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2002 BMW 530i Engine misfirre

Tiny
BILL HERNANDEZ
  • MEMBER
  • 2002 BMW 530I
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 146,000 MILES
Engine misfire at low RPM. Changed spark pugs and still missing. OBD II codes show all 6 ciylinders missfiring, plus PO0300 code. Seems to accelerate just fine.
Friday, March 5th, 2010 AT 2:33 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following:
1. Defective spark plug.
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
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Friday, March 5th, 2010 AT 3:22 PM

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