P0300 Random Misfire issue - Pontiac GTO Forum
Pontiac GTO Pontiac GTO Forum

» Auto Insurance
Wheel & Tire Center

Go Back   Pontiac GTO Forum > The 2004-2006 GTO > Service, Maintenance and Technical Discussion
Register Home Forum Active Topics Photo Gallery Garage Search Today's Posts Mark Forums Read Auto EscrowInsurance

GtoForum.com is the premier Pontiac GTO Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 12-26-2012, 11:16 PM   #1 (permalink)
 
Join Date: May 2011
Posts: 23
My Photos: (0)
P0300 Random Misfire issue

Hello everyone,

I have a LS1 GTO cat delete that is having some serious misfire issues. The check engine light flashes at 2000 to 4000 rpm, the light stays on at idle (rough idle) and no misfires over 4000 revolution. I check the wiring and nothing seems to be out of order and tried to detect which cylinder is misfiring but it's every one of the cylinder misfiring at random!

background: 04 LS1 GTO 62k miles. The car has headers, straight pipes, cat delete with diablosport O2off Tune. 3" Full exhaust with 2 32" resonators and mufflers.

I have recently started putting premium Costco gas in the car. My friend who gets gas from the same spot is having fuel related issues. He drives an integra GSR . Not sure if this is a coincidence or it is bad costco gas causing this.

I stopped by Autozone and put a whole thing of fuel injector cleaner and octane boost with hydration eliminator in the car and drove it home for 10 miles. It didn't drive any better!

The car sounds and drives like a tractor and I dont wanna damage anything so you help is definitely appreciated.
Alireza is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 12-31-2012, 10:43 PM   #2 (permalink)
 
B-ville Goat's Avatar
 
Join Date: Oct 2008
Posts: 319
My Photos: (0)
Pull the plugs and check them. Also try filling at a different station to see if that helps?
__________________
Vice President
Susquehanna Valley GTOs
B-ville Goat is offline   Reply With Quote
Old 01-01-2013, 09:44 AM   #3 (permalink)
 
HP11's Avatar
 
Join Date: Apr 2009
Location: San Bernardino, Ca.
Posts: 2,303
My Photos: (20)
A good reason not to use fuel additives. You'll probably need to burn those additives out of your fuel system and then run a tank or two of gas from the 'different station' before you could rule out the gas itself being the problem.
__________________
2005 Pontaic GTO - CGM 6 Speed (My car)
2004 Ford Ranger Edge Supercab (My daily driver)
2010 Mercedes Benz C300 Sedan (Wife's car)
2014 Kia Rio LX (Wife's daily driver)
HP11 is online now   Reply With Quote
Old 01-03-2013, 09:15 AM   #4 (permalink)
 
Join Date: Aug 2011
Location: Spring Hill, TN
Posts: 91
My Photos: (1)
Make sure there is no clog in airflow either, recently seen issues of MAF or just clogs causing not enough air and misfirings happen bad at idle but as the vehicle was higher rev was fine.
Jeffcarr is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 2004-2006 GTO > Service, Maintenance and Technical Discussion


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
P0300 code taz4141 2004-2006 GTO General Discussion 6 05-11-2012 11:12 PM
Misfire at idle really bugging me Gtojustin Service, Maintenance and Technical Discussion 4 04-04-2012 09:51 PM
random misfire trouble code ? help Bossin Service, Maintenance and Technical Discussion 10 09-25-2011 06:53 PM
06 gto misfire s10ss Service, Maintenance and Technical Discussion 9 01-04-2011 09:48 PM
Gto Misfire KennedyKustoms Engine Discussions 6 04-21-2010 01:11 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 02:45 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.3.2
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.