Loud horn sound coming from engine are.

Asked by Charles Jan 14, 2017 at 10:20 PM about the 2005 Chevrolet Impala LS FWD

Question type: Maintenance & Repair

My car is making a horn like noise by the engine when
idle, once i accelerate the noise goes away.

2 Answers
445

Nautica85 answered 7 years ago

your alternator belt is letting you know that it needs to be changed very soon sometimes they call it the serpentine belt..

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160

kmcgmc answered 7 years ago

If it whistles continuously except upon acceleration, it is a the EGR valve. I had this problem on my VW Passat (2006) and there was a recall for the plastic part that failed. Upon opening the hood, you will know if it is a belt or a whistling relating to the intake. Belts squeal, and the weird EGR valves that fail make the most annoying sound in the world.

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