I hear a knock in Engine - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 10-27-2007, 03:03 AM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Mar 2004
Posts: 70
Thanks: 0
Thanked 0 Times in 0 Posts
dougworner is on a distinguished road
Default I hear a knock in Engine

Bonneville SSE '94 136,000 miles

I've read the other posts on engine knocks but really didn't get much from them. There was one that had a long list of steps to go through to diagnose which I'm not interested in and will just have my mechanic do that if it comes to that.

I'm hearing an engine knock (not real loud, but noticeable) when car is idling and can hear it speed up when step on gas. You cannot hear it when car is at highway speeds (20+ MPH).

Lay it on my straight guys, is this the dreaded valve problem I hear so much about with this engine. Damn I hope not after just shelling out $2400 in a rebuilt transmission.

Please give me good news, but give me honest answer too.
dougworner is offline   Reply With Quote
Old 10-27-2007, 11:43 AM   #2
Senior Member
Certified GM nut
 
Join Date: Feb 2004
Location: CT
Posts: 2,099
Thanks: 0
Thanked 1 Time in 1 Post
SSEBONNE4EVA is on a distinguished road
Default knock

Its not allways in the engine. Check all external mounts, balancers etc first.
http://www.bonnevilleclub.com/forum/...ic.php?t=87748
SSEBONNE4EVA is offline   Reply With Quote
Old 10-27-2007, 12:26 PM   #3
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

What dreaded valve problem? I'm not aware of any.
willwren is offline   Reply With Quote
Old 10-27-2007, 01:40 PM   #4
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Mar 2004
Posts: 70
Thanks: 0
Thanked 0 Times in 0 Posts
dougworner is on a distinguished road
Default

Ok. I've heard from one mechanic that if this engine needs anything after so many thousands of miles it is a valve job. Is this incorrect information Willwren?
dougworner is offline   Reply With Quote
Old 10-27-2007, 01:44 PM   #5
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Not at all. I can't even think of the last time I've heard of a valve job unless it was purely for performance. Your mechanic obviously isn't very knowledgable about your motor, or he'* confused it with something else.
willwren is offline   Reply With Quote
Old 10-27-2007, 02:40 PM   #6
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Mar 2004
Posts: 70
Thanks: 0
Thanked 0 Times in 0 Posts
dougworner is on a distinguished road
Default

Willwren. This particular guy wasn't my mechanic.

I'll make an appt. to have this looked at.
dougworner is offline   Reply With Quote
Old 10-27-2007, 05:40 PM   #7
Junior Member
 
Join Date: Aug 2005
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
wjcollier07 is on a distinguished road
Default

These are extremely reliable engines, especially the series one L27. Most last several hundred thousand miles with normal maintenance before needing any overhaul service, and even then, valves aren't an issue.

A knock? Maybe a tick? Possibly a clicking? Is there any way you could get a sound clip of this knock? Or at least isolate the sound to one general area? These engines are not completely silent either, they have their own sounds, small ticking noises and such. Is this a new noise? If you place your hand on the intake plenum while the car is running, can you FEEL the noise?
wjcollier07 is offline   Reply With Quote
Old 10-27-2007, 08:05 PM   #8
Senior Member
Certified GM nut
 
Join Date: May 2005
Location: Wickliffe, Ohio
Posts: 2,155
Thanks: 0
Thanked 0 Times in 0 Posts
McGrath is on a distinguished road
Default

My old L67 when it first started to knock

I heard my L32 start to knock a few nights ago too. As I remember it bottom end knocks are much slower in speed then a valve train knock. It'* been a few weeks since I heard a collapsed lifter though (3.8L w-body.)

Ed
McGrath is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Hear Ye, Hear Ye Village Idiots Mike Lounge 16 09-16-2006 08:17 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
KR without Knock> Not even false knock? streetracer Performance, Brainstorming & Tuning 1 08-18-2003 02:08 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 11:09 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.