Cylinder 5 misfire trouble code P0305

[J GTP]

Could be a cracked head gasket. Start it up and check for a hissing noise by cylinder 5. It could also be a plugged injector so you could try replacing that. It MIGHT help to run some of that bottled injector cleaner crap through a tank of gas. I've never used the stuff, I always figured it was a gimmick. It could potentially be a cheap fix, but I'd wait and see what others think.

[michellebuck76]

Thanks for your feedback J. I tried that fuel injector stuff already and I as well believe that is a gimic or just a bandaid solution to a bigger problem to come. No hissing noise but i am going to try replacing the injectors is the cost is not too high. Thanks again for your help. Michelle

[GoBlueDawson]

Purchase the set of 6 from ZZPerformance, heres's a link GM ACDelco - 33# GM EV1 Injectors #GM-0280155737-6 if you want to save the money, they are remaned/rebuilt and tested. If you want to just get 1 new injector they can run between $80-$100 to purchase.

[L36 Killer]

Thanks for your feedback J. I tried that fuel injector stuff already and I as well believe that is a gimic or just a bandaid solution to a bigger problem to come. No hissing noise but i am going to try replacing the injectors is the cost is not too high. Thanks again for your help. Michelle

Before you buy new injectors, switch the one off of cylinder 5 with cylinder 3. If the misfire changes to cylinder 3, you know it's the injector. If not, move on to the next possibility. From personal experience, I know it can get real expensive chasing down a misfire.