 Name That Noise, Help me diagnose an odd noise on an old car |
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 Jan 19 2011, 04:01 PM
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Experienced Member  Group: Advanced Members Posts: 1,197 Joined: 13-February 04 From: Hudson, Colorado Member No.: 197  |
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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Jan 20 2011, 05:43 PM
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#2
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Full NVH Group: Moderators Posts: 444 Joined: 16-July 07 From: Grove City, Ohio Member No.: 1,854 |
The 440-T4 has a drive chain and Torrington bearings that are notorious for that type of noise. I would want to drive it before I condemmed it, or you you try to record the noise and send me the file. Wheel bearings will start as soon as the car moves, and I have seen situations where they only make noise in a straight line. Wish you were closer........
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Posts in this topic
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 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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