ignition misfire...codes? - 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 05-22-2006, 06:51 PM   #1
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Aug 2004
Location: Long Island, NY
Posts: 285
Thanks: 0
Thanked 0 Times in 0 Posts
c0rsa180 is on a distinguished road
Default ignition misfire...codes?

Umm...ive been thinking...i have a scanner that i would be able to hook my car up to since ive been havning the shuddering problem which is supposedley a symptom of an ignition misfire...but wouldnt this ignition misfire throw a code, or what am i looking for here...im going to pull the coils but i wanted to hook it to the scanner first
c0rsa180 is offline   Reply With Quote
Old 05-22-2006, 06:57 PM   #2
Senior Member
Posts like a Supercharger
 
Join Date: Feb 2004
Location: San Jacinto, CA
Posts: 155
Thanks: 0
Thanked 0 Times in 0 Posts
TheEngineer is on a distinguished road
Default

Depends on your scanner, but many have a parameter (OBDII systems) that will allow you to scan for misfires and reports the cylinder that the misfire is occurring on. If it is just an occassional miss, it will not set a code and turn on your Check Engine light. It has to be a somewhat consistent problem before it will set a code.

I'm not sure what you mean by "shudder" though. Most shudders originate in the transmission. Misses and hesitation are usually more indicative of an engine problem.
TheEngineer is offline   Reply With Quote
Old 05-22-2006, 07:29 PM   #3
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Aug 2004
Location: Long Island, NY
Posts: 285
Thanks: 0
Thanked 0 Times in 0 Posts
c0rsa180 is on a distinguished road
Default

well i had posted a problem that i orginally thought to b a tranny problem but wilwren said that they were common signs of an engine misfire, and to check the coils...so im gonna go that route before i start to worry about a tranny problem
c0rsa180 is offline   Reply With Quote
Old 05-23-2006, 12:03 AM   #4
Senior Member
Posts like a Camaro
 
Join Date: Apr 2005
Posts: 1,071
Thanks: 0
Thanked 0 Times in 0 Posts
Sully1742 is on a distinguished road
Default

Quote:
Originally Posted by c0rsa180
well i had posted a problem that i orginally thought to b a tranny problem but wilwren said that they were common signs of an engine misfire, and to check the coils...so im gonna go that route before i start to worry about a tranny problem
Check the codes, I had a similar problem last week. I got mine scnaned at autozone, found it was a misfire. All it needed was one plug wire changed. (I did all of them + new plugs anyways, but fix the problem first.)

There is also a procedure in techinfo on checking your coils.
Sully1742 is offline   Reply With Quote
Old 05-23-2006, 12:13 AM   #5
Senior Member
True Car Nut
 
Join Date: Jun 2004
Location: Rochester, NY (college)
Posts: 6,182
Thanks: 0
Thanked 0 Times in 0 Posts
corvettecrazy is on a distinguished road
Default

If you scanner can do live stuff, run with it live. To throw a misfire code the misfire must occur a certain number of times in a certain number of revolutions or something like that.

Look for a P030x code x=0-6
corvettecrazy is offline   Reply With Quote
Old 05-23-2006, 07:19 AM   #6
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

Your PCM will only log misfires as a fault after a certain number in a certain amount of time on each cylinder, or a certain number of randoms in a certain amount of time.
willwren is offline   Reply With Quote
Old 05-23-2006, 08:59 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

Let'* cover the basics.

Plugs, how long ago and what brand?
Wires, how long ago and what brand?
Air filter, how long ago?
Fuel filter, how long ago?
Have you ever cleaned your throttle body and sensors?
Have you checked fuel pressure?
Did this shudder being all of a sudden after you worked on the car?

If I remember correctly you posted that the issue was happening with the torque converter in lockup and this would indicate a ignition related issue.
BillBoost37 is offline   Reply With Quote
Old 05-24-2006, 12:51 AM   #8
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Aug 2004
Location: Long Island, NY
Posts: 285
Thanks: 0
Thanked 0 Times in 0 Posts
c0rsa180 is on a distinguished road
Default

plugs and wires replaced less than 10000 miles ago, not sure how long and everything is AC Delco...maybe 2 yrs or less...air filter less than a year...fuel filter less than a year...tranny fluid and filter about 4 months...havent touched or cleaned the throttle body...and am going to do the coil diagnosis this weekend
c0rsa180 is offline   Reply With Quote
Old 05-25-2006, 06:16 PM   #9
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Aug 2004
Location: Long Island, NY
Posts: 285
Thanks: 0
Thanked 0 Times in 0 Posts
c0rsa180 is on a distinguished road
Default

ok heres the update...at work i checked the coils and they're within the specified range so that takes that out of the equation...this weekend im gonna pull all the plugs and check them so ill keep u guys updated...any more suggestions?
c0rsa180 is offline   Reply With Quote
Old 05-25-2006, 06:23 PM   #10
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

The coils are still a possibility if it only misses when warmed up. Other than that, sounds like you're on the right track.
willwren is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
misfire/backfire 92 bonneville se 3800 blue_bonn_evil 1992-1999 17 05-29-2011 04:55 PM
random multiple misfire codes doodle4prez 2000-2005 6 01-18-2010 03:49 PM
Ignition wire test procedure? Misfire #1 PO301 96Bonne124 1992-1999 1 06-15-2009 02:41 PM
ignition misfire (studdering) problem BonEvilSSEi General GM Chat 0 01-20-2005 08:00 PM
Engine Misfire - safe to drive? StoopidSavant 1992-1999 12 12-23-2002 02:23 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 04:48 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.