Replaced UIM, 400 miles later big problems - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

Go Back   GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat > Pontiac Bonneville > 1992-1999

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.

LinkBack Thread Tools Search this Thread
Old 08-26-2005, 11:19 AM   #1
Junior Member
Posts like a Ricer Type-R
Join Date: Aug 2003
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
95greense is on a distinguished road
Default Replaced UIM, 400 miles later big problems

Last week I posted about my UIM gasket failure. My father replaced the plenum and gasket, but did not do the lowers.

For 400 miles, the car ran outstanding. Then a couple days ago I pulled out of my driveway, went about 600 feet, and hit the gas to turn out of my sub. The car had *very* little power and started knocking pretty loud. I turned around and drove it back home. Total distance driven less than a half mile.

Checked the coolant, and checked the oil, all okay. Pulled the plugs and cranked it over, just gas came out, so that'* good. Started it a couple times and the knock is definitely loud, sounds like more towards the rear of the engine but hard to be sure.

After a couple hours, I started it again, this time the knock was only about half as loud, and over the course of 1 minute or so, it completely went away. So I drove it around (about 15 miles) and it'* running perfectly again.

A friend'* cousin who is a GM tech says it sounds like the ignition control module. Says they randomly fail, then work okay for a while, then fail, etc. Plugs are new, plug wires look okay, does this sound like a reasonable thing to try? Because right now it runs awesome and how does one go about fixing that? But I have a newborn and if I can't trust the car, in traffic, etc, then I'm not comfortable driving it.

No CEL or codes that I know of, but I can't scan the car myself since it'* ODBII connector with the ODBI guts.

So let'* hear what everyone thinks!
95greense is offline   Reply With Quote
Old 08-26-2005, 11:56 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

first of all if it was a mechanical knock it wouldn't just go away so you may be safe there.
I'm thinking a valve was hanging up or you have an ignition issue.
Dirt and antifreeze could cause a valve to stick. I would change the oil again and add some rislone to make sure. Fuel injector cleaner in the tank.
If its ignition, they sell a spark tester. The next time it knocks check for spark at each plug while running with one of these pencil type testers.
SSEBONNE4EVA is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Did a LIM/UIM and 20 miles later have a Cylinder 4 Misfire famouslee99gt 2000-2005 5 01-06-2008 09:39 PM
UIM and LIM replaced now leaking coolant out of UIM gasket Paul1981 2000-2005 10 12-21-2007 10:05 PM
Looked at a 2000 SE w/19,000 miles asking $12,400.00 artk 2000-2005 13 12-19-2007 01:53 PM
Major Oil Leak - 1 quart in 400 miles! Ace 1992-1999 14 11-18-2005 12:37 AM
My car just rolled over 70,400 miles... Princess Jeanie General GM Chat 7 02-11-2004 05:10 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 On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 02:26 PM.