GrandAmGT.com Forum
http://www.pfyc.com GrandAmGT.com Premium Memership Signup
RotorsOnline.com   

Go Back   GrandAmGT.com Forum > GAGT - Technical - Sponsored by www.MilzyMotorSports.com > Technical Q&A

Reply
 
Thread Tools Display Modes
Old 04-14-2017, 05:15 PM   #1
dylanbour
GAGT - Newbie
 
AKA: dylan
Join Date: Nov 2015
Location: il
Posts: 15
Vehicle: 2001 grand am gt coupe
dylanbour Gettin' there
GA misfire issue

i have a 2001 grand am gt v6 3400Ok so my car first started off misfiring when I would first start it get the blinking check engine soon light
Then I smoke tested and found a leak in my cyl 4 injector oring so I pulled the intake and put new injector oring and caps and intake plenum gasket thinking this was the cause of the misfire
I have also have done a exhuast muffler dealett ,Got it back together and the misfire is worse now more frequent I have have replaced plugs, wires within the last year , I smoke tested it again and no leaks , me and my dad switched out coil packs and igniton control modal and that didn't change anything. Any other ideas what it could be thanks
dylanbour is offline   Reply With Quote
Old 04-14-2017, 05:35 PM   #2
Madness10
GAGT - Member
 
AKA: Matthew
Join Date: Nov 2014
Location: Fontana,Calif
Age: 50
Posts: 94
Vehicle: 2003 Grand Am SE1
Madness10 Gettin' there
Quote:
Originally Posted by dylanbour View Post
i have a 2001 grand am gt v6 3400Ok so my car first started off misfiring when I would first start it get the blinking check engine soon light
Then I smoke tested and found a leak in my cyl 4 injector oring so I pulled the intake and put new injector oring and caps and intake plenum gasket thinking this was the cause of the misfire
I have also have done a exhuast muffler dealett ,Got it back together and the misfire is worse now more frequent I have have replaced plugs, wires within the last year , I smoke tested it again and no leaks , me and my dad switched out coil packs and igniton control modal and that didn't change anything. Any other ideas what it could be thanks
A few things. Did the misfire changed cylinders when you swapped coils? Have you done a block test to rule out blown head gasket? Have you checked for a burnt valve? Taking the muffler off does nothing for performance or sound and will enhance any problems you may have.
Madness10 is offline   Reply With Quote
Old 04-14-2017, 08:31 PM   #3
dylanbour
GAGT - Newbie
 
AKA: dylan
Join Date: Nov 2015
Location: il
Posts: 15
Vehicle: 2001 grand am gt coupe
dylanbour Gettin' there
Unsure on which cylinders or valves , I compression tested and that came back all good I cut the muffler for the sound diffrenrce and there was a major defence but eventually got annoying so I'm putting it back on tomorrow
dylanbour is offline   Reply With Quote
Old 04-14-2017, 10:42 PM   #4
Madness10
GAGT - Member
 
AKA: Matthew
Join Date: Nov 2014
Location: Fontana,Calif
Age: 50
Posts: 94
Vehicle: 2003 Grand Am SE1
Madness10 Gettin' there
Quote:
Originally Posted by dylanbour View Post
Unsure on which cylinders or valves , I compression tested and that came back all good I cut the muffler for the sound diffrenrce and there was a major defence but eventually got annoying so I'm putting it back on tomorrow
Did you have the codes read as to which cylinder was backfiring? The code will be a backfire code(p3000) followed by the cylinder. Example p3001 will be cylinder 1 and so on. This step is very crucial to determining where the backfire is coming from and where to start. You can't fix the problem unless you know where to start.
Madness10 is offline   Reply With Quote
Reply

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
Forum Jump


All times are GMT -6. The time now is 02:43 AM.


Powered by vBulletin® Version 3.7.2
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 2011 GrandAmGT.com
RotorsOnline.com