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post #1 of 12 (permalink) Old 02-13-04, 02:58 AM Thread Starter
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buzzing sound from motor at idle

Hey everyone

The last few days ive noticed a buzzing sound (thats the best i can describe it - maby a low whistle) coming from the engine bay when the car is idling. As soon as i bring the revs up even a little , it stops. It only does it when its warm.It can be heard in the cabin and has me stumped.

Any ideas guys?

thanks
James


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post #2 of 12 (permalink) Old 02-13-04, 03:22 PM
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Re: buzzing sound from motor at idle

Could be the power steering pump? I know mine makes a bit of a noise if it's idling a bit low.

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post #3 of 12 (permalink) Old 02-13-04, 04:49 PM
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Re: buzzing sound from motor at idle

I'd suggest ISC. Now and again I hear one like this, dunno why Try using a screwdriver as a stethoscope....
Or it could be a vacuum leak. Remember the vacuum is highest with the throttle closed.

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post #4 of 12 (permalink) Old 02-13-04, 11:26 PM Thread Starter
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Re: buzzing sound from motor at idle

thanks for the suggestions guys.

I can cross the ISC off the list because i took it out and it still did it.And its aint the steering pump. Im thinking a vacuum leak - but where do i shart looking for it?

thanks
james

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post #5 of 12 (permalink) Old 02-14-04, 03:47 PM
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Re: buzzing sound from motor at idle

Get a can of cheap degreaser.
While the engine's idling, spray it over the whole intake system, one part at a time, and listen for the idle speed to change.
Don't be afraid to use plenty of it, it sounds like only a small leak so you'll have trouble finding it I imagine....

Oh BTW don't forget the vacuum supply lines for the dash and brake booster.

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post #6 of 12 (permalink) Old 02-14-04, 05:13 PM
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Re: buzzing sound from motor at idle

Brake booster ?

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post #7 of 12 (permalink) Old 02-14-04, 07:57 PM Thread Starter
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Re: buzzing sound from motor at idle

mongrelEB , i dont understand - what will spraying degreaser achieve?

It appears loudest on the extractors side of the engine i must say....

thanks for the reply.

James

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post #8 of 12 (permalink) Old 02-14-04, 08:02 PM
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Re: buzzing sound from motor at idle

Carsik I think he was getting at the fact it might help temp seal up leaks to aid in tracking down where they are.
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post #9 of 12 (permalink) Old 02-16-04, 11:37 PM Thread Starter
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Re: buzzing sound from motor at idle

ok thanks -AL- , ive got a day off this week so ill give it a go....

Now , ive been noticed its getting worse over the last few days , and i must stress it only happens at Idle when warm , never when cold.....would a vacume leak only occur when hot?

james

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post #10 of 12 (permalink) Old 02-16-04, 11:39 PM
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Re: buzzing sound from motor at idle

Yes check the valve near the thermostat, it would open when hot (supposed to be really hot) but the car is old and it may have a leak

I did put something here, but it vanshied, I think

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