Smog failure with 85 feedback carb 350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JohnKimble · 06-07-2018, 08:43 AM

Hello,

Went to smog the 85 k10 today and failed. The HC and CO limits were so high it was in the gross pollution threshold. The engine is stock with all smog equipment still hooked up and running. Recently did the cap, rotor, wires, plugs and oil. Air filter is good.

The smog guys were surprised because of how well the truck runs and how terribly it failed. The only thing I could think of was that I had the battery unplugged and charging since the truck has been garaged for the last 6 months. I filled it with premium on my way to the smog shop and ran it warm to heat up the cat.

Could it be the 10 mile and 20 minute distance wasn't enough for the computer to calibrate the feedback carb, or is that not how it works?

06-07-2018, 08:43 AM	#1
JohnKimble Registered User Join Date: May 2014 Location: CA Posts: 152	Smog failure with 85 feedback carb 350 Hello, Went to smog the 85 k10 today and failed. The HC and CO limits were so high it was in the gross pollution threshold. The engine is stock with all smog equipment still hooked up and running. Recently did the cap, rotor, wires, plugs and oil. Air filter is good. The smog guys were surprised because of how well the truck runs and how terribly it failed. The only thing I could think of was that I had the battery unplugged and charging since the truck has been garaged for the last 6 months. I filled it with premium on my way to the smog shop and ran it warm to heat up the cat. Could it be the 10 mile and 20 minute distance wasn't enough for the computer to calibrate the feedback carb, or is that not how it works? Attached Images



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