Replaced plugs....still misfiring
12-09-2010, 10:28 PM
#26
Fuel pressure good. A good tune and verify its the correct tune for the car. fm changed misfire revolutions also to take csre of this code. If Any of u have hptuners u can see this by going from a 06 to a 07 misfire revloution map and see a lot was changed. But a,maf leaky intake, vacuum leak bad,fuel pressure, bad harness. Ad ground could cause the p0300
12-10-2010, 10:22 AM
#28
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Got a whole new longblock and its still stage 2...Gm technicians finally found the problem. RPM's tune was bad, they apparently tuned the crankcase wrong and wore away the piston rings and it ruined the whole engine
01-11-2011, 03:12 PM
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01-11-2011, 03:15 PM
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dunno if it has been said but normal procedure for this car to help misfires is new plugs gapped correctly to ur pulley, fuel filter relpaced and a good tb cleaning. depending on mileage prolly fuel filter.
01-11-2011, 04:58 PM
#34
I had a car that was doing the same thing. For some reason the tune had no fuel trims and was causing missfire and a really rough running car. Cyl 2 & 3 would just cycle to 100 over and over. He changed out plugs and gapped them according and his car started with the issue. ECU was sent back and once the new one came car ran normal.
Not saying its the case but if someone local with hptuners is around have them hook it up and monitor your missfires.
Not saying its the case but if someone local with hptuners is around have them hook it up and monitor your missfires.
01-11-2011, 05:24 PM
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car is stock. The check engine light is gone.. But some times on a cold start up I get a loud knocing till it warms up, I haven't heard it in a few days so I don't knw. Also when I give it gas I get a harrd jerk and when I let off the gas. I might just take it in anyways. I didn't wanna because all they would tell me is we can't verify.. The noise which I've seen at work and people get mad.
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