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P0300 code

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Old 07-08-2009, 04:47 PM
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Default P0300 code

i read its a random misfire code but whats causing it? do i need my misfire settings turned up?
Old 07-08-2009, 04:48 PM
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have u installed a cam? if not, check ur plugs and wires
Old 07-08-2009, 05:20 PM
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I would think that it's a cracked plug. Does it buck at all when you get on it?
Old 07-08-2009, 08:53 PM
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Did it happen shortly after installing the PaceSetters, or were they on there for a long time? If so, I'd almost bet on a cracked plug, loose/burnt plug wire, or something along those lines. If it happened immediately after a cam swap, then the misfire monitor needs to be softened up with tuning more than likely, but if it just popped up on its own, you probably have a real misfire. As chevytruck asked, how does it run?
Old 07-08-2009, 08:56 PM
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it runs fine and yes it did start after installing the pacesetters never noticed it before. I know we hit the back spark plug with the header trying to move it in at first but i don't think how lightly we hit it would have cracked it......but if you put in in 1st and let it creep you can feel a "miss" or what i call slight hesitation. Sometimes i can feel it when in drive and sitting a light i'll notice it, even more if i crank the AC on.
Old 07-08-2009, 09:21 PM
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Replace all your plugs,if you drop one I never use them.They can have a crack so small you can not see,and cause missfires.
I would replace the plugs personally and make sure your wires on good.
I have alot of people come to me because they are throwing a missfire code and everytime I check the wires,most of the time that is the exact problem,the a wire is not plugged in good
Old 07-08-2009, 09:41 PM
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the wire caps all "clicked" on the plugs when i checked them.......so i guess plugs it is.....
Old 07-08-2009, 09:54 PM
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Its a cheap 40-50 bucks to fix it.
Old 07-08-2009, 09:57 PM
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going to get some NGK TR55 plugs
Old 07-08-2009, 09:58 PM
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Originally Posted by Jeteys5.3
going to get some NGK TR55 plugs
Cool, less than $16 then


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