'91 GMC whiny engine


Old 11-02-04, 06:50 AM
Thread Starter
Join Date: Jun 2002
Posts: 54
'91 GMC whiny engine

'91 GMC P/U
About 2 months ago I started noticing a whining or whirring noise coming from the engine compartment. Its a lower pitch noise to begin with, then the pitch increases as the engine rpm's increase. At higher rpm's, it sounds like a sick cat stuck in there. Its hard to tell specifically where the noise is coming from, its either directly out of the engine block, or slightly to the driver's side, possibly the alternator or P/S pump. Do either of these produce this type of noise when they're going bad? Any other ideas what it could be, or how to pin-point the noise?

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Old 11-02-04, 08:00 AM
Join Date: Oct 2004
Location: Ontario
Posts: 539
check the rear bearing in the alternator this is verry commen

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