Check engine light - 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 01-22-2007, 12:48 AM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jan 2007
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
jv2351 is on a distinguished road
Default Check engine light

Random misfires are causing check engine light (according to dealer mechanic). Usually light goes out some time later. Using fuel injector cleaner seems to make the problem less frequent. Replaced the plus and wires. What could be causing this problem? What should I do?
jv2351 is offline   Reply With Quote
Old 01-22-2007, 12:51 AM   #2
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

What year? What engine? Has it been scanned while driving looking for odd KR?

Maybe the ICM? I'm guessing.
J Wikoff is offline   Reply With Quote
Old 01-22-2007, 12:57 AM   #3
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jan 2007
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
jv2351 is on a distinguished road
Default

96 SSEi, 3.8 super charged...

What is KR?
jv2351 is offline   Reply With Quote
Old 01-22-2007, 01:04 AM   #4
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

Knock retard. When the air fuel mixture starts burning too early before the spark plug discharges, the cylinder will reach max pressure before top dead center. The knock sensors sense knock, and the PCM will do what it can to stop it from happening again short term (and long term be retarding timing in general.

What was the code that set the light?
J Wikoff is offline   Reply With Quote
Old 01-22-2007, 01:16 AM   #5
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Jan 2007
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
jv2351 is on a distinguished road
Default

Thus a timing problem? I have noticed performance is poor. I thought it was age.

I would have to ask the garage for the codes. My understanding is that there were a number of different codes occuring seemingly randomly.

I can ask for codes info. Would this help?
jv2351 is offline   Reply With Quote
Old 01-22-2007, 02:09 AM   #6
Senior Member
True Car Nut
 
Join Date: Aug 2005
Posts: 5,797
Thanks: 0
Thanked 0 Times in 0 Posts
Peterg22000 is on a distinguished road
Default

No your problem is NOT timing


and getting the code number would help.

also if its a misfire a good place to start would be to replace the plugs and wires
(doing them fixed my car up in a hurry)
Peterg22000 is offline   Reply With Quote
Old 01-22-2007, 02:13 AM   #7
Senior Member
True Car Nut
 
Join Date: Jul 2004
Location: Grand Rapids, Mi
Posts: 5,656
Thanks: 0
Thanked 0 Times in 0 Posts
Archon is on a distinguished road
Default

Yes, the actual codes would help as there are several things that could cause your problem. When does the light start flashing? Normal cruise, wide open throttle, slight acceleration? Fuel pressure, coils, ignition control module, vacuum leaks, and corroded battery cables are some possibilities.

What brand plugs did you use?
Archon is offline   Reply With Quote
Old 01-22-2007, 04:17 AM   #8
Senior Member
True Car Nut
 
Join Date: Jun 2003
Location: Climax Springs, Missouri
Posts: 2,493
Thanks: 0
Thanked 0 Times in 0 Posts
LittleHoov is on a distinguished road
Default

Quote:
Originally Posted by jv2351
96 SSEi, 3.8 super charged...

What is KR?
What grade of fuel do you normally run? Should be using 91 or higher.
LittleHoov is offline   Reply With Quote
Old 01-22-2007, 08:14 AM   #9
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

Random or multiple misfires can be caused by
Fuel grade
Pulley size
Spark plug heat range
Loose ground connections
ICM

If you start by looking at your fuel and ensure you are only using premium (highest octane in your area) that'* step 1. Step 2 is ... have you changed anything lately?
Spark plugs fall into the anything lately category. Platinum and or Bosch plugs are known to have issues in our waste spark system that is in our cars. Loose or poor grounds are also a factor that is easily located and remedied. Due to the cost..the last item to usually question is the ICM.
BillBoost37 is offline   Reply With Quote
Old 01-22-2007, 10:10 AM   #10
Senior Member
True Car Nut
 
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road
Default

Double check the plug wires to make sure they are routed correctly and not touching the oxygen sensor wiring.
bill buttermore is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1998 Catera - Check Engine Light, ABS Light and TC light on lucille2 Cadillac 2 02-10-2011 11:58 AM
Phantom Check Engine Light/Rough Engine/Coolant Temp. Gauge Whacky RWW2003 1992-1999 10 11-13-2009 08:00 AM
Check Gages-BRAKE light, trac off light, and Antilock light all on MissRockstar04 2000-2005 9 07-07-2009 05:12 PM
Engine miss, check engine light on - NO code mdrose64 1992-1999 12 07-16-2007 12:43 PM
Check engine light and traction off light on - hissing sound erics95se 1992-1999 11 04-08-2006 01:40 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 01:44 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.