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WHAT CAUSES HIGH HC's AT IDLE?

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Old Jun 24, 2002 | 04:10 PM
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dvst8-rx7
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WHAT CAUSES HIGH HC's AT IDLE?
hey guys,

was wondering what causes high HC readings at idle?
yeah need this becuz damn yearly emmisions test!.

cheers
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Old Jun 24, 2002 | 05:21 PM
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how high are they? i would look at the air control valve first, then the cats

mike
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Old Jun 24, 2002 | 05:24 PM
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dvst8-rx7
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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?
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Old Jun 24, 2002 | 07:19 PM
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dvst8-rx7
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.............
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Old Jun 24, 2002 | 07:25 PM
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https://www.rx7club.com/forum/showth...threadid=86143
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Old Jun 24, 2002 | 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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Old Jun 25, 2002 | 12:51 AM
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hmm...what do u mean by low voltage? on the plug wires?

cheers
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