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  #1  
Old 10-24-2011, 03:34 PM
Maddevill Maddevill is offline
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Question Code info

Hi, my sometime misfiring truck is showing a code P0300. What is it?
Thanks
Mad
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Old 10-24-2011, 03:44 PM
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http://www.obd-codes.com/p0300
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Old 10-24-2011, 04:24 PM
RedneckMechanic RedneckMechanic is offline
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P0300, as I'm sure the link says, is a random misfire code. There are a MULTITUDE of things that could cause it...
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Old 10-25-2011, 03:03 PM
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Thanks for the code web site. I guess I'll try changing a few of the easier stuff......
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Old 10-25-2011, 03:10 PM
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The first place I'd start is to inspect the plug in that cylinder and test the plug wire.
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Old 10-26-2011, 12:54 PM
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Problem is it's a "random" misfire so i don't know which cylinders are involved. I suspect it isn't even a cylinder problem since the misfire jumps around.
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Old 11-03-2011, 07:25 AM
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In my Experience I had that same problem and it never went away until I replace all the Spark plugs with Autolite 5224 and Replace all 8 of my Coils. I never had problems again with any misfire. I recommend to do the same you will be happy plug. Also you gain gas mileage and horsepower that has been lost in the misfire issue.
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Old 11-03-2011, 02:53 PM
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Talking hmmm

It seems strange to me that a random misfire would be cured by just changing plugs and coils. I would think it is caused more by something in the sensing part of the ignition or the ECU itself. But, I bought plugs and so I'll put them in. The truck has been running ok and the check light has gone out so I guess I wait until it gets sick again.
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Old 11-03-2011, 04:57 PM
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Random misfires can be cause by loose connectors on cam, crank, or TPS sensors- or these sensors could be bad.

Before you change the plugs, pull the battery lead to clear the ECM of any codes (leave it off for 30 minutes). If the problem returns, the code thrown may give you better direction to troubleshoot....
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