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Old 09-21-2009, 11:23 PM   #11
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Cylinder misfire can be caused by the following

  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(*)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(*)
  • Running out of fuel
  • Poor compression
  • Defective computer
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Old 09-21-2009, 11:33 PM   #12
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well next thing to check would be the injector, hopefully it wouldnt be the exhaust valve or a compression issue, beacuse I've checked the plug, wire, and coil pack

if all else fails I would try the computer after the injector with one I know was good on my car just reprogrammed for the SC
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Old 09-21-2009, 11:37 PM   #13
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If you have a compression tester, I would check that.
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Old 09-21-2009, 11:38 PM   #14
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I don't personally but I'm sure I can find someone with one
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Old 09-22-2009, 07:51 PM   #15
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Didn't get around to checking the compression today, but I think its ok because once the car gets above 3000 RPM everything stabilzes and the SES light stops flashing so I think a little piece of something got into the injctor, I will get another from Morad tommorow and swap it
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Old 09-22-2009, 09:41 PM   #16
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I had a GTP here the other week with a rough idle and a misfire. We scratched our heads for about a week. Turned out to be a broken valve spring. I like to find out what is not the problem, then what'* left is the problem. You know it'* not the ignition system. So that leaves the fuel and mechanical. Swap injectors and if the problem is still in the same place, then it'* not fuel, that leaves mechanical. Valve spring, burnt valve, bent pushrod, damaged rocker, or bad lifter.
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Old 09-22-2009, 09:51 PM   #17
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Yah, if its in the valvetrain I'll leave that to the experts
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Old 09-26-2009, 07:26 PM   #18
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got the injector from Morad yesterday, that was my problem

no more misfire on cylinder 1
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