The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - HELP...1986 C20 5.7....smog removed,,,Check engine light???

72freak · 08-11-2010, 03:50 PM

I dont have any experience with this crazy pre-87 emissions stuff. I dont have another one close by to compare it to.......We picked up this crew cab a few weeks ago.....running great. It looks like there may have been a smog pump at one time that was cut off??? A few tube things up top on each side and two plugs that go no where. It will throw a "check engine" light when on the highway. I am sure it has something to do with the unplugged stuff.

1) any pictures of what is should look like?
2)Will the plugs that arent hooked up effect this check engine light?
3)If so can they be jumped off?
4)Where do these pinched off tubes up top go to?
5) CHECK ENGINE LIGHT....are you kidding me...WHY? Whats it supposed to be telling me?

Im sure I will eventually change the intake, carb and exhaust, but for now Id like to make sure its right.

Thanks for your help!

08-11-2010, 03:50 PM	#1
72freak Rottenwood Garage Member Join Date: May 2005 Location: Marietta, Georgia Posts: 4,321	HELP...1986 C20 5.7....smog removed,,,Check engine light??? I dont have any experience with this crazy pre-87 emissions stuff. I dont have another one close by to compare it to.......We picked up this crew cab a few weeks ago.....running great. It looks like there may have been a smog pump at one time that was cut off??? A few tube things up top on each side and two plugs that go no where. It will throw a "check engine" light when on the highway. I am sure it has something to do with the unplugged stuff. 1) any pictures of what is should look like? 2)Will the plugs that arent hooked up effect this check engine light? 3)If so can they be jumped off? 4)Where do these pinched off tubes up top go to? 5) CHECK ENGINE LIGHT....are you kidding me...WHY? Whats it supposed to be telling me? Im sure I will eventually change the intake, carb and exhaust, but for now Id like to make sure its right. Thanks for your help! Attached Images __________________ 2004 Chevrolet Suburban C1500 2001 Chevrolet 2500HD Crew 6.0 1999 Harley Davidson Electra Glide 1972 Chevrolet C-20 Custom Camper "Dump Truck" 1972 Chevrolet C-20 Suburban "Big Green" 1969 Chevrolet C-50 Wedge Hauler "Leonidis" 1966 C-10 2x4 short fleet 327 4 speed "Race Truck" 1952 Plymouth Cranbrook "Rican" (my grandfathers) 1931 Ford Model A Coupe "Black Beauty" 1930 Ford Model A truck "Club Cab" 4x4 Rottenwood Garage and Speed Shop.....where everything must be racy! *It's not just a hobby..It's a LIFESTYLE!!!* Thanks for nothing Barrett-Jackson You cant fix stupid or teach accountability! Time wasters, looky Lous and tire kickers are everywhere! Last edited by 72freak; 08-11-2010 at 03:53 PM.