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Engine misfiring, codes, P0300, P0303, P1313, P1314

Tiny
LAURA ADAMS-DURGIN
  • MEMBER
  • 1997 JAGUAR XJ6
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Engine is misfiring. Engine hunts sometimes while coasting. Have replaced the spark plugs, ignition coils, and the catalytic converter under the engine. Exhaust smelled of unburnt gas until cat was changed, but that smell has now gone away.
Wednesday, December 7th, 2016 AT 12:32 AM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Check for vacuum leaks and do a compression test. Replace ignition leads if not already done and inspect distributor cap for cracking internally, you may see black carbon tracks between posts. Check fuel pressure and fuel filter for hunting, start here.
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Wednesday, December 7th, 2016 AT 4:30 AM

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