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P300B Diagnostic Trouble Code Discussion for July 2005

cyl. misfire

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Trouble Ticket Help Requests for DTC P300B
Help Request Posted
1999 Chevrolet C1500 Suburban 5.7L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GKEC16R6X
P300B: cyl. misfire. Came in with running rich (black exhaust). We found thermostat stock open, clogged fuel and air filter, check engine light with codes p0154b, p1153b o2 circuit insufficent activity B2S1 and p300 random misfire. We replaced thermostat, fuel and air filter, O2 B...
July 14, 2005