Chev Cobalt SS 2006
so here is the problem, while driving on the interstate the car started having a serious misfire. we pulled in a autozone in order to get the codes pulled from the computer since the SES light was blinking.
The codes were a p0303 thats indicated a misfire in cylinder no 3.
We looked on the web and found a TSB that indicated that these models can have a harness rub and short to ground, however we preformed the procedure and no lines were damaged and shorted to ground.
We pulled the plugs and found our first clue at the problem.
As you can see the plug in no 3 cylinder was completely shot.
We replaced the plugs with champion 9001 iridiums. The plugs were shorter that the gm plugs witch is weird, but the clerch at the store assured us it was the correct plug for the model.
after replaceing the pugs and the no 3 coilpack the problem still persist. in fact we checked the sparks and all 4 coil provide spark to the plugs.
When we looked with a flashlight we could see that there was raw fuel in the cylinder no 3.
So what could be causeing a no combustion situation at this point?