The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

76er · 04-15-2018, 11:53 AM

Hello, have 1990 Silverado 1/2 ton, 2 wheei drive, 350 engine, extended cab.
Smog pump missing off this truck and won't pass inspection in my state, only requires safety inspection but if it came with pump has to have it on there. Willing to buy one but don't know if im missing what ever the pump connects to
so i've been searching everywhere for a diagram of the emmissions system for my truck with no luck, have found a couple that supposedly are for my truck but it shows it with the air injection pipes that screw into the heads like the 80s model trucks and these models didn't have those, even my Chilton manual doesn't show mine. Does anyone have a diagram or know what the pump attaches to? 1988 to 1993 are the same, 1994 and newer are different. Thanks for any help.

04-15-2018, 11:53 AM	#1
76er Registered User Join Date: Jan 2011 Location: greensboro n.c. Posts: 51	Need emissions help Hello, have 1990 Silverado 1/2 ton, 2 wheei drive, 350 engine, extended cab. Smog pump missing off this truck and won't pass inspection in my state, only requires safety inspection but if it came with pump has to have it on there. Willing to buy one but don't know if im missing what ever the pump connects to so i've been searching everywhere for a diagram of the emmissions system for my truck with no luck, have found a couple that supposedly are for my truck but it shows it with the air injection pipes that screw into the heads like the 80s model trucks and these models didn't have those, even my Chilton manual doesn't show mine. Does anyone have a diagram or know what the pump attaches to? 1988 to 1993 are the same, 1994 and newer are different. Thanks for any help.