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check engine; miss fire code?

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Old Jun 16, 2010, 10:59 PM
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check engine; miss fire code?
well my check engine periodically goes on and off. I pulled the code and it says mutiple misfires?

what could be the cause of this? It runs good but it is annoying seeing that light go on and off!


please help!


thanks in advance!
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Old Jun 17, 2010, 06:21 AM
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what year is the car? when does it missfire? it may be as simple as needed a rom update.
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Old Jun 17, 2010, 06:31 AM
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Search P0300 on this site and you'll will learn everything you need to know. There are threads dating back to 03 on the issue
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Old Jun 17, 2010, 09:26 AM
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Originally Posted by gsrboi80
Search P0300 on this site and you'll will learn everything you need to know. There are threads dating back to 03 on the issue
thank you!
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Old Jun 17, 2010, 09:26 AM
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Originally Posted by SeeCoryRun
what year is the car? when does it missfire? it may be as simple as needed a rom update.

it is a 04. I guess multiple cylinder miss fires!
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Old Jun 17, 2010, 09:34 AM
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If it's been tuned have your tuner go back and disable that code
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Old Jun 17, 2010, 10:14 AM
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Originally Posted by 05blue8
If it's been tuned have your tuner go back and disable that code
it was tuned maybe a month ago! He turned it off, but it came back on
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Old Jun 17, 2010, 10:15 AM
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Originally Posted by XBoost
what are your current mods?
the mods are 272 cams, arp head studs, sard bov, tomei exhaust manifold, tomei 02 housing, tomei down pipe megan cat back and a turbo timer
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Old Jun 17, 2010, 10:17 AM
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check engine
Check engine lights on and off sometimes means knocks.
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Old Jun 17, 2010, 10:18 AM
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Originally Posted by 775evo
it was tuned maybe a month ago! He turned it off, but it came back on
He must not have disabled the code through periphery bits then. Have him do that.
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Old Jun 17, 2010, 10:19 AM
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check engine
Maybe the tuner left it out as an knock count. lower the boost or increase gas octane...
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Old Jun 17, 2010, 10:19 AM
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Originally Posted by es850revo
Check engine lights on and off sometimes means knocks.
If you have the knock CEL enabled it does, but he is just throwing a misfire code.
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Old Jun 17, 2010, 02:25 PM
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Originally Posted by es850revo
Check engine lights on and off sometimes means knocks.
well the knock count before the tune was 8-9 due to a huge climate change and it never being tuned. After the initial tune it was at 2-3 knocks where he said that was normal!
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