code 42 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 09-03-2006, 02:43 PM   #1
Junior Member
Thread Starter
 
Join Date: Sep 2006
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
weezin355 is on a distinguished road
Default code 42

'90 Bonne throws code 42, the ICM tests out fine, any suggestions?
weezin355 is offline   Reply With Quote
Old 09-03-2006, 02:56 PM   #2
Senior Member
Certified GM nut
 
Join Date: Oct 2005
Location: Western New York
Posts: 1,942
Thanks: 0
Thanked 0 Times in 0 Posts
Technical Ted is on a distinguished road
Default

Can you give us some more ifo? Is the engine not starting, stalling or just running crappy?
Technical Ted is offline   Reply With Quote
Old 09-03-2006, 03:08 PM   #3
Junior Member
Thread Starter
 
Join Date: Sep 2006
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
weezin355 is on a distinguished road
Default

It does run,but not as responsive. It seems to run the worst cold (in open loop), sometimes have to two foot it to keep it running. Once in closed loop, the check engine light stays on but run better.
weezin355 is offline   Reply With Quote
Old 09-03-2006, 03:24 PM   #4
Senior Member
Certified GM nut
 
Join Date: Oct 2005
Location: Western New York
Posts: 1,942
Thanks: 0
Thanked 0 Times in 0 Posts
Technical Ted is on a distinguished road
Default

When was the last time the plugs & wires were changed? If it'* been awhile I'd pull the plugs & check them out. Keep track of which cylinder each plug comes from.
Technical Ted is offline   Reply With Quote
Old 09-03-2006, 04:10 PM   #5
Junior Member
Thread Starter
 
Join Date: Sep 2006
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
weezin355 is on a distinguished road
Default

I will check them out and change them anyway
weezin355 is offline   Reply With Quote
Old 09-03-2006, 04:10 PM   #6
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

Code 42 can mean a bad ICM. Just because it passed those generic autozone tests doesn't mean the unit is good. I've heard accounts of good units failing and bad units passing.. and I also have experience with that. You really want to try swapping ICMs.

It could also be the timing chain jumped time, however I think usually you get a code 43 if that does happen [not sure].
opensourceguy is offline   Reply With Quote
Old 09-09-2006, 01:04 AM   #7
Junior Member
Thread Starter
 
Join Date: Sep 2006
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
weezin355 is on a distinguished road
Default

The Bone stalled and this time wouldn't restart. I noticed that th ICM & Coil pack were melted together, so I ended up swapping out the ICM/Coil pack, even after it check out good when Napa tested ( just as opensourceguy stated). Car starts now but still throwing code, did a quick tune up with plugs and wires not knowing when it was done last. I finally diagnosed it to the ECM, went to the local salvage yard lucky enough to find a factory reconditioned ECM out of a '90 Lesabre, installed and car runs an idles smoother than it ever has. Thanks for the input.
weezin355 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Code 18 still exists, now joined by Code 17 Kimberly Buick 55 06-13-2012 09:00 PM
Need OBD-II code help Code: B1242 pkmach1 General GM Chat 8 04-21-2011 10:52 AM
TCC (torque coinverter clutch)code and Evap code at same time?? (fixed) lobi Oldsmobile 16 02-24-2011 11:46 AM
1991 SSE - code 28 code 39 code 42 - losing sleep labonnita 1987-1991 9 12-26-2009 10:58 PM
SSEi Bonnie is having a Nervous Breakdown. Code after Code wug 2000-2005 18 08-24-2008 09:48 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 11:30 AM.


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.