Car Often Revs to 3k On It's Own At Startup?

[fast 3.4]

Anyone else ever had this problem? Kind of annoying, I used to hyave a vaccum leak a long time ago, but I fixed it. I can't find anymore and can't see what else would cause this.

Suggestions or tips on finding vacum leaks?

P.S. I noticed I idle slightly higher in park and neutral (1.2k or so)

[camaro862gcj]

Re: Car Often Revs to 3k On It's Own At Startup?

I have this same problem with my 3.4 as does one of my friends. I actually asked a tech today and he said to make sure there is no air in the coolant cause that could cause the IAC be get an incorrect reading at startup. I'm probably going to try and bleed it tomorrow and see if anything changes.

[BLLDOGG]

Re: Car Often Revs to 3k On It's Own At Startup?

maybe check for a restriction in your intake system? maybe a really dirty air filter. inspect the throttle body for any restrictions and excessive deposits and check for such things in the IAC passage and on the IAC. if you want, clean the throttle body and IAC with carb cleaner or similar

[fast 3.4]

Re: Car Often Revs to 3k On It's Own At Startup?

I was unaware the 3.4 had an coolant air bleed valve or procedure?

I have a K&N, recently cleaned, but cleaning the Tb is not a bad idea, thanks.

[Vanquish]

Re: Car Often Revs to 3k On It's Own At Startup?

Yes, anytime you do extensive work on your coolant system you have to bleed the air out of it.

An easy way of doing it is just leaving the cap off until all the air bubbles stop popping, then close her off.

And yes, cleaning your TB is a great idea.

[Tech]

Re: Car Often Revs to 3k On It's Own At Startup?

An easy way to get the air out of your cooling system is to start the car with the radiator cap off, let it get to operating temperature, and give it a series of rev's to about 3-4k. Turn the car off, and CAREFULLY install the radiator cap.