks are found then I'd try cleaning out the IACV/FITV if present.

 

How is that possible, you only have 337 posts

 

ever since the new TCC and having to sign up new usernames we all lost our post counts....booo.

Could be a vacuum leak, could have an air bubble in the coolant, could be the idle air control valve or fast idle thermo valve (like others have mentioned).

 

do you have any clue what my old post count was? Like I said, I've typed it out a thousand times.

 

Had the same problem.
Let the engine cool down. Open the rad cap and leave it on loosely. Start your car and let it run until the fan turns on..if it doesn't then let the car idle for a while (20 min).
Tighten rad cap.
Problem should be fixed.

 

No, no I do not.
But if I was psychic, then maybe.

 

hm where is the iavc loacted? how hard is it to remove and clena?

 

back of the manifold. two 12mm bolts. Usually i remove the unit fully my un plugged the pigtail and removing the two coolant hoses and clean it outside the car. But for a cleaner/quicker service, I will do it on the vehicle with the coolant hoses still attached. Make sure to clean the ports as well