The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 08-16-2010, 10:38 PM   #26
motornut
78 & 79 Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,082
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

yup it's my 85
__________________
John http://www.youtube.com/user/TheMotornut

2002 Fleetwood Prowlerhttp://67-72chevytrucks.com/vboard/s...d.php?t=431859
1978 Suburban4X2-hit while parked RIPzez
1978 OldsCutopless-CanadaDayCar
1978 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...d.php?t=421767
1979 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...=421767&page=2
1979 GMCJimmy4X2-305/350http://67-72chevytrucks.com/vboard/s...=1#post5200107
1987 Suburban4X4-writeoff hit while parked RIPzez
1988 Suburban4X4-writeoff hit while parked RIPzez http://67-72chevytrucks.com/vboard/s...=417457&page=4
1989 Suburban4X2 - square igloo/SOLD
2003 Grand Am 2.2 his DD
2005 Malibu 2.2 her DD
2009 Vibe from Dad
Love em low,but get me higher
motornut is offline   Reply With Quote
Old 08-16-2010, 11:32 PM   #27
clinebarger
Senior Member
 
clinebarger's Avatar
 
Join Date: May 2009
Location: Fort Worth Texas
Posts: 4,767
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

Quote:
Originally Posted by motornut View Post
now i'm curious........not up there?
The shiny aluminum box with the rusty strap holding it up is your ECM.
__________________
1985 Chevy C20 Suburban with a 2004 5.3/4L60E

2006 Chevy 2500HD Crew Cab 6.6 LBZ/Allison 1000
clinebarger is offline   Reply With Quote
Old 08-17-2010, 06:29 AM   #28
motornut
78 & 79 Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,082
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

my fuel pump relay is there on my firewall,whats all the wires on the right?looks like fun there
Attached Images
 
__________________
John http://www.youtube.com/user/TheMotornut

2002 Fleetwood Prowlerhttp://67-72chevytrucks.com/vboard/s...d.php?t=431859
1978 Suburban4X2-hit while parked RIPzez
1978 OldsCutopless-CanadaDayCar
1978 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...d.php?t=421767
1979 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...=421767&page=2
1979 GMCJimmy4X2-305/350http://67-72chevytrucks.com/vboard/s...=1#post5200107
1987 Suburban4X4-writeoff hit while parked RIPzez
1988 Suburban4X4-writeoff hit while parked RIPzez http://67-72chevytrucks.com/vboard/s...=417457&page=4
1989 Suburban4X2 - square igloo/SOLD
2003 Grand Am 2.2 his DD
2005 Malibu 2.2 her DD
2009 Vibe from Dad
Love em low,but get me higher
motornut is offline   Reply With Quote
Old 08-17-2010, 04:05 PM   #29
72freak
Rottenwood Garage Member
 
72freak's Avatar
 
Join Date: May 2005
Location: Marietta, Georgia
Posts: 3,887
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

Quote:
Originally Posted by clinebarger View Post
My 85 3/4 ton Suburban had the same emissions equipment, Dual smog pumps, No catalytic converters, No EST, No feedbak Quadrajet, Dual exhaust, Leaded gasoline compatible.

There is a "smog pump control module" on the firewall. Heres a pic of mine, The circle is where it used to be. It grounds the "check engine light" bulb when a fault is detected in the "Air Diverter solenoid" curcuit. Unplug the module, the light should go out.
WOW.....great info...I had just gotten back from some more picture taking and research and took a picture of that little box on the firewall to find out what it was and if that could be the culprit....I plan to give it a shot next time I drive it. As far as mine goes here is some more info......

Stock true dual exhaust with no Y pipe, no cats and no O2 sensor. It is very obvious this is the original exhaust by the shields all over the pipes.

Absolutley no computer behind the glove box.
Attached Images
  
__________________
1999 Chevrolet Tahoe 4x4
1999 Harley Davidson Electra Glide
1996 Chevrolet C3500 Ex-cab 5.7
1980 Toyota Corolla "Rock-n-Rolla"
1967 C-30 Dually
1966 C-10 2x4 short fleet 327 4 speed "Race Truck"
1952 Plymouth Cranbrook "Rican" (my grandfathers)
1948 Chevrolet Fleetmaster 2 door
1931 Ford Model A, "Hot Rod"
1929 Ford Model A Tudor "El Bano"

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!
72freak is offline   Reply With Quote
Old 08-17-2010, 06:25 PM   #30
clinebarger
Senior Member
 
clinebarger's Avatar
 
Join Date: May 2009
Location: Fort Worth Texas
Posts: 4,767
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

Quote:
Originally Posted by motornut View Post
yup it's my 85
Quote:
Originally Posted by motornut View Post
my fuel pump relay is there on my firewall,whats all the wires on the right?looks like fun there
That doesnt look like a 85, Looks like a 87-91? But to answer your question that is the main harness to your ECM.
__________________
1985 Chevy C20 Suburban with a 2004 5.3/4L60E

2006 Chevy 2500HD Crew Cab 6.6 LBZ/Allison 1000
clinebarger is offline   Reply With Quote
Old 08-19-2010, 04:49 PM   #31
motornut
78 & 79 Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,082
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

mine or his dosn't look 85
__________________
John http://www.youtube.com/user/TheMotornut

2002 Fleetwood Prowlerhttp://67-72chevytrucks.com/vboard/s...d.php?t=431859
1978 Suburban4X2-hit while parked RIPzez
1978 OldsCutopless-CanadaDayCar
1978 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...d.php?t=421767
1979 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...=421767&page=2
1979 GMCJimmy4X2-305/350http://67-72chevytrucks.com/vboard/s...=1#post5200107
1987 Suburban4X4-writeoff hit while parked RIPzez
1988 Suburban4X4-writeoff hit while parked RIPzez http://67-72chevytrucks.com/vboard/s...=417457&page=4
1989 Suburban4X2 - square igloo/SOLD
2003 Grand Am 2.2 his DD
2005 Malibu 2.2 her DD
2009 Vibe from Dad
Love em low,but get me higher
motornut is offline   Reply With Quote
Old 08-19-2010, 08:07 PM   #32
72freak
Rottenwood Garage Member
 
72freak's Avatar
 
Join Date: May 2005
Location: Marietta, Georgia
Posts: 3,887
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

I think he means yours....with that fuel pump relay I believe it should be a throttle body that started in 87....Thats probably what he is talking about.
__________________
1999 Chevrolet Tahoe 4x4
1999 Harley Davidson Electra Glide
1996 Chevrolet C3500 Ex-cab 5.7
1980 Toyota Corolla "Rock-n-Rolla"
1967 C-30 Dually
1966 C-10 2x4 short fleet 327 4 speed "Race Truck"
1952 Plymouth Cranbrook "Rican" (my grandfathers)
1948 Chevrolet Fleetmaster 2 door
1931 Ford Model A, "Hot Rod"
1929 Ford Model A Tudor "El Bano"

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!
72freak is offline   Reply With Quote
Old 08-19-2010, 09:42 PM   #33
motornut
78 & 79 Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,082
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

Well i was told it was a diesel when bought new.but vin says 454 2 wheeler and it's C20-4X4
__________________
John http://www.youtube.com/user/TheMotornut

2002 Fleetwood Prowlerhttp://67-72chevytrucks.com/vboard/s...d.php?t=431859
1978 Suburban4X2-hit while parked RIPzez
1978 OldsCutopless-CanadaDayCar
1978 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...d.php?t=421767
1979 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...=421767&page=2
1979 GMCJimmy4X2-305/350http://67-72chevytrucks.com/vboard/s...=1#post5200107
1987 Suburban4X4-writeoff hit while parked RIPzez
1988 Suburban4X4-writeoff hit while parked RIPzez http://67-72chevytrucks.com/vboard/s...=417457&page=4
1989 Suburban4X2 - square igloo/SOLD
2003 Grand Am 2.2 his DD
2005 Malibu 2.2 her DD
2009 Vibe from Dad
Love em low,but get me higher
motornut is offline   Reply With Quote
Old 08-19-2010, 09:48 PM   #34
motornut
78 & 79 Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,082
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

http://67-72chevytrucks.com/vboard/s...d.php?t=416576

FYI is another 85 not sure if he's tbi too tho,i just asked him
__________________
John http://www.youtube.com/user/TheMotornut

2002 Fleetwood Prowlerhttp://67-72chevytrucks.com/vboard/s...d.php?t=431859
1978 Suburban4X2-hit while parked RIPzez
1978 OldsCutopless-CanadaDayCar
1978 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...d.php?t=421767
1979 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...=421767&page=2
1979 GMCJimmy4X2-305/350http://67-72chevytrucks.com/vboard/s...=1#post5200107
1987 Suburban4X4-writeoff hit while parked RIPzez
1988 Suburban4X4-writeoff hit while parked RIPzez http://67-72chevytrucks.com/vboard/s...=417457&page=4
1989 Suburban4X2 - square igloo/SOLD
2003 Grand Am 2.2 his DD
2005 Malibu 2.2 her DD
2009 Vibe from Dad
Love em low,but get me higher
motornut is offline   Reply With Quote
Old 08-19-2010, 10:38 PM   #35
clinebarger
Senior Member
 
clinebarger's Avatar
 
Join Date: May 2009
Location: Fort Worth Texas
Posts: 4,767
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

I have never seen a 85 chevy/gmc C/K/S/T/M platform have TBI. Even the 85 4.3s had feedback Quadrajets on them.
__________________
1985 Chevy C20 Suburban with a 2004 5.3/4L60E

2006 Chevy 2500HD Crew Cab 6.6 LBZ/Allison 1000

Last edited by clinebarger; 08-19-2010 at 10:42 PM.
clinebarger is offline   Reply With Quote
Old 08-20-2010, 12:22 AM   #36
rfmaster
Registered User
 
rfmaster's Avatar
 
Join Date: Oct 2003
Location: OC CA
Posts: 1,345
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

Quote:
Originally Posted by clinebarger View Post
I have never seen a 85 chevy/gmc C/K/S/T/M platform have TBI. Even the 85 4.3s had feedback Quadrajets on them.
Can you post a photo of your 'fuel mixer' please - suspense is killing me!!!

//RF
__________________
"The Beast"

1975 Chevrolet C20 longbed
350/700R4! with 3inch body lift
Dual Flowmasters Super 40's!
TBI retrofit completed (2007-07-29)
New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)
rfmaster is offline   Reply With Quote
Old 08-20-2010, 06:20 AM   #37
motornut
78 & 79 Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,082
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

I'll get prettier pics this weekend if you want,but the 85 tbi etc was all matching my 87 that i had.I've only since finding this site i've explored rpo's and vin #s,and yes as you say it shouldn't be(just read to do it u have to shave bolts and other stuff?)........So when i turn the key i shouldn't hear the fuel pump humpin,before startin, should be manual pump?And no wires in there either.hmmmm
Attached Images
 
__________________
John http://www.youtube.com/user/TheMotornut

2002 Fleetwood Prowlerhttp://67-72chevytrucks.com/vboard/s...d.php?t=431859
1978 Suburban4X2-hit while parked RIPzez
1978 OldsCutopless-CanadaDayCar
1978 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...d.php?t=421767
1979 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...=421767&page=2
1979 GMCJimmy4X2-305/350http://67-72chevytrucks.com/vboard/s...=1#post5200107
1987 Suburban4X4-writeoff hit while parked RIPzez
1988 Suburban4X4-writeoff hit while parked RIPzez http://67-72chevytrucks.com/vboard/s...=417457&page=4
1989 Suburban4X2 - square igloo/SOLD
2003 Grand Am 2.2 his DD
2005 Malibu 2.2 her DD
2009 Vibe from Dad
Love em low,but get me higher

Last edited by motornut; 08-20-2010 at 06:22 AM.
motornut is offline   Reply With Quote
Old 08-20-2010, 06:40 AM   #38
motornut
78 & 79 Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,082
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

would i have the computer above the glovebox with out tbi,as it would seem it was born with a 454 but sadly it was removed.replaced with a 350........i am asumming the puters don't interchange....i figured the 2x to 4x4 frames/driveline were changed.........but to change the rest?Got any ideas how i would check/know........i posted/started some pics in a build thread...........16 inch tires if i read right?
__________________
John http://www.youtube.com/user/TheMotornut

2002 Fleetwood Prowlerhttp://67-72chevytrucks.com/vboard/s...d.php?t=431859
1978 Suburban4X2-hit while parked RIPzez
1978 OldsCutopless-CanadaDayCar
1978 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...d.php?t=421767
1979 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...=421767&page=2
1979 GMCJimmy4X2-305/350http://67-72chevytrucks.com/vboard/s...=1#post5200107
1987 Suburban4X4-writeoff hit while parked RIPzez
1988 Suburban4X4-writeoff hit while parked RIPzez http://67-72chevytrucks.com/vboard/s...=417457&page=4
1989 Suburban4X2 - square igloo/SOLD
2003 Grand Am 2.2 his DD
2005 Malibu 2.2 her DD
2009 Vibe from Dad
Love em low,but get me higher

Last edited by motornut; 08-20-2010 at 06:52 AM.
motornut is offline   Reply With Quote
Old 08-20-2010, 10:00 AM   #39
rfmaster
Registered User
 
rfmaster's Avatar
 
Join Date: Oct 2003
Location: OC CA
Posts: 1,345
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

Quote:
Originally Posted by motornut View Post
would i have the computer above the glovebox with out tbi,as it would seem it was born with a 454 but sadly it was removed.replaced with a 350........i am asumming the puters don't interchange....i figured the 2x to 4x4 frames/driveline were changed.........but to change the rest?Got any ideas how i would check/know........i posted/started some pics in a build thread...........16 inch tires if i read right?
The CCC (computer controlled carb) used ECM - which is located above globe box. It possible to take later 87+ TBI 350 with ECM and harness and swap it in place of CCC without great deal of effort.

//RF
__________________
"The Beast"

1975 Chevrolet C20 longbed
350/700R4! with 3inch body lift
Dual Flowmasters Super 40's!
TBI retrofit completed (2007-07-29)
New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)
rfmaster is offline   Reply With Quote
Old 08-20-2010, 12:45 PM   #40
72freak
Rottenwood Garage Member
 
72freak's Avatar
 
Join Date: May 2005
Location: Marietta, Georgia
Posts: 3,887
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

Have you run your VIN to confirm its year?
__________________
1999 Chevrolet Tahoe 4x4
1999 Harley Davidson Electra Glide
1996 Chevrolet C3500 Ex-cab 5.7
1980 Toyota Corolla "Rock-n-Rolla"
1967 C-30 Dually
1966 C-10 2x4 short fleet 327 4 speed "Race Truck"
1952 Plymouth Cranbrook "Rican" (my grandfathers)
1948 Chevrolet Fleetmaster 2 door
1931 Ford Model A, "Hot Rod"
1929 Ford Model A Tudor "El Bano"

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; 08-20-2010 at 12:45 PM.
72freak is offline   Reply With Quote
Old 08-20-2010, 01:16 PM   #41
motornut
78 & 79 Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,082
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

yup checked the vin year is right.ownership says C20
__________________
John http://www.youtube.com/user/TheMotornut

2002 Fleetwood Prowlerhttp://67-72chevytrucks.com/vboard/s...d.php?t=431859
1978 Suburban4X2-hit while parked RIPzez
1978 OldsCutopless-CanadaDayCar
1978 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...d.php?t=421767
1979 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...=421767&page=2
1979 GMCJimmy4X2-305/350http://67-72chevytrucks.com/vboard/s...=1#post5200107
1987 Suburban4X4-writeoff hit while parked RIPzez
1988 Suburban4X4-writeoff hit while parked RIPzez http://67-72chevytrucks.com/vboard/s...=417457&page=4
1989 Suburban4X2 - square igloo/SOLD
2003 Grand Am 2.2 his DD
2005 Malibu 2.2 her DD
2009 Vibe from Dad
Love em low,but get me higher
motornut is offline   Reply With Quote
Old 08-21-2010, 02:30 AM   #42
HOGDADDY
Registered User
 
HOGDADDY's Avatar
 
Join Date: Jul 2006
Location: Alabama
Posts: 577
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

Quote:
Originally Posted by motornut View Post
now i'm curious........not up there?
That box above the heater/ac box is the computer (ECM). You will need to change out distributors to an older pre-81 HEI and if carb has wires for mixture it will need to be changed.

Also in pic looks like your heater/ac diverter valve is broken.

http://67-72chevytrucks.com/vboard/s...diverter+valve

Last edited by HOGDADDY; 08-21-2010 at 02:30 AM.
HOGDADDY is offline   Reply With Quote
Old 08-21-2010, 10:31 AM   #43
rfmaster
Registered User
 
rfmaster's Avatar
 
Join Date: Oct 2003
Location: OC CA
Posts: 1,345
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

Quote:
Originally Posted by motornut View Post
I'll get prettier pics this weekend if you want,but the 85 tbi etc was all matching my 87 that i had.I've only since finding this site i've explored rpo's and vin #s,and yes as you say it shouldn't be(just read to do it u have to shave bolts and other stuff?)........So when i turn the key i shouldn't hear the fuel pump humpin,before startin, should be manual pump?And no wires in there either.hmmmm
Actually there is a harness, but with air filter on you can not see it. ECM harness is placed on the right (passenger) side of intake - injectors, TPS, IAC, CTS, EGR and AIR form a rather thick bundle. Can not miss it. Going to carb is a wrong approach.

//RF
__________________
"The Beast"

1975 Chevrolet C20 longbed
350/700R4! with 3inch body lift
Dual Flowmasters Super 40's!
TBI retrofit completed (2007-07-29)
New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)
rfmaster is offline   Reply With Quote
Old 08-22-2010, 06:33 AM   #44
72freak
Rottenwood Garage Member
 
72freak's Avatar
 
Join Date: May 2005
Location: Marietta, Georgia
Posts: 3,887
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

OK.........There were two plugs in the bottom of this "smog pump control module". One plug has about 5 wires and the other has 2 wires. I unplugged both sets and the check engine light as mentioned above has NOT come back on. I have watched the truck closely and everything seems to work correctly.

Anyone know what these 2 plugs route to? The 5 wire and the 2 wire?With the info given above Im sure its all smog related but thats a lot of wires for just the smog system. I want to make sure I dont unplug something needed.
Attached Images
 
__________________
1999 Chevrolet Tahoe 4x4
1999 Harley Davidson Electra Glide
1996 Chevrolet C3500 Ex-cab 5.7
1980 Toyota Corolla "Rock-n-Rolla"
1967 C-30 Dually
1966 C-10 2x4 short fleet 327 4 speed "Race Truck"
1952 Plymouth Cranbrook "Rican" (my grandfathers)
1948 Chevrolet Fleetmaster 2 door
1931 Ford Model A, "Hot Rod"
1929 Ford Model A Tudor "El Bano"

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; 08-22-2010 at 06:38 AM.
72freak is offline   Reply With Quote
Old 08-22-2010, 07:38 AM   #45
palposity
Registered User
 
palposity's Avatar
 
Join Date: Sep 2009
Location: Syracuse NY
Posts: 658
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

Quote:
Originally Posted by 72freak View Post
OK.........There were two plugs in the bottom of this "smog pump control module". One plug has about 5 wires and the other has 2 wires. I unplugged both sets and the check engine light as mentioned above has NOT come back on. I have watched the truck closely and everything seems to work correctly.

Anyone know what these 2 plugs route to? The 5 wire and the 2 wire?With the info given above Im sure its all smog related but thats a lot of wires for just the smog system. I want to make sure I dont unplug something needed.
I am very curious as to the answer to this question as well! I have an 86 de-smogged K20 and have had the same struggles with check engine and choke light as you. I am tearing it apart for restoration now and was wondering what that box was for. This thread has helped me a ton! Thanks for posting it!
__________________
Project #1 "Pops"--1980 Chevrolet Scottsdale C10 3rd Generation in the same original owner family. GOAL: Restore to "almost" original.
View Project Pops HERE

Project #2 "Cletus"--1986 Chevy K20 4.10 Gear Ratio GOAL: Restore into a heavy duty work/plow rig
View Project Cletus HERE

DD--2007 Duramax DRW CCLB LT3
palposity is offline   Reply With Quote
Old 08-22-2010, 04:20 PM   #46
72freak
Rottenwood Garage Member
 
72freak's Avatar
 
Join Date: May 2005
Location: Marietta, Georgia
Posts: 3,887
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

Quote:
Originally Posted by palposity View Post
I am very curious as to the answer to this question as well! I have an 86 de-smogged K20 and have had the same struggles with check engine and choke light as you. I am tearing it apart for restoration now and was wondering what that box was for. This thread has helped me a ton! Thanks for posting it!
Someone with a good service manual and a complete wiring schematic should be able to answer all the questions. I was glad we finally got some great info......I knew there was a real answer to the symptoms!!! "There is nothing to figure out, its just an electrical problem, a gremlin, take out the bulb and smog pump wont throw a check engine light" was not really the answer or solution I was looking for.
__________________
1999 Chevrolet Tahoe 4x4
1999 Harley Davidson Electra Glide
1996 Chevrolet C3500 Ex-cab 5.7
1980 Toyota Corolla "Rock-n-Rolla"
1967 C-30 Dually
1966 C-10 2x4 short fleet 327 4 speed "Race Truck"
1952 Plymouth Cranbrook "Rican" (my grandfathers)
1948 Chevrolet Fleetmaster 2 door
1931 Ford Model A, "Hot Rod"
1929 Ford Model A Tudor "El Bano"

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; 08-22-2010 at 04:21 PM.
72freak is offline   Reply With Quote
Old 08-23-2010, 09:11 AM   #47
clinebarger
Senior Member
 
clinebarger's Avatar
 
Join Date: May 2009
Location: Fort Worth Texas
Posts: 4,767
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

Quote:
Originally Posted by 72freak View Post
OK.........There were two plugs in the bottom of this "smog pump control module". One plug has about 5 wires and the other has 2 wires. I unplugged both sets and the check engine light as mentioned above has NOT come back on. I have watched the truck closely and everything seems to work correctly.

Anyone know what these 2 plugs route to? The 5 wire and the 2 wire?With the info given above Im sure its all smog related but thats a lot of wires for just the smog system. I want to make sure I dont unplug something needed.
This is the only diagram I chould find, It only shows the 5 wire connector? Im not sure on the 2 wire connector.....Its been 6 year since i ripped all this stuff off mine. What colors are the 2 wires?
Attached Images
 
__________________
1985 Chevy C20 Suburban with a 2004 5.3/4L60E

2006 Chevy 2500HD Crew Cab 6.6 LBZ/Allison 1000
clinebarger is offline   Reply With Quote
Old 08-23-2010, 10:39 AM   #48
72freak
Rottenwood Garage Member
 
72freak's Avatar
 
Join Date: May 2005
Location: Marietta, Georgia
Posts: 3,887
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

WOW....great info.....I guess you just confirmed the smog stuff DOES run through the check engine light!!!!!

I am going to plug the 2 wire back in and see if I notice anything.
__________________
1999 Chevrolet Tahoe 4x4
1999 Harley Davidson Electra Glide
1996 Chevrolet C3500 Ex-cab 5.7
1980 Toyota Corolla "Rock-n-Rolla"
1967 C-30 Dually
1966 C-10 2x4 short fleet 327 4 speed "Race Truck"
1952 Plymouth Cranbrook "Rican" (my grandfathers)
1948 Chevrolet Fleetmaster 2 door
1931 Ford Model A, "Hot Rod"
1929 Ford Model A Tudor "El Bano"

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!
72freak is offline   Reply With Quote
Old 08-24-2010, 10:41 AM   #49
motornut
78 & 79 Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,082
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

The pic i took while i was repairing the heater core and that valve,i use it to show why the air box don't work right,and where it would/how it would be broken,and where the ECM is .........and i too hope to be smog free
__________________
John http://www.youtube.com/user/TheMotornut

2002 Fleetwood Prowlerhttp://67-72chevytrucks.com/vboard/s...d.php?t=431859
1978 Suburban4X2-hit while parked RIPzez
1978 OldsCutopless-CanadaDayCar
1978 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...d.php?t=421767
1979 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...=421767&page=2
1979 GMCJimmy4X2-305/350http://67-72chevytrucks.com/vboard/s...=1#post5200107
1987 Suburban4X4-writeoff hit while parked RIPzez
1988 Suburban4X4-writeoff hit while parked RIPzez http://67-72chevytrucks.com/vboard/s...=417457&page=4
1989 Suburban4X2 - square igloo/SOLD
2003 Grand Am 2.2 his DD
2005 Malibu 2.2 her DD
2009 Vibe from Dad
Love em low,but get me higher
motornut is offline   Reply With Quote
Old 08-24-2010, 06:25 PM   #50
motornut
78 & 79 Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,082
Re: HELP...1986 C20 5.7....smog removed,,,Check engine light???

my 1985 sub intake
Attached Images
 
__________________
John http://www.youtube.com/user/TheMotornut

2002 Fleetwood Prowlerhttp://67-72chevytrucks.com/vboard/s...d.php?t=431859
1978 Suburban4X2-hit while parked RIPzez
1978 OldsCutopless-CanadaDayCar
1978 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...d.php?t=421767
1979 GMCJimmy4X4-350/203http://67-72chevytrucks.com/vboard/s...=421767&page=2
1979 GMCJimmy4X2-305/350http://67-72chevytrucks.com/vboard/s...=1#post5200107
1987 Suburban4X4-writeoff hit while parked RIPzez
1988 Suburban4X4-writeoff hit while parked RIPzez http://67-72chevytrucks.com/vboard/s...=417457&page=4
1989 Suburban4X2 - square igloo/SOLD
2003 Grand Am 2.2 his DD
2005 Malibu 2.2 her DD
2009 Vibe from Dad
Love em low,but get me higher
motornut is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 05:20 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com