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Old December 14th, 2004, 08:05 PM
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Jon Strong
Join Date: Mar 2004
Location: Pennsville NJ USA
Posts: 98
whistling noise from engine

I'ts been happening for a few weeks now, only noticed it at cold temps, but now its happening at running temp.

Basically, when letting off the accl to slow down, the engine starts to make a whistling noise, and will continue while at idle. The noise stops when I rev the engine slightly, and begins again when I left off the accl.

When getting up to speed, the noise isn't noticed except during shifts , then begins any time I let off the accl.

Does not make any noise at cruise speed.

I replaced the air filter when i first noticed it, but made no change.

I've looked for loose or broken vacc. lines, but I don't see any.

Thoughts ??



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Old December 14th, 2004, 08:13 PM
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Hans Haase
The D-90.com Lab Rat
Join Date: Oct 2003
Location: Long Island, NY
Posts: 2,385
Alternator bearing? Power Steering pump?

My oil line fix

My 100k stopped odometer fix

Brace for impact, I'm in a "modifying mood". Massive thread count inbound.
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Old December 14th, 2004, 11:37 PM
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Chris Davis
94 D90, 88 RRC
Join Date: Nov 2003
Location: Colorado
Posts: 2,106
The cool thing about the 94's is that you have a different belt for everything. Disconect belts independantly to find the problem. Use choke cleaner and spray around the engine compartment when idleing--if the idle increases, then you have a vaccum leak--but that is not what is causing the whistling--it is coming from a bearing more likely than not. Probably the alternator or the tensioner
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