Intermittend Engine Rattle - 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 06-08-2005, 09:09 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Feb 2005
Location: arkansas
Posts: 38
Thanks: 0
Thanked 0 Times in 0 Posts
psycho_72653 is on a distinguished road
Default Intermittend Engine Rattle

Anybody ever run into an intermittend rattle in the early Vin L 3800 (this is a '94), it shows up only in gear and under acceleration, even then only between 1500-2000 and 2700-3000 rpm'*, it'* a little worse when cold, oil pressure runs about 40 psi while driving and drops to 20 at idle when warm, it has no noise at idle in park or in gear....car has 134k and has been well maintained.

Any suggestions would be helpful.
psycho_72653 is offline   Reply With Quote
Old 06-08-2005, 10:14 PM   #2
Senior Member
True Car Nut
 
Join Date: Nov 2002
Location: Texarkana, Texas
Posts: 6,041
Thanks: 0
Thanked 0 Times in 0 Posts
Damemorder is on a distinguished road
Default

I'm pushing 62psi at idle so I'd call your psi'* low, although within spec.

Sounds ignition related. Pinging?
Damemorder is offline   Reply With Quote
Old 06-08-2005, 10:55 PM   #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

When was your last tune up...
BillBoost37 is offline   Reply With Quote
Old 06-09-2005, 01:42 AM   #4
Senior Member
Posts like a Camaro
 
Join Date: Apr 2005
Location: Grand Rapids,MI
Posts: 981
Thanks: 0
Thanked 0 Times in 0 Posts
Masterbm is on a distinguished road
Default

isn't that oil pressure low even when my car had bad pan seal and intake seal it ran about 38 hot
Masterbm is offline   Reply With Quote
Old 06-09-2005, 02:09 AM   #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

Check your harmonic balancer/dampener for cracking of the rubber material behind the pulley.
willwren is offline   Reply With Quote
Old 06-09-2005, 03:18 AM   #6
Senior Member
True Car Nut
 
GAMEOVER's Avatar
 
Join Date: Aug 2003
Location: Racine Wi
Posts: 5,146
Thanks: 0
Thanked 0 Times in 0 Posts
GAMEOVER is on a distinguished road
Default

maybe TC bolts
GAMEOVER is offline   Reply With Quote
Old 06-09-2005, 08:10 AM   #7
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

Quote:
Originally Posted by GAMEOVER
maybe TC bolts
Hahaha Experience speaks loudly to some of us... your oil pressure isn't something worry about yet. If you are using 0-30W consider moving up to 5-30W or 10-40W. But don't worry about it.
BillBoost37 is offline   Reply With Quote
Old 06-09-2005, 09:31 AM   #8
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Feb 2005
Location: arkansas
Posts: 38
Thanks: 0
Thanked 0 Times in 0 Posts
psycho_72653 is on a distinguished road
Default

Hey Guys, thanks for the tips....I can't remember the last tune up so it seems its probably due for one, I can rule out the balancer because I just had that off to replace crank sensor and it looked ok....I will check the tc bolts tonight.

I've also had someone tell me that the rear bearing for the balance shaft may be causing that...have not found any info on that or any complaints from others.

I'm using 10-30 castrol oil, wondering if oil sendeing unit may be off some, the gauge has a tendency to twitch sometimes, will probably need to hook up mechanical gauge to verify pressure.

Thanks again, will keep you updated
Helge
psycho_72653 is offline   Reply With Quote
Old 06-09-2005, 11:27 AM   #9
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

Quote:
Originally Posted by psycho_72653
Hey Guys, thanks for the tips....I can't remember the last tune up so it seems its probably due for one, I can rule out the balancer because I just had that off to replace crank sensor and it looked ok....I will check the tc bolts tonight.

I've also had someone tell me that the rear bearing for the balance shaft may be causing that...have not found any info on that or any complaints from others.

I'm using 10-30 castrol oil, wondering if oil sendeing unit may be off some, the gauge has a tendency to twitch sometimes, will probably need to hook up mechanical gauge to verify pressure.

Thanks again, will keep you updated
Helge
Keep an eye on the balancer, especially below where you park. It'll show tiny bits of rubber and black dust when it starts to go. Forget TC bolts, they don't simply come loose on a car that hasn't had recent trans work. And I've never heard of a balance shaft bearing failure, and quite simply, it'* damn near impossible. That system is way overbuilt.

Check your exhaust. Sometimes a catalytic converter heat shield can fool you if it comes loose and rattles. It can be very RPM dependent, and it might also be the innards of your cat starting to come loose.
willwren is offline   Reply With Quote
Old 06-09-2005, 12:55 PM   #10
Senior Member
True Car Nut
 
GAMEOVER's Avatar
 
Join Date: Aug 2003
Location: Racine Wi
Posts: 5,146
Thanks: 0
Thanked 0 Times in 0 Posts
GAMEOVER is on a distinguished road
Default

Quote:
Originally Posted by willwren
Quote:
Originally Posted by psycho_72653
Hey Guys, thanks for the tips....I can't remember the last tune up so it seems its probably due for one, I can rule out the balancer because I just had that off to replace crank sensor and it looked ok....I will check the tc bolts tonight.

I've also had someone tell me that the rear bearing for the balance shaft may be causing that...have not found any info on that or any complaints from others.

I'm using 10-30 castrol oil, wondering if oil sendeing unit may be off some, the gauge has a tendency to twitch sometimes, will probably need to hook up mechanical gauge to verify pressure.

Thanks again, will keep you updated
Helge
Keep an eye on the balancer, especially below where you park. It'll show tiny bits of rubber and black dust when it starts to go. Forget TC bolts, they don't simply come loose on a car that hasn't had recent trans work. And I've never heard of a balance shaft bearing failure, and quite simply, it'* damn near impossible. That system is way overbuilt.

Check your exhaust. Sometimes a catalytic converter heat shield can fool you if it comes loose and rattles. It can be very RPM dependent, and it might also be the innards of your cat starting to come loose.
will your right about the TC bolts but anything is possible
GAMEOVER is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
rattle buzz rattle smellbird General GM Chat 1 10-28-2007 11:54 PM
93 SSE rattle on the passenger side of engine raynemomma 1992-1999 22 08-05-2007 04:05 PM
Catalytic rattle rattle rrounds 2000-2005 4 01-27-2007 01:57 AM
Rattle Rattle Trusty Bonneville 1992-1999 7 05-18-2004 01:55 PM
Rattle, Rattle, Thunder Clap - Boom Boom Boom ---HELP--- CorradoSLC 1992-1999 12 08-28-2003 01:16 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 01:11 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.