ENGINE MISSES AT IDLE AND THROUGHOUT DRIVING RANGE, OBD CODE P0300

  • Tiny
  • nhunt001
  • 1998 Mercury Villager
  • 168,000 miles

Van drove fine yesterday morning anf then in the afternoon it ran really rough, and the CEL light came on. I read the codes P0325, and P0306. I check the fuel injector in the 6th cylinder and it was not functioning properly replaced it, and now I ge the same rough idle and missing through driving range, but the code is now P0300. What could it be and where do I start. I have recently replaced the cap, rotor, spark plugs, wires, and distributor.

Monday, August 6th, 2012 AT 2:59 PM

1 Answer

  • Tiny
  • hmac300
  • Expert
  • 41,607 posts

Check your fuel pressure if it's low it will cause this code. If still screwed up check for vacuum leak as well. Fuel pressure shold be 37-43 psi if below that then it's a fuel pump or filter clogged.

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Monday, August 6th, 2012 AT 3:16 PM

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