Ls2 misfire trouble Help!! please
03-31-2013, 03:33 PM
#1
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Ls2 misfire trouble Help!! please Hello everyone,
I have a 2006 Gto with 57,000 miles and I've been fighting a misfire problem for a while now.This is the story...from what I remember it didn't misfire before my tune or at least I didn't noticed it. Car seemed to run fine...then i had a bad sputtering and a rough idle like it was cammed about a month or so later with a CEL that I scanned ..it was a bad o2 on bank 1 sensor 1 ...which i swapped with bank2 sensor 1 and it followed it there so i replaced bank 1 sensor 1 with new o2 sensor. So after that i still have a rough idle and when under load i get little jerks im guessing misfires here and there with a flashing CEL.I dont get a smooth acceleration. The mods are otrcai , jba headers and cat less midpipes msd spark plug wires and NGK tr55 spark plugs. I've pulled the spark plugs often to check and they look like they are fine. I also had a leaking vavle cover gasket but on opposite side but I replaced both.
Things I've done to trouble shoot are I've switched plugs around, coil packs around, swapped injectors ,spark plug wires and a compression check. The misfires always stay on cylinder #4 never moves so I'm thinking all the parts are fine
Compression #'s are
Cyl # 1 (190)
Cyl #2 (195)
Cyl #3 (189)
Cyl #4 (186)
Cyl #5 (189)
Cyl #6 (191)
Cyl #7 (190)
Cyl #8 (190)
Whats steps should I do next?
Do you thinks its the tune?
Ive also tried spraying around starter fluid for vaccum leaks didnt see any real noticeable changes in engine running.
Should i just pull the intake manifold for fun to check it out?
Thanks for the help in advance and sorry i did this from my phone.
I have a 2006 Gto with 57,000 miles and I've been fighting a misfire problem for a while now.This is the story...from what I remember it didn't misfire before my tune or at least I didn't noticed it. Car seemed to run fine...then i had a bad sputtering and a rough idle like it was cammed about a month or so later with a CEL that I scanned ..it was a bad o2 on bank 1 sensor 1 ...which i swapped with bank2 sensor 1 and it followed it there so i replaced bank 1 sensor 1 with new o2 sensor. So after that i still have a rough idle and when under load i get little jerks im guessing misfires here and there with a flashing CEL.I dont get a smooth acceleration. The mods are otrcai , jba headers and cat less midpipes msd spark plug wires and NGK tr55 spark plugs. I've pulled the spark plugs often to check and they look like they are fine. I also had a leaking vavle cover gasket but on opposite side but I replaced both.
Things I've done to trouble shoot are I've switched plugs around, coil packs around, swapped injectors ,spark plug wires and a compression check. The misfires always stay on cylinder #4 never moves so I'm thinking all the parts are fine
Compression #'s are
Cyl # 1 (190)
Cyl #2 (195)
Cyl #3 (189)
Cyl #4 (186)
Cyl #5 (189)
Cyl #6 (191)
Cyl #7 (190)
Cyl #8 (190)
Whats steps should I do next?
Do you thinks its the tune?
Ive also tried spraying around starter fluid for vaccum leaks didnt see any real noticeable changes in engine running.
Should i just pull the intake manifold for fun to check it out?
Thanks for the help in advance and sorry i did this from my phone.
04-02-2013, 07:58 AM
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Alright guys... I pulled the intake manifold and everything looked good. I put everything back together and she is running great..might of been a leak...I'm just glad its finally working like it should. Idles greats runs great and no misfires. Anyways thank y'all for the advice.
04-03-2013, 02:23 PM
#5
IF it comes back, and lets hope it doesn't. I would check O2s all the way around. I had the same problem, and had my 2 rears tuned out and had to change the 2 fronts to make it go away...
