Misfire p0300
Thread Starter
Teching In
Joined: Jan 2008
Posts: 13
Likes: 0
From: Ohio
Misfire p0300 I have a 99 pontiac trans am it just started acting funny.I got a check engine light on and the car has a misfire on lower rpms but if you stomp the gas down it runs fine.It seems to be getting worse as the car warms up.I have just headers,no cats and a borla muffler also their are no rear 02's. The check engine light is saying p0300.I had the car put on a snap on scanner and its saying misfire on cylinders 1.3.5.7 all bank 1. I have had a compression test done and its showed up fine,a wet test also the valve springs looked at.Their are so many posts on here and I dont want to start just replacing plugs,wires,injectors,coils that can get a bit expensive.Please if anyone has any ideas let me know.. Thanks..
Launching!
Joined: Dec 2007
Posts: 255
Likes: 4
From: greenbrier tn
I have the same problem. I installed a LS7 in my 1932 pro street truck. And I am running a 400 turbo tranny. Can I just go into the PCM and get rid of the PO300 code so it want come on anymore? Plus is there a difference between the o2 on the driver side & the passenger side? I have headers. So the rear o2's have been eliminated. Mine is a random misfire. The truck runs great, it just gives the code.
