knocking at idle

2002 FORD FOCUS
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PUFFNSTUFF
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2002 focus has a knocking at idle that seems to get louder while driving. check engine came on for one day and had a code of po304, cylinder 4 misfire, but went back off the following day.For awhile the knock was intermittant, but now it is constant. Anyone have any idea what would cause this?

Thanks!!
Aug 31, 2011 at 1:07 AM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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The cylinder miss could be many things, plug, coil, injector, low compression... If the knock is in the engine, it could be a rod bearing, main bearing, wrist pin... Make sure the oil is clean and full and I recommend that you allow a mechanic to listen to it to identify where the noise is coming from.

If you have other questions, let me know.

Joe
Aug 31, 2011 at 1:42 AM
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PUFFNSTUFF
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Car runs fine and there is no loss of power...is it possible that it could be a pulley or belt tensioner?

Thanks!!
Aug 31, 2011 at 1:25 PM