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Old 08-24-2011, 09:26 PM   #1
Infamax
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Join Date: Apr 2005
Location: Yuba City (Nor Cal)
Age: 32
Posts: 223
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Failed Smog, high HC at idle

I've searched and tried various things. I've changed spark plugs, O2 sensor, CTS, vacuum lines, cleaned the maf, new air filter, changed cap and rotor, checked timing and set idle multiple times, and I still haven't been able to pass the sniffer.

The HC and CO are high at idle. Once the rpms starting going up, the smog numbers go down. As soon as the smog tech lets off the throttle and the motor gets to idle speed, the HC start shooting up. The numbers are fine anytime besides right at idle.

I'm at a lose, any help would be appreciated. I've included a pic of my smog sheet.
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