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Misfires in Cyl. 5 and 6, after changing problem continued

I have a 2002 Ford F150 4.6 I woke up turned on my car, and it was rumbling very bad and there was white smoke pouring from the exhaust. Guys at the shop ran a test and it said misfires in cyclinder 5 and 6 and unknown error code P0306. I changed the spark plugs and coil packets in cyclinder 5 and 6, but the problems are still there. Any advice?

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White smoke indicates the engine is burning antifreeze, you could have head gasket issue, if thats the case the antifreeze is getting in the cylinders and the engine is burning it. could be a stuck exhaust valve( i doubt it). find out from ford what that code indicates, that would be a better clue than tearing into the motor

Posted on Jul 21, 2009

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