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Old 11-03-2008, 10:20 AM   #28
91chevywt
 
Join Date: Jul 2008
Location: NJ
Posts: 819
iTrader: (2)
You are running rich, or timing is too retarded. high HC, high CO, low NOx = running rich or timing too retarded. EGR wouldn't help you, its main purpose is to reduce NOx. I'd bet if you could bump up timing or lean it out you would see a drastic change.

Hydro Carbons = unburned fuel
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