2004 Ford Focus Engine misfires

Tiny
AC2211
  • MEMBER
  • 2004 FORD FOCUS
  • 4 CYL
  • FWD
  • MANUAL
  • 140,000 MILES
Engine misfires on acceleration and also at idle. This problem has gotten progressily worse.
Sunday, January 17th, 2010 AT 4:51 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
An engine misfiring can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
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Sunday, January 17th, 2010 AT 10:05 PM

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