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Knocking at idle

Tiny
PUFFNSTUFF
  • MEMBER
  • 2002 FORD FOCUS
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!
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Wednesday, August 31st, 2011 AT 1:07 AM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,233 POSTS
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
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Wednesday, August 31st, 2011 AT 1:42 AM
Tiny
PUFFNSTUFF
  • MEMBER
  • 59 POSTS
Car runs fine and there is no loss of power. Is it possible that it could be a pulley or belt tensioner?

Thanks!
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Wednesday, August 31st, 2011 AT 1:25 PM

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