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2002 Questions for all other cars mis firing

Tiny
MARIAM12UK
  • MEMBER
  • 2002 ALL OTHER MAKES ALL OTHER MODELS
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 71,000 MILES
Hi I have a smart fortwo. It is misfiring from 2 month now I have changed the coil pack 3 times. Put all new as well but no use. It is vibrating and I dont know what to do. Pls help
Friday, July 17th, 2009 AT 10:29 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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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Friday, July 17th, 2009 AT 10:41 PM

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