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What would cause high highdrocarbon readings during smog check?
Wiki User
∙ 12y ago
Bad rings, bad valve seals, bad o2 sensors front and back or front or back. Plugged injectors, spark plug miss firing, bad wiring, bad coils, A hole in a piston, a bad cataylitic converter where it has been bumped or hit some way to damage the inside honey comb iridium. Junk yards like to get converters to reap the iridium. It costs about $1000 to 1200 dollars an ounce according to the market. They don't make that much but the do pretty good. Also, high hydrocarbons can come from the fuel you burn. If it is too low in octane smog builds up. If water has gotten in you gas or your car has set around and gotten condensation in it Also check for a clogged up exhaust pipe. That will do it.
Wiki User
∙ 12y ago
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