1989 bonneville LOUD knock - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Pontiac When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 01-29-2011, 11:09 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
gollum244's Avatar
 
Join Date: Jul 2009
Location: Calgary
Posts: 50
Thanks: 0
Thanked 0 Times in 0 Posts
gollum244 is on a distinguished road
Default 1989 bonneville LOUD knock

Hey guys, well after a long absence ive returned with some news and questions on the old gold SSE. way back when i was forced to park it after i encountered some pretty audible valve noise. fearing the worst, i promptly took it home, and pulled the valve covers to see if i could locate the issue. after no success i tried starting her up again, at which point i get a series of loud bangs and knocks while it tried to hold idle for roughly 10 seconds before dying.

Since then ive managed to pull the valve covers again, and pull all of the rockers and push rods for some in depth searching...kind of. I still have no idea whats wrong with her, especially since im afraid to start her up again, in case ive really blown something important.

now im thinking, i can see down into the pushrod holes, and the lifters all seem fine, but is it possible i could have squared one off, or otherwise damaged it? would it help my case if i removed the intake manifold and pulled them all out for a close inspection? beyond that, with the noise i heard last time she ran, is it possible i could have thrown a piston rod?

i can post pictures of the teardown and parts if you want.
gollum244 is offline   Reply With Quote
Old 01-29-2011, 11:13 PM   #2
Senior Member

True Car Nut
 
sseidriver97's Avatar
 
Join Date: Mar 2010
Location: Portage mi
Posts: 7,124
Thanked 3 Times in 3 Posts
sseidriver97 is on a distinguished road
Default

Pull one of the heads will give you a good veiw of the valves and pistons also to determine if you have any serious damage also drain some oil and check for metal shavings
sseidriver97 is offline   Reply With Quote
Old 01-30-2011, 12:05 AM   #3
Senior Member
True Car Nut
 
raptor660's Avatar
 
Join Date: Mar 2010
Location: Eaton Rapids MI
Posts: 2,964
Thanks: 0
Thanked 0 Times in 0 Posts
raptor660 is on a distinguished road
Default

Yikes! Yup.. time to delve a little deeper into the motor
raptor660 is offline   Reply With Quote
Old 01-30-2011, 12:07 AM   #4
Senior Member

True Car Nut
 
sseidriver97's Avatar
 
Join Date: Mar 2010
Location: Portage mi
Posts: 7,124
Thanked 3 Times in 3 Posts
sseidriver97 is on a distinguished road
Default

forgot to add if you put a stronger magnet near your drain plug for a few days then before checking the oil Via drain plug take it off and any metal shavings should be right there and come out quick
sseidriver97 is offline   Reply With Quote
Old 01-30-2011, 02:07 AM   #5
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Damage to the lifters is small, these engines have roller lifters. As for the loud bang, I would pull the spark plugs and inspect them for damage. If you find a smashed plug, then get a borescope, you may have chipped a piston.
Danthurs is offline   Reply With Quote
Old 01-30-2011, 10:42 AM   #6
Member
Posts like a V-Tak
Thread Starter
 
gollum244's Avatar
 
Join Date: Jul 2009
Location: Calgary
Posts: 50
Thanks: 0
Thanked 0 Times in 0 Posts
gollum244 is on a distinguished road
Default

These are all awesome ideas, Thanks guys! I have to go to work, but ill start by pulling the plugs and applying a big magnet when i get home. a large sub would do the trick eh?
gollum244 is offline   Reply With Quote
Old 01-30-2011, 03:24 PM   #7
Senior Member

True Car Nut
 
sseidriver97's Avatar
 
Join Date: Mar 2010
Location: Portage mi
Posts: 7,124
Thanked 3 Times in 3 Posts
sseidriver97 is on a distinguished road
Default

Yeah lol i usually drag it around the entire pan in a wax on wax off motion and make my way back the the drain plug
sseidriver97 is offline   Reply With Quote
Old 01-30-2011, 11:00 PM   #8
Member
Posts like a V-Tak
Thread Starter
 
gollum244's Avatar
 
Join Date: Jul 2009
Location: Calgary
Posts: 50
Thanks: 0
Thanked 0 Times in 0 Posts
gollum244 is on a distinguished road
Default

well, pulled all of the plugs, and ive got no physical damage, alot of spacing between the electrodes. although that just might be me. checked the gap, came out to an average of .060". i also left a speaker on the oil pan, and ill check that in a couple days.

Now into a bit of crude diagnostics here. with all of the spark plugs in generally operable condition, can i rule out piston head damage and/or connecting rod failure. OR would it still be a good idea to get a hold of a borescope, and shove er down the spark plug hole to see whats going on?

Keeping in mind that im trying NOT to remove the heads if i dont have to (its just something i dont want to do) once i drain the oil, and look for shavings, even if i dont find any metal in the oil, could i remove the baffle (if it exists) and look at the connecting rods from below, and then source out a borescope from someone else to see the top of the pistons?
gollum244 is offline   Reply With Quote
Old 01-30-2011, 11:05 PM   #9
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Not having a damaged spark plug don't rule out a chipped piston. But generally chipping it will smash the plug. If you have access to a borescope, I would still check. If you find metal shavings in the oil, it'* a good chance you spun a bearing. Only way to check this is to drop the pan and visually inspect them.
Danthurs is offline   Reply With Quote
Old 02-09-2011, 05:30 PM   #10
Member
Posts like a V-Tak
Thread Starter
 
gollum244's Avatar
 
Join Date: Jul 2009
Location: Calgary
Posts: 50
Thanks: 0
Thanked 0 Times in 0 Posts
gollum244 is on a distinguished road
Default

Just sitting in class and ive had what could be considered a brainwave. could i remove the lifters with a magnet thus eliminating the need to remove the intake manifold?
gollum244 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
civic loud knock and massive vibrations. eltatertoto Your Other Rides: Pics & Videos 9 03-14-2013 07:21 AM
How loud is KR? [Updated: Answer: Not louder than rod knock] xX1SSEI1Xx 2000-2005 14 01-14-2008 06:08 PM
knock knock knock L27Buick 1992-1999 7 09-17-2004 04:23 PM
Knock Knock, engine knock? Spiral 1992-1999 5 05-23-2004 10:08 PM
Knock Knock Tamara 1992-1999 11 01-31-2003 05:26 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 10:43 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.