Knock - 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 04-28-2003, 04:51 PM   #1
Senior Member
Certified GM nut
Thread Starter
 
Join Date: Apr 2003
Location: Davison,Michigan
Posts: 1,867
Thanks: 0
Thanked 0 Times in 0 Posts
russianpolarbear is on a distinguished road
Default Knock

I have a 1993 Pontiac Bonneville 3800 S1 and its a little loud. Okay 3 things are wrong with it.
1: It has a medium loud knock when I start it up but when it heats up it goes away.
2: If im going 35-45mph and gas it to get to express way speed it studders sometimes , like its really trying to go but exceling really slow.
3: Its a 93 and I havent changed the fuel filter 138000 on the car.

Any facts or ideas? I have a hunch but want others opinions before I jump on in.
russianpolarbear is offline   Reply With Quote
Old 04-28-2003, 06:33 PM   #2
Senior Member
Posts like a Turbo
 
Join Date: Mar 2003
Location: Montana
Posts: 301
Thanks: 0
Thanked 0 Times in 0 Posts
LowLyfe83 is on a distinguished road
Default

Deffinately change the fuel filter then. im not sure how many miles a person can before a change but they are cheap and not too hard to replace. im no mechanic but from my experiences, a new filter will do nothing but good for your car.
LowLyfe83 is offline   Reply With Quote
Old 04-28-2003, 09:33 PM   #3
Senior Member
True Car Nut
 
Join Date: May 2002
Location: Edmonton, AB Canada
Posts: 2,621
Thanks: 0
Thanked 0 Times in 0 Posts
DeathRat is on a distinguished road
Default Re: Knock

Quote:
Originally Posted by russianpolarbear
I have a 1993 Pontiac Bonneville 3800 S1 and its a little loud. Okay 3 things are wrong with it.
1: It has a medium loud knock when I start it up but when it heats up it goes away.
2: If im going 35-45mph and gas it to get to express way speed it studders sometimes , like its really trying to go but exceling really slow.
3: Its a 93 and I havent changed the fuel filter 138000 on the car.

Any facts or ideas? I have a hunch but want others opinions before I jump on in.
Well for number one, first try to dettermine where the "knock" is coming from, my guess is the lower end.
Question number two: Check for any driveline codes like TCC solinoid or Shift Solinoids.
Question number three: Change that Fuel filter ASAP!
DeathRat is offline   Reply With Quote
Old 04-29-2003, 01:01 PM   #4
Senior Member 8-16-02
Posts like a Northstar
 
Join Date: Aug 2002
Posts: 529
Thanks: 0
Thanked 0 Times in 0 Posts
complinitor is on a distinguished road
Default

If the knock goes away when the engine warms up, it'* a good chance that you have a lifter starting to fail. These engines use a hydraulic roller lifter and when they start to fail, the oil cannot pump up the lifter as fast as it used to do. It will be ok for a while, but don't beat on the car. This is only an experienced guess, have a shop look at it, one you can count on.

The stuttering may be from the fuel filter, clogged and not giving the engine the fuel it requests. It could be a host of other thing, but start with the basics. Do a full tune-up (plugs, wires, fuel filter, air filter, pcv), then see where you are at with the hesitation.
complinitor is offline   Reply With Quote
Old 04-29-2003, 10:18 PM   #5
Senior Member
Certified GM nut
Thread Starter
 
Join Date: Apr 2003
Location: Davison,Michigan
Posts: 1,867
Thanks: 0
Thanked 0 Times in 0 Posts
russianpolarbear is on a distinguished road
Default

Could I pull the lifter out myself and clean it up or is it a hard job on the 3800 to get to the lifter...
russianpolarbear is offline   Reply With Quote
Old 04-30-2003, 01:53 AM   #6
Senior Member 8-16-02
Posts like a Northstar
 
Join Date: Aug 2002
Posts: 529
Thanks: 0
Thanked 0 Times in 0 Posts
complinitor is on a distinguished road
Default

It'* not a hard job, just time consuming, especially for your first time doing this kind of work. You'll need to replace the lifter; it can't be cleaned. I would suggest that you replace all of the push rods and lifters at one time...saves the headaches later. The intake manifold come off, as well as the valve covers and a few other things. Either the Chiltons or the Haynes books can give you the complete know-how on this. If you don't have one, get one. It'll help you in the long run.
complinitor is offline   Reply With Quote
Old 04-30-2003, 01:15 PM   #7
Senior Member
Certified GM nut
Thread Starter
 
Join Date: Apr 2003
Location: Davison,Michigan
Posts: 1,867
Thanks: 0
Thanked 0 Times in 0 Posts
russianpolarbear is on a distinguished road
Default

Yeh I have a book but I have done it before just not on this engine because on alot you can remove the rocker accembly then pull the rods out then you can just life out the lifters.. is that a possibility?
russianpolarbear is offline   Reply With Quote
Old 05-01-2003, 12:37 AM   #8
Senior Member 8-16-02
Posts like a Northstar
 
Join Date: Aug 2002
Posts: 529
Thanks: 0
Thanked 0 Times in 0 Posts
complinitor is on a distinguished road
Default

Almost, you've got to remove the upper and lower intake manifolds, as well. That'* the pain. Change your intake gaskets at this time. You'll be better off in the long run.
complinitor is offline   Reply With Quote
Old 05-01-2003, 02:22 AM   #9
Senior Member
Certified GM nut
Thread Starter
 
Join Date: Apr 2003
Location: Davison,Michigan
Posts: 1,867
Thanks: 0
Thanked 0 Times in 0 Posts
russianpolarbear is on a distinguished road
Default

Why what does the intake manifold do to get in the way?
russianpolarbear is offline   Reply With Quote
Old 05-01-2003, 02:41 PM   #10
Senior Member 8-16-02
Posts like a Northstar
 
Join Date: Aug 2002
Posts: 529
Thanks: 0
Thanked 0 Times in 0 Posts
complinitor is on a distinguished road
Default

The lifters are located under the intake manifold. Once the 2 parts are removed, you'll see them right away. The pushrods run high in the heads and the lifters are actually located in the block. They have a retaining bar that holds them in place. Check that for wear - if a lifter is loose, that could be part of the problem.
complinitor is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
knock knock knock L27Buick 1992-1999 7 09-17-2004 04:23 PM
Knock Knock continued (spun bearing) Spiral 1992-1999 5 05-25-2004 09:57 AM
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 06:00 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.