impulseblue06

i have been having many issues with code p0300 my misfire history on cylinder 1 is 1054 in a matter of days, 3 is 967 and 5 is 697 and 7 is 1106 does anybody have any idea what may be causing this? i have cleaned my air filter, my maf checked wires changed plugs and wires car has 24,000 miles on it 2006 gto, cylinder 2 had 10 misfires 4 had 12 and 6 35 and 8 had 5...

help me out!

Thanks

john shea

I get a p0300 every winter in the cold and ice. A mechanic told me that
in winter these cars get vacuum leaks around the hoses probably around
that big egr o ring in my case. When the weather clears a day later the ses light goes out. I know there are a lot of other causes for the code but a vacuum leak
is usually the main culprit.

impulseblue06

i cleared the code today and what do you know it came back after a cold start and about a 1/4 mile of driving the check engine light was ignited, the dealer a week ago thought maybe i had got bad gas which obviously it wasnt that.....

jimmyblue

iTrader: (11)

The bankwise consistency suggests to me that it's an O2 sensor
problem, mistrimming leading to misfueling. Cold ambient temps
and long tubes are going to aggravate O2 performance.

impulseblue06

dealer diagnosed o2 replacing under warranty :-)

impulseblue06

issue not resolved ok well i switched my o2 extensions between the 2 sides of the car and well lets jus say the issue did not follow as i expected so its not my extension, i had the check engine light come on a few days and today it dissapeared out of nowhere but when i scan it with the scanner it still says i have po300? im getting pretty bad mileage too at this point i got stuck on some ice today and well lets just say after that a few starts later the light went out....and it seems like its running alittle better? but when i scanned it when i got home still po300 but no showing the ses light? i only have one code po300 and i have gone through hell with this code so far, had fuel system cleaned, changed plugs, wires, plugs, new o2......im also getting terrible mileage my issue is on the driver bank however when looking at hp tuners i can see the voltage of the front o2 on driver side not following the other sensors like it should and also tons of misfires on the driver bank in the history...

zrater

Listen to what jimmy told u...

edcmat-l1

iTrader: (10)

You have HPTuners? Can you post a runlog and tune?

Does it feel like it's missing? If it's really misfiring that bad, it ought to be running like a bag of ***.