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Forum > Failed Smog Test > Question

1993 Oldsmobile Bravada failed for high HC

My Bravada failed only hydrocarbon. MAX Allowed was 100... my results showed 151 ppm. The oil was changed 1000 miles ago. I put new plugs, wires, rotor, distributor and cap. New air cleaner and gas cap and new 02 sensor (Bosch). Hydrocarbon is carbon plus hydrogen (that's easy). How do I lower the hydrocarbons to pass smog test? (that' hard)!
Answer:

We need to find out if your Oldsmobile is in proper fuel control as part of the high HC diagnosis. This includes ensuring the oxygen sensor is working properly, your vehicle's emissions computer is receiving the signals from the oxygen sensor, the computer is computing the data properly and sending the correct signals to the fuel injectors to either increase or decrease fuel delivery to the combustion chambers. The problem may be more complicated then simply changing emissions components. posted by SmogTips Support

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