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Old Jan 2, 2010 | 06:28 PM
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Default p0300

anyone dealt with this before?
my car had a misfire. re checked my coils and wires
deleted the code. car runs fine but the code came back on .
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Old Jan 2, 2010 | 07:27 PM
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doesnt your car have a stock cam??
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Old Jan 2, 2010 | 08:23 PM
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does it come on only when it's idling?
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Old Jan 3, 2010 | 03:47 AM
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Originally Posted by Ryne @ CMS
doesnt your car have a stock cam??
yeah its a stock cam. what should i look for? coil harness?

Originally Posted by 00SSLS1
does it come on only when it's idling?
noh it stays on. car did idle funny at first but its running fine now. the code just popped up on me while driving again
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Old Jan 3, 2010 | 06:30 AM
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I'd change your plug wires and plugs...regardless of how old they are or how many miles are on them.
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Old Jan 3, 2010 | 02:02 PM
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must likey a grounded plug wire or take them off one by one and inspect
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Old Jan 3, 2010 | 02:21 PM
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not sure if my ohm reader is accurate but one plug wasnt reading anything and the other was reading about 128 the rest are about 50

my sparkplugs look perfectly fine

Last edited by TPI TERROR; Jan 3, 2010 at 02:42 PM.
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Old Jan 3, 2010 | 11:46 PM
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probably a random misfire somewhere you need to track down...... if it had a cam i would say idle misfire tables need to be altered......
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Old Jan 4, 2010 | 02:47 AM
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Originally Posted by Ryne @ CMS
probably a random misfire somewhere you need to track down...... if it had a cam i would say idle misfire tables need to be altered......
Is that what you did for my car. I used to get that random misfire code every once and a while, but since the last time you tuned my car I havn't thrown any codes at all.
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Old Jan 4, 2010 | 08:31 AM
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Spark plug wires are messed up somewhere, could also be a bad ground as stated check the wires on the back of the driver side head and see if the bolt is tight back there. pain in the *** i know. Otherwise pull spark plug wires I have extras if you want to borrow I have been through this enough times now. I have msd's and extra stock ones let me know if ya need either to test it out.
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Old Jan 4, 2010 | 03:27 PM
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Originally Posted by Fifedogg
Is that what you did for my car. I used to get that random misfire code every once and a while, but since the last time you tuned my car I havn't thrown any codes at all.
most likely yes
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Old Jan 4, 2010 | 10:07 PM
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car is stil runing strong . maybe the code hasnt dissapeared.

anyone selling individual msds. ? or
i might juist pick up a new set from ls1tech vendors
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Old Jan 7, 2010 | 05:37 PM
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Also, I know my P0300 code ended up being a little bit of water in the driver side 02 sensor harness (where it plugs into the extension). Found that out after I replaced all the coils/plugs, and was about to replace the 02 sensors, lol. Blew the water out and the code went away.


So I'd check the random, easy free stuff first. All the connections that control fuel/air/spark.
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Old Jan 7, 2010 | 05:57 PM
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Originally Posted by TPI TERROR
car is stil runing strong . maybe the code hasnt dissapeared.

anyone selling individual msds. ? or
i might juist pick up a new set from ls1tech vendors

before you throw parts at it have it checked you might end up buying something you dont need

Originally Posted by Texas 02 Z28
Also, I know my P0300 code ended up being a little bit of water in the driver side 02 sensor harness (where it plugs into the extension). Found that out after I replaced all the coils/plugs, and was about to replace the 02 sensors, lol. Blew the water out and the code went away.


So I'd check the random, easy free stuff first. All the connections that control fuel/air/spark.
perfect example. Just my 2 cents unless your confident in your skills as a mechanic.
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