Annoying-ass P0300
06-19-2013, 11:06 AM
#1
Launching!
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Annoying-*** P0300 2005 stock LS2, E40 ECM with stock tune minus torque management and VATS, in a custom tube-chassis off-road only rig, using HPTuners.
P0300 (random misfire) randomly pops up, turns the check engine light on. The engine is NOT misfiring according to both my trained ear and misfire counts. I've performed a bazillion CASE relearns, issue does not go away. I'm about to just disable this code, just wondering if anyone has any other advice?
The engine is rigidly mounted, is it possible that harmonic vibes are traveling through the engine as a result causing slight variation in crank speed which the computer interprets as misses?
P0300 (random misfire) randomly pops up, turns the check engine light on. The engine is NOT misfiring according to both my trained ear and misfire counts. I've performed a bazillion CASE relearns, issue does not go away. I'm about to just disable this code, just wondering if anyone has any other advice?
The engine is rigidly mounted, is it possible that harmonic vibes are traveling through the engine as a result causing slight variation in crank speed which the computer interprets as misses?
Last edited by patooyee; 06-19-2013 at 11:29 AM.
06-19-2013, 08:19 PM
#4
You didn't say what trans, etc is on the back of it but it has more to do with that than being solidly mounted. Even smaller/lighter torque converters and clutches can cause random misfire codes because it's that sensitive. I say double the misfire tables and see if it goes away. If it truly runs fine and isn't misfiring then no big deal, it's common. If it's a stock trans/converter/clutch than I'm not sure what's going on because I've done many a solid mounted motor and it hasn't had misfires.
06-19-2013, 08:33 PM
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You didn't say what trans, etc is on the back of it but it has more to do with that than being solidly mounted. Even smaller/lighter torque converters and clutches can cause random misfire codes because it's that sensitive. I say double the misfire tables and see if it goes away. If it truly runs fine and isn't misfiring then no big deal, it's common. If it's a stock trans/converter/clutch than I'm not sure what's going on because I've done many a solid mounted motor and it hasn't had misfires.
06-25-2013, 12:54 PM
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You didn't say what trans, etc is on the back of it but it has more to do with that than being solidly mounted. Even smaller/lighter torque converters and clutches can cause random misfire codes because it's that sensitive. I say double the misfire tables and see if it goes away. If it truly runs fine and isn't misfiring then no big deal, it's common. If it's a stock trans/converter/clutch than I'm not sure what's going on because I've done many a solid mounted motor and it hasn't had misfires.
