High Idle (4k RPM)

[sburna]

Searched the forums and didn't find any topics similar to my problem. So
I just finished a headgasket and timing job on my 95 eclipse, after getting the head back from a local machine shop.

After installing everything back together, I started it up. Upon starting, the rpm revs up to 4k and idled there. I then took my car back apart.

The timing lined up but redid it to make sure, found a broken thermostat (which I doubt could caused the high idle) and replaced it.

Finally started it up again and the same thing happened. I'm at a lost and need help to figure out my problem. Thanks in advance for any help.

 

[DSMcrazy3]

That's a bit unusual, check for any vacuum leaks. Check the throttle body, make sure it's closed completely while the car is off. Something is flawed in the re-assembly most likely. It's hardly likely that something broke while off the car . Also, check the throttle cable, make sure it isn't snagged on anything.

 

[sburna]

I just quickly took a look and the throttle is closed and the cable is not caught on anything. Ill fully check everything when I get back, I'm thinking I didn't tightened the intake manifold properly after putting it back on.
Thanks for the reply, DSMcrazy3.

 

[4UH8ERS]

Since the problem has occured since head removal and timing you have to first assume the problem came from the location you where working on. I believe since you removed both vacuum lines from the valve cover during head removal you might want to start out by checking them for vacuum leaks. I would think you probably pulled a vacuum line on accident while wroking on the car. dont forget to check the cruise control box and control unit.

 

[sburna]

My car didn't come with cruise control ªnd all my vacuum lines were still connected. But after taking the intake manifold off, I noticed the gaskets were not in so good condition and falling apart (being cheap I reused it thinking it was still good instead of buying a new set). So Im waiting for a set ordered from autozone, and hopefully this will fix my problem.
Thanks again.

Update: I just wanted to update for anyone who might come upon this thread with a similar problem.
The cause to my high idle was that I had a vacuum leak at the egr pipe on the intake manifold due to me fogetting to tighten it up after my head job.