Excessive underhood noise. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Closed Thread
 
 
 
Thread Tools Search this Thread
Old 06-04-2007, 10:22 AM   #1
Junior Member
Thread Starter
 
Join Date: Apr 2006
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Bonneville92V688 is on a distinguished road
Default Excessive underhood noise.

Ok, I knew this was a problem before I bought the car, but there was a lot of underhood noise, mostly a annoying clattering sound. Well this morning I removed both drivebelts and ran it for a few seconds. The sound is still there. Would anyone say that the sound is most likely the HB? It does go away upon revving/acceleration, and I know it isn't engine noise, as it doesn't sound like engine noise. Anyone?
Bonneville92V688 is offline  
Old 06-04-2007, 10:28 AM   #2
Senior Member
Posts like a Turbo
 
Join Date: Oct 2006
Location: Whitewater, Wisconsin
Posts: 319
Thanks: 0
Thanked 0 Times in 0 Posts
nicklikesmilk is on a distinguished road
Default

search old topics on the harmonic balancer, i do believe they said something about it going away under acceleration. but look first, i could very well be wrong
nicklikesmilk is offline  
Old 06-04-2007, 10:54 AM   #3
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

I'm going to be technical here.

An engine noise should be any noise coming from any part of the engine. Understanding what you mean...(if I'm right) you mean..it'* not an internal engine sound, like a bearing or lifter etc.

Could the noise the be exhaust manifold that is cracked?
Have you visually inspected the face of the balancer?
BillBoost37 is offline  
Old 06-04-2007, 11:09 AM   #4
Junior Member
Thread Starter
 
Join Date: Apr 2006
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Bonneville92V688 is on a distinguished road
Default

Yeah, I was actually going out right now to inspect the face of the balancer. I am really just hoping it is the balancer.
Bonneville92V688 is offline  
Old 06-04-2007, 11:42 AM   #5
azu
Senior Member
Posts like a Turbo
 
Join Date: Apr 2007
Location: Sellersville, PA
Posts: 254
Thanks: 0
Thanked 0 Times in 0 Posts
azu is on a distinguished road
Default

I had same noise with mine and it was the harmonic balancer. I could tug on the belt and the balancer would move a few inches.Since you have the belt off just see if you can move the balancer by hand. If it'* bad it will move an inch or two. Also the noise will go away at higher rpms which is a clue that is is the hb.
azu is offline  
Old 06-04-2007, 11:44 AM   #6
Junior Member
Thread Starter
 
Join Date: Apr 2006
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Bonneville92V688 is on a distinguished road
Default

Here is the video, and oddly, it doesn't sound like HB noise. Yes there is a clattering, but that is the SC coupler. But with the belts off, noise is def. present.

http://s102.photobucket.com/albums/m...t=HPIM0612.flv
Bonneville92V688 is offline  
Old 06-04-2007, 12:00 PM   #7
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

Can you move the outside of the HB without the inner hub moving?
J Wikoff is offline  
Old 06-04-2007, 01:52 PM   #8
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

I skipped right past the vid...right past the rest.

Pinks... What does the face of the balancer tell you? Is it time to buy one or keep looking for other noises?

Let'* rule out the items one by one instead of guessing at what the noise in the vid is..
BillBoost37 is offline  
Old 06-04-2007, 02:03 PM   #9
Member
Posts like a V-Tak
 
Join Date: Mar 2007
Location: NorthWest WI
Posts: 44
Thanks: 0
Thanked 0 Times in 0 Posts
Lee_Mur is on a distinguished road
Default

I've had my 95 Non supercharged for about 6 months. When started cold it has a sound from the ar cleaner that sounds like the bearings are going out. With the new cold air intake you can really hear it. Once the motor warms up the sound is gone, motor nearly silent.

Is your sound still there after driving awhile? Does it only go away when accelerating or revving?
Lee_Mur is offline  
Old 06-04-2007, 03:01 PM   #10
Senior Member
Certified Car Nut
 
Join Date: Oct 2002
Posts: 11,307
Thanks: 0
Thanked 0 Times in 0 Posts
bonnie94ssei is on a distinguished road
Default

I'm with Bill, if the face of the HB is torn, replace it. If it'* not torn it'* not going to clatter ridiculously (like mine did). I couldn't hear any HB clattering in that video, nothing even close to what I had anyway. Though it was spinning, I couldn't see anything that looked torn on the HB.
bonnie94ssei is offline  
 
 
Closed Thread

Related Topics
Thread Thread Starter Forum Replies Last Post
want an underhood light?? corvettecrazy Lounge 11 02-27-2006 08:31 AM
Painting Underhood Plastic Parts lash Detailing & Appearance 8 12-21-2005 08:51 PM
Underhood detailing/ what are the tricks? jkust Detailing & Appearance 4 08-07-2005 03:32 AM
HELP...underhood explosion on 97 SE mike97se 1992-1999 14 03-14-2004 01:00 PM
New underhood pics......with laser engraving willwren Your Ride: GM Pictures & Videos 62 09-20-2003 03:39 AM


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 02:07 PM.


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.