Strange buzzing noise - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-12-2007, 01:21 AM   #1
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Jan 2003
Location: Jenison, MI (Near Grand Rapids)
Posts: 1,070
Thanks: 0
Thanked 0 Times in 0 Posts
theJMFC is on a distinguished road
Default Strange buzzing noise

Long time-no post, but my '98 has been making an odd noise for about a month or two now, and I really can't seem to place it.

It started one snowy day, pulling out of work. Out of nowhere, there was a buzzing at low speed while accelerating. Seems to be coming from the Driver'* side engine/transmission area. It comes and goes, not all that consistent. It does mostly do it at low speed, while accelerating, but it will also sometimes make the noise, more quietly, at a steady state speed. Rarely it has done it at idle, in park. Sadly I was not under the hood at the time though.

I should also note that the vibration/buzzing changes in speed to match the engine RPM.

It almost sounds like a heat shield vibrating against something. While I haven't been under the care in a while due to the crappy Michigan winter, I don't think it'* actually a heat shield. Too dependent on engine load and RPM, I think.

A quick look under the hood showed nothing out of place.

I'm wondering if it might be something inside of the bellhousing area, or the torque converter. Do they ever make a noise like that?

As always, any thoughts are appreciated.
theJMFC is offline   Reply With Quote
Old 03-12-2007, 11:16 PM   #2
Senior Member
Posts like a Corvette
 
Ol' Timer's Avatar
 
Join Date: Oct 2002
Location: New Jersey - Most of Our Elected Officials Have Not Been Indicted
Posts: 1,483
Thanks: 0
Thanked 0 Times in 0 Posts
Ol' Timer is on a distinguished road
Default Re: Strange buzzing noise

Quote:
Originally Posted by theJMFC
It almost sounds like a heat shield vibrating against something. While I haven't been under the care in a while due to the crappy Michigan winter, I don't think it'* actually a heat shield. Too dependent on engine load and RPM, I think.
I would still vote for the Cat Heat Shield. I would put the car up on some ramps and start the car up in the morning when the engine is COLD. You should be able to better locate the source then,
Ol' Timer is offline   Reply With Quote
Old 03-13-2007, 02:04 AM   #3
Junior Member
Posts like a Ricer Type-R
 
Join Date: Mar 2007
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
redlobster is on a distinguished road
Default what vacuum line is this?

sorry accidental post
redlobster is offline   Reply With Quote
Old 03-13-2007, 04:07 PM   #4
jdq
Senior Member
Posts like a Corvette
 
Join Date: Nov 2005
Location: Hamilton, Ontario , Canada
Posts: 1,201
Thanks: 0
Thanked 0 Times in 0 Posts
jdq is on a distinguished road
Default

My manifold shield came apart at the welds and was doing that, it actually dropped an inch and was just sitting there.
jdq is offline   Reply With Quote
Old 03-14-2007, 12:51 AM   #5
Senior Member
True Car Nut
 
Join Date: Sep 2006
Location: Bloomington, MN
Posts: 3,693
Thanks: 0
Thanked 0 Times in 0 Posts
GoldenBullet is on a distinguished road
Default

i have a rattle/ buzzing too that seems to be coming from under the hood, im almost positive it is a heat shield and i will be looking into it shortly, but my guess is that that is your problem.
GoldenBullet is offline   Reply With Quote
Old 03-14-2007, 11:50 PM   #6
Member
Posts like a V-Tak
 
Join Date: Aug 2005
Location: El Torito, CA
Posts: 98
Thanks: 0
Thanked 0 Times in 0 Posts
MartyC is on a distinguished road
Default

I'd check the heat shield on the 'cat' too. Mine lost a few tack welds (on the truck) and I drilled it through the flange and stuck a #10 screw through it with a split washer and double nuts. It lasted nearly two years before it wiggled loose again. The gap between metal pieces doesnot have to be very big for it to rattle.
MartyC is offline   Reply With Quote
Old 03-15-2007, 04:23 AM   #7
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Jan 2003
Location: Jenison, MI (Near Grand Rapids)
Posts: 1,070
Thanks: 0
Thanked 0 Times in 0 Posts
theJMFC is on a distinguished road
Default

Sorry to start a topic and seemingly abandon it, but I got sick, got busy, and just now finally got back to reading responses.

Thanks to all who did respond...

I can rule out the heat shield on the cat itself. That fell off a couple years ago. I don't park over dry leaves anymore...

As for the heat shield above the cat though, I will have to check it the next warm day we get.

I do hope it'* just a heat shield! My gut was telling me that it was something more mechanical, but my guts have been off lately anyway. I just can't think of anything specific that would make that noise, other than a heat shield. Which would seem to argue for it BEING the heat shield, but it just sounds so ... not like a heat shield sometimes, I remain unconvinced that it is, until I'm able to crawl under there and see.

That said, my wife has been driving the car for the past few days, and she claims not to have heard any such noise. It'* been unseasonably warm, so maybe it'* slightly cold-related? Winter is back for this weekend, so I guess we shall see.

I'll update with what I find, when I find it.

Thanks again.
theJMFC is offline   Reply With Quote
Old 03-22-2007, 10:42 PM   #8
Senior Member
Posts like a 4 Banger
 
chemicall's Avatar
 
Join Date: Feb 2007
Location: Canada, eh!
Posts: 112
Thanks: 0
Thanked 0 Times in 0 Posts
chemicall is on a distinguished road
Default

my rear manifold heatshield was broken at the welds and just sitting there making a rattle when sitting in the driveway idling and going down the road...
chemicall is offline   Reply With Quote
Old 03-23-2007, 02:44 AM   #9
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Jan 2003
Location: Jenison, MI (Near Grand Rapids)
Posts: 1,070
Thanks: 0
Thanked 0 Times in 0 Posts
theJMFC is on a distinguished road
Default

Well.... The noise is gone for now. Strange, but true.

I guess I'll just forget about it until/unless it comes back.

I love it when problems just go away.

Thanks again.
theJMFC is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Startup Buzzing Noise? Spl170s 2000-2005 1 04-24-2008 04:29 PM
Subs are buzzing... SSEi95 Audio (and aftermarket electronics) 20 06-11-2005 01:27 AM
plastic buzzing from 2002 sle over bumps glorenzen Introductions for new members 3 03-02-2005 06:17 PM
Strange Buzzing noise in 00 SSEI bonneville 00 2000-2005 6 01-10-2005 01:40 AM
Buzzing and rattling from rear speakers karfreek Audio (and aftermarket electronics) 0 06-30-2004 10:28 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:39 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.