change the thermosta on 2004 chevrolet impala bc it was running hot..once i put in a new thermostat now when i cranked it up it is making a high idling noise which i'm scared to drive bc of the noise

5

Asked by Jun 23, 2015 at 03:33 PM about the 2004 Chevrolet Impala Base

Question type: Maintenance & Repair

2 Answers

38,335

Sounds like you may have a bad Idle Air Control valve. Try unplugging your EGR. See if the high idle drops.

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66,065

If it's the 3.8L V6, check your vacuum lines. Make sure that none got broken during the repair and that they're all hooked up correctly. A vacuum leak will cause a high idle and the vacuum hose multi-connector on the intake manifold has to come off to get to the thermostat on the 3.8s. HTH. -Jim

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