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Old 04-14-2015, 12:42 PM #1
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Whining noise
Hello i have a 99 limited 3.4 that has a whining noise after it warms up and is constant under acceleration or throttle. All fluid levels are where they should be. It almost sounds like a PS pump that is running low on fluid but dosnt happen when i turn the wheel. Any help is appreciated.
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Old 04-14-2015, 12:53 PM #2
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You say it's constant, meaning it does not vary with engine rpms?
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Old 04-14-2015, 12:56 PM #3
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It does vary with RPMs i forgot to put that in the OP. At a dead stop and moving also
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Old 07-15-2015, 02:30 PM #4
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Did you ever figure out what this was? Sounds like the same issue I'm having. Sounds just like a power steering pump but that's not the problem. Thanks
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Old 07-15-2015, 02:43 PM #5
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I'm sure it was just him :P

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Old 07-15-2015, 05:14 PM #6
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Alternator?
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Old 07-27-2015, 12:08 PM #7
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update: Still have the issue, it changes with rpm in any gear including park and neutral. Sounds like a p/s pump but it is full of fluid and i just did a transmission filter and drain/refill not flush. It starts after something warms up so im guessing its a seal somewhere that is expanding and leaking. I just sprayed the engine and trans clean with degreaser so if anything is leaking i should see it in the next couple of days.
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Old 07-27-2015, 12:15 PM #8
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Sounds like a transmission pump.
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Old 08-03-2015, 01:59 PM #9
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Update: It was the alternator bearing going. It sounded just like a P/S pump failing and no grinding noise till right before it almost failed.
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