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> Name That Noise, Help me diagnose an odd noise on an old car
00 SS
post Jan 19 2011, 04:01 PM
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I have an old Buick I use as a daily driver. It's an '88 Park Ave, FWD 3.8 V6, 4 speed auto. It's made an odd noise on the way in to work this morning that I can't pin point. The noise sounds like a VERY bad PS pump, you know the whine I'm talking about. It's not the PS pump, I can hear it as well as the noise in question at the same time on occasion. The noise only happens when the car is moving. The noise stops when the car comes to a COMPLETE stop, at a 1-2 MPH roll, it's still there. Also, it seems worst rolling in a straight line. Turning seems to make the noise go away, at least momentarily but not always. The noise seems to get louder the slower the goes but does not seem to change pitch with speed. The brake pedal does not affect the noise, it's the same on or off the brakes.

The front brakes were new a couple months ago and I replaced the right half shaft about 4 months ago. PS pump and harmonic balance were replaced at the same time as the half shaft. Everything else looked fine at the time I worked on it.

Since I'm in the office all day and can't go look at it until this evening, I'm stuck speculating. If you're anyting like me, you know how much it will bug me until I figure out what it is. I'm a bit stumped. Any ideas?
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rocky
post Jan 19 2011, 06:54 PM
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Hmm. I think I would need a test drive to help any further, but Colorado is a little far. I would try what Gene and I have suggested when you get home. It should narrow down the possibilties. Besides it a good opportunity to check out all the steering and suspension while you have it in the air. And I am not sure but doesn't that tranny have a drive chain? That was what I was thinking when I said possible tranny problem
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00 SS   Name That Noise   Jan 19 2011, 04:01 PM
rocky   So it is speed related? Start with the obvious, hu...   Jan 19 2011, 04:31 PM
00 SS   I was thinking possibly front hub/bearings myself....   Jan 19 2011, 04:42 PM
00 SS   Just went down and checked the fluid levels. Tran...   Jan 19 2011, 05:29 PM
CrashTestDummy   I'd be looking at that other half-shaft, or bo...   Jan 19 2011, 06:26 PM
rocky   Hmm. I think I would need a test drive to help any...   Jan 19 2011, 06:54 PM
00 SS   I have no clue if there is a chain in that tranny ...   Jan 19 2011, 07:36 PM
CrashTestDummy   I believe they do, but that ties the flywheel to t...   Jan 19 2011, 08:50 PM
00 SS   Wouldn't you know it? The day I need to work ...   Jan 20 2011, 01:10 AM
Todd   I had an 89 LeSabre beater so I'm familiar wit...   Jan 20 2011, 02:20 PM
00 SS   The mystery continues. With the short but nasty l...   Jan 20 2011, 03:32 PM
CrashTestDummy   All that snowmelt leaking into the front wheel bea...   Jan 20 2011, 04:37 PM
Racerdad916   The 440-T4 has a drive chain and Torrington bearin...   Jan 20 2011, 05:43 PM
00 SS   Because it ONLY made noise with the car in motion,...   Jan 20 2011, 05:51 PM
Racerdad916   that's where I would start as well...... let m...   Jan 20 2011, 06:03 PM
cozog   What about in reverse... is the noise still there?   Jan 21 2011, 12:54 AM
00 SS   The mystery deepens. Reverse? Don't know, ne...   Jan 22 2011, 03:29 AM
rocky   Did you get it fixed?   Jan 25 2011, 01:41 AM
00 SS   It would seem to be fixed, the noise did not occur...   Jan 25 2011, 02:19 AM
rocky   I know what you mean. I hope it stays fixed   Jan 25 2011, 03:01 AM

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