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2000 Infiniti I30 P0300 error code

Tiny
ORLANDONOVICE
  • MEMBER
  • 2000 INFINITI I30
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
My local parts house ran a diagnostic and came up P0300 troubleshooting. Random cylinder misfire. It is a fuel system malfunction, ignition fault, vacuum leak, or engine mechanical. Is there any way I can narrow down the problem? Sometimes the engine runs as smooth as new, and other times runs as though a cylinder is not firing. The service soon light also is intermittent on and off.
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Monday, March 15th, 2010 AT 9:27 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0300 Random misfire is normally caused by vacuum leaks and contaminated fuel-
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Monday, March 15th, 2010 AT 9:35 PM
Tiny
ORLANDONOVICE
  • MEMBER
  • 4 POSTS
Is there a systematic way of detecting the vacuum leaks? I have had the dealership look at the car, and after a several hundred dollar bill it continues to do the same thing.

Fuel seems to have no effect.
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Tuesday, March 16th, 2010 AT 7:39 AM
Tiny
ORLANDONOVICE
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  • 4 POSTS
Is there a systematic way of detecting the vacuum leaks? I have had the dealership look at the car, and after a
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Tuesday, March 16th, 2010 AT 7:54 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Other causes on misfiring engine

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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Tuesday, March 16th, 2010 AT 9:49 AM

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