WHAT CAUSES HIGH HC's AT IDLE?
06-24-02, 05:21 PM
#2
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how high are they? i would look at the air control valve first, then the cats
mike
mike
06-24-02, 05:24 PM
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i did the test today n failed becuz of only high HC's at idle, but passed everything else. my reading was 800ppm and the limit was 400ppm. yeah kinda off bad...ive already checked the ACV and works normally but could be missing some tests...any others?
06-24-02, 07:25 PM
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06-24-02, 09:48 PM
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Watch your voltage at idle. If your voltage is low at idle, there wont be a hot enough spark to properly ignite the fuel. If your voltage low at idle and normal just above 1000 RPM, increase your idle speed. It has worked for me in the past.
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