1998 Plymouth Voyager check engine / misfire

Tiny
JEFFLAITINEN
  • MEMBER
  • 1998 PLYMOUTH VOYAGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 123,000 MILES
Ok, failed emissions due to OBD failure with random misfire errors. Did tuneup. Plugs wires cap rotor air filter. Reset ecm at the autoparts store. Drove for 50 ish miles, actually passed emissions test but still have a miss and light came back on. Some one told me possibly a bad coil but I always thought a coil was either good or bad, not intermittent. Maybe injector? Ecm? Any suggestions as to what parts to throw at the poor thing. Runs okay if you don't mind a miss. Mostly at idle in drive. Also always has a tick like a lifter when cold.
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Tuesday, March 31st, 2009 AT 8:32 PM

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Tiny
RASMATAZ
  • MEMBER
P0300 Random misfire Normally caused by vacuum leak and bad fuel

Misfires 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, March 31st, 2009 AT 8:37 PM

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