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high CO 83 305

  #1  
Old 12-28-2010, 04:37 PM
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Default high CO 83 305

I have a 1985 K5 with a 305. Took it in for smog, and failed. The high speed CO is 1.31% and is not to be higher than 1.20% Can You help?
 
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Old 12-29-2010, 01:43 PM
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Are you running a cat and what is the HC at.
 
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Old 12-30-2010, 02:29 AM
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I got it the timing was to far advanced. Thanks, JIM
 
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