Why is my car still idled so high?

Asked by Deemartin44 Mar 31, 2021 at 02:25 PM about the 2004 Cadillac DeVille DTS Sedan FWD

Question type: Maintenance & Repair

What's up everybody... my deville has I high idle
when in park and while driving to where i have to
hold 2 feet on the brake to stop it. I've changed the
IAC and TPS and the car is still doing the same
thing I've checked for leaks and these none .. any
suggestions on what's next?

1 Answer
157,515

James answered 3 years ago

Sounds like a vacuum leak. Check your vacuum hoses and gasket areas around the throttle body and intake manifold. Also check the hoses going to the charcoal canister. For testing purposes unplug the IAC and start the engine. The check engine light will come on, ignore it. With the IAC unplugged you should have a very low idle. If you do, inspect the wires going to the IAC for damage. Hope that helps! Jim

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