Misfiring - 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 07-18-2009, 04:03 PM   #1
Senior Member
Posts like a Corvette
Thread Starter
 
Nighthwk12's Avatar
 
Join Date: Feb 2009
Location: Jersey Shore
Posts: 1,511
Thanks: 0
Thanked 0 Times in 0 Posts
Nighthwk12 is on a distinguished road
Default Misfiring

So under hard acceleration mostly second gear up in the high rpms my car misfires. use to be random multiples, now it'* just cylinder 1. (not 5 which is odd bill knows why).
Things I've done:
Plugs
Wires
Test Coils
Clean coils and terminals
Fuel Pump
New vacuum lines
Wire no where close to the O2
New O2 sensor

So I'm at the end of the line and really need a new idea. Thanks guys
Nighthwk12 is offline   Reply With Quote
Old 07-18-2009, 06:41 PM   #2
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

Fuel filter and test fuel pressure. Try moving a injector and see if the problem follows that injector.
Danthurs is offline   Reply With Quote
Old 07-18-2009, 06:53 PM   #3
Senior Member
Posts like a Corvette
Thread Starter
 
Nighthwk12's Avatar
 
Join Date: Feb 2009
Location: Jersey Shore
Posts: 1,511
Thanks: 0
Thanked 0 Times in 0 Posts
Nighthwk12 is on a distinguished road
Default

filter was done too. need to test the pressure again. I'll start playing with the injectors
Nighthwk12 is offline   Reply With Quote
Old 07-18-2009, 06:59 PM   #4
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

You can also try moving the plugs, see if the problem follows. Only make one change at a time.

A single misfire should be something unique to that cylinder. Plug, wire, injector. A bad coil generally will be both cylinders. But can cause a problem in just one. Fuel pump, and filter tend to cause random misfires if at all.
Danthurs is offline   Reply With Quote
Old 07-18-2009, 07:23 PM   #5
Senior Member
Posts like a Corvette
Thread Starter
 
Nighthwk12's Avatar
 
Join Date: Feb 2009
Location: Jersey Shore
Posts: 1,511
Thanks: 0
Thanked 0 Times in 0 Posts
Nighthwk12 is on a distinguished road
Default

yeah just going to have to do this scientifically one variable at a time. I think it may be an injector the car does have 145K on it
Nighthwk12 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Misfiring Cylinder Problem: Fixed Sully1742 1992-1999 14 05-19-2006 09:11 AM
Misfiring SSEi 1992 Mike 72 1992-1999 15 09-01-2005 06:01 AM
Engine misfiring iwin12 1992-1999 8 07-03-2005 03:35 PM
Falling back into OL-1/Misfiring/Rough Idle No CODES Daron97SSE 1992-1999 7 04-13-2005 07:59 PM
totally misfiring? FatherStorm 1992-1999 6 02-19-2004 07:08 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 12:35 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.