1992 Nissan 240SX misfiring

Tiny
NUGGET024
  • MEMBER
  • 1992 NISSAN 240SX
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 10,000 MILES
My friend's car vibrates terribly. He has changed the gas filter, spark plugs, oil, and spark plug wiring. The car still shakes and the first spark plug is still not working (he pulls it out and the engine still runs "like normal" but if he pulls another one out it does not). Do you have any suggestions on what to look for. It would really be appreciated.
Monday, August 24th, 2009 AT 10:36 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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Tuesday, August 25th, 2009 AT 12:36 AM

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