2000 Infiniti I30 P0300 error code

2000 INFINITI I30
130,000 MILES • 6 CYL • 2WD • AUTOMATIC
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ORLANDONOVICE
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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.
Mar 15, 2010 at 9:27 PM
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RASMATAZ
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P0300 Random misfire is normally caused by vacuum leaks and contaminated fuel-
Mar 15, 2010 at 9:35 PM
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ORLANDONOVICE
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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.
Mar 16, 2010 at 7:39 AM
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ORLANDONOVICE
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Is there a systematic way of detecting the vacuum leaks? I have had the dealership look at the car, and after a
Mar 16, 2010 at 7:54 AM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
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.
Mar 16, 2010 at 9:49 AM
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