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

72freak · 08-13-2010, 04:43 PM

There is NO OB port under the dash and NO electronic carb.

No port=no codes to repot.

Lots of smog stuff, Check engine light and I cant remember if i mentioned it before....it also has a stupid CHOKE light that glows now and again. What was GM thinking?

CaliDude76 · 08-13-2010, 07:16 PM

Quote:

Originally Posted by 72freak

There is NO OB port under the dash and NO electronic carb.

No port=no codes to repot.

Lots of smog stuff, Check engine light and I cant remember if i mentioned it before....it also has a stupid CHOKE light that glows now and again. What was GM thinking?

ehhh.. it was the 80's,... they were trying to be all "sophisticated" with the computer controlled stuff.. but bombed apparently.. I mean look at the early 80's Caddy's with the 4,6,8 HT electronically controlled engines that failed miserably.. Got a hand it to em for giving it a shot. They got better with time though....

72freak · 08-14-2010, 04:14 PM

Any other ideas why it would be throwing a check engine light?
If unplugged smog wont do it and it does not have a computer.....what throws the light?

cableguy0 · 08-14-2010, 04:17 PM

If it doesnt have the electronic carb and the rest of the stuff associated with that. If you cant find a diagnostic port and theres no computer just take the bulb out of the dash so it doesnt light up anymore.

72freak · 08-14-2010, 06:31 PM

Quote:

Originally Posted by cableguy0

If it doesnt have the electronic carb and the rest of the stuff associated with that. If you cant find a diagnostic port and theres no computer just take the bulb out of the dash so it doesnt light up anymore.

Thats what is going to happen but I am one of those "figure it out" types so the search goes on!

cableguy0 · 08-14-2010, 06:45 PM

Theres probably nothing to figure out. If theres no computer and no sensors to read. The light is simply lit because it has power to it from somewhere. trace some wires under the dash. If the choke light acts up too there could just be a wiring issue behind the dash or cluster.

72freak · 08-14-2010, 08:26 PM

Quote:

Originally Posted by cableguy0

Theres probably nothing to figure out. If theres no computer and no sensors to read. The light is simply lit because it has power to it from somewhere. trace some wires under the dash. If the choke light acts up too there could just be a wiring issue behind the dash or cluster.

It comes on only at higher speeds/longer drives (normally on the interstate)
It will go back out when you shut the truck off and it will stay off untill you are back on the interstate. It never comes on driving around town.

08-13-2010, 04:43 PM	#1
72freak Rottenwood Garage Member Join Date: May 2005 Location: Marietta, Georgia Posts: 4,321	Re: HELP...1986 C20 5.7....smog removed,,,Check engine light??? There is NO OB port under the dash and NO electronic carb. No port=no codes to repot. Lots of smog stuff, Check engine light and I cant remember if i mentioned it before....it also has a stupid CHOKE light that glows now and again. What was GM thinking? __________________ 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; 08-13-2010 at 04:43 PM.

08-14-2010, 04:14 PM	#3
72freak Rottenwood Garage Member Join Date: May 2005 Location: Marietta, Georgia Posts: 4,321	Re: HELP...1986 C20 5.7....smog removed,,,Check engine light??? Any other ideas why it would be throwing a check engine light? If unplugged smog wont do it and it does not have a computer.....what throws the light? __________________ 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!

08-14-2010, 04:17 PM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: HELP...1986 C20 5.7....smog removed,,,Check engine light??? If it doesnt have the electronic carb and the rest of the stuff associated with that. If you cant find a diagnostic port and theres no computer just take the bulb out of the dash so it doesnt light up anymore. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

08-14-2010, 06:45 PM	#6
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: HELP...1986 C20 5.7....smog removed,,,Check engine light??? Theres probably nothing to figure out. If theres no computer and no sensors to read. The light is simply lit because it has power to it from somewhere. trace some wires under the dash. If the choke light acts up too there could just be a wiring issue behind the dash or cluster. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.



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