Re: 2004 Cavalier P0455 code - engine revving
OK, here's the update to my revving problem.
After reading posts on this site and several others out there I decided to pull out the Idle Air Control valve (IAC). This took about 15 minutes and could have been done much faster if I hadn't had to search for some of my tools.
The valve looked a bit carboned up. So, I let it soak in some intake cleaner and, after cleaning it off as best I could, replace it.
Everything seemed OK for about a day and then I revved again at idle, and the RPMS went up to about 2,500.
So, I decided to bite the bullet and buy a new IAC at the dealer. Cost about $175 CDN. Upon receiving the new part it was clear that the original had a problem, in that the new one had it's "plunger" out nearly a centimetre more.
I took the tools I knew I needed to do the "remove and replace" with me and did the part swap in the parking lot of the dealer. Total time here: 6 minutes. (Mind you, this time I know what I was doing and didn't have to hunt for any tools).
That was more than two weeks ago -- and the car has been just fine since then. No more high revving at idle.
The problem was, clearly, the Idle Control Valve.
The error code I mentioned in my original post appears to have been due to a gas tank cap been loose, theby allowing the "gross leak".
I hope this helps someone.....
Jeff
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