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6

The fact that you can smell fuel in the exhaust is a strong indication that the engine is running rich. This means that there is more fuel than required by the engine. There are many things which could cause this and the sensible course of action would involve hooking the engine computer to a scan tool to retrieve data about fuel trims, and O2 sensor ...


3

Sounds like a possible evaporative system issue involving the purge valves that vent fuel vapor from the gas tank. If the OBDII -on board diagnostic code that triggers the check engine light is P0440 then that is the issue. If the purge valve remains open for too long it will eventually damage the catalytic converters by sending too much unburnt fuel ...


1

O2 sensors are interesting critters to diagnose. The ones at the upstream side of the Cats are the ones that send data to the ECM module continuously for keeping the air/fuel ratios optimum. The downstream O2 sensors for the most part do absolutely nothing throughout their service life. Their purpose is to monitor the condition of the Cats. If the Cats are ...



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