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Whine in engine


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plkelly
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Sep 11, 2011, 3:49 PM

Post #1 of 8 (2292 views)
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I havean 04 Trailblazer w/4.2. I have an engine whine that sounds electrical. I am a retired auto mechanics teacher, current ASE certified. I repalced the alternator because it definately sounded like it was coming from the alternator. I used a stethescope to listen to the whole engine. The whine increases with acceleration. It has a new belt and battery. Fan clutch engagement does not affect the noise. Water pump seems to be tight and its not overheating or throwing any codes. As I said, it sounds 100 % electrical. Car runs fine. Since it has the serpantine belt, I can not remove belts too eliminate the noise. The PS pump is quiet. I couldn't find any TSBs on it. Any ideas?


(This post was edited by plkelly on Sep 11, 2011, 4:12 PM)


Discretesignals
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Sep 11, 2011, 3:51 PM

Post #2 of 8 (2290 views)
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Re: Whine in engine [In reply to] Sign In

If you unplug the alternator's electrical connector, does the whine go away?

Since you are a retired automotive instructor are you testing us?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Sep 11, 2011, 3:58 PM)


plkelly
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Sep 11, 2011, 4:11 PM

Post #3 of 8 (2271 views)
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Re: Whine in engine [In reply to] Sign In

I am not testing you. I have never had a problem like this that seems to defy all logic. The noise does not go away when unplugging the alternator. Any other ideas?


re-tired
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Sep 11, 2011, 7:23 PM

Post #4 of 8 (2245 views)
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Re: Whine in engine [In reply to] Sign In

Try unplugging the electric air pump before starting engine.,


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Hammer Time
Ultimate Carjunky / Moderator


Sep 11, 2011, 7:24 PM

Post #5 of 8 (2245 views)
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You should be able to remove the belt at least long enough to see if the noise is still there or not so you will know for sure if it is a belt driven component or not. It's probably an idler pulley, tensioner pulley or something like that.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Sep 11, 2011, 7:32 PM

Post #6 of 8 (2240 views)
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Re: Whine in engine [In reply to] Sign In

I agree with HT. You should be able to remove the drive belt. There were a couple of hits on IATN for the fan clutch making a whining noise. They had a TSB on the fan clutch wiring harness chaffing (TSB 05-06-02-012B).

Did you scan the PCM for trouble codes? If so, what is being stored? If you have a scan tool with bidirectional control, you can command the fan clutch to check its operation and to see if the noise changes.

I thought about the AIR pump too, till he/she stated that the whine noise increases with engine rpm.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Sep 11, 2011, 7:38 PM)


plkelly
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Sep 11, 2011, 9:15 PM

Post #7 of 8 (2226 views)
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Re: Whine in engine [In reply to] Sign In

Worth a try.


plkelly
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Sep 11, 2011, 9:18 PM

Post #8 of 8 (2224 views)
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Re: Whine in engine [In reply to] Sign In

No PCM codes. Don't have a sophisticated scanner. I might borrow one. Thanks




Whine in engine


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