Loud foghorn noise when idle

bkeech · 03-13-2011, 05:00 PM

Hi,

Have a 2004 Mazda MPV that has a loud foghorn noise when idle. I tried spraying the fan belts, changed the water pump, and tried a new IAC but no luck. Any other ideas?

Thanks

Mort · 03-27-2011, 09:43 PM

In my 10+ years in the auto industry, I've learned one (and only one) thing: Noises are impossible to diagnose unless you hear them. A mechanic, or at very least, an experienced parts-guy (not a yutz working at O'Reilly's) would be able to help you whilst standing right next to it (not over the phone). That's the best advice I can give you, kimosabe.

bkeech · 03-27-2011, 09:47 PM

Thanks.

I took it in and they found the cause was a vacuum hose.

Mort · 04-02-2011, 11:03 AM

Sweet, glad it was something cheap.