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Topic: Remove AIR on my 81

in Forum: C3 Engines


Remove AIR on my 81

Posted: 11/13/20 12:34pm Message 1 of 13
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Bay City, MI - USA
Joined: 9/29/2020
Posts: 28
Vette(s): 1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015

So starting removing my AIR pump and hoses, what are the two electrical plugs and will the computer know they are not hooked up anymore🤔 Thanks ! 




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Re: Remove AIR on my 81

Posted: 11/13/20 7:39pm Message 2 of 13
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

A pic with the pump still installed would help, but I can check the service manual and see what the two connectors are for. I do not think it will turn the "Service Engine" light on, but it might. The '81 ECMs are pretty primitive. It really only controls the fuel mixture at idle speed on the carb, and the ignition advance to a degree.




Joel Adams
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Re: Remove AIR on my 81

Posted: 11/13/20 8:57pm Message 3 of 13
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Bay City, MI - USA
Joined: 9/29/2020
Posts: 28
Vette(s): 1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015

 

Waiting for my shop manual to get here, thanks! 




Re: Remove AIR on my 81

Posted: 11/14/20 8:36am Message 4 of 13
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

From the second pic, it looks like both connectors go to the diverter valve. That valve determines whether or not to send fresh air into the exhaust downstream. Removing the AIR system is going to effect the 02 sensor readings, also, which will typically get you the dreaded "Service Engine" light, and it would eliminate the mixture control for the carb. It would not, however, effect the ignition timing.




Joel Adams
C3VR Lifetime Member #56    

My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Re: Remove AIR on my 81

Posted: 11/14/20 1:43pm Message 5 of 13
Former Member
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Bay City, MI - USA
Joined: 9/29/2020
Posts: 28
Vette(s): 1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015

Adams Apple,  thanks for the information, have heard the ccm also controls the lockup converter as well?  Temporally before I get new exhaust manifolds will plug the tubes going to them and also the one to converter. Too bad the injector pipes are welded to the manifolds , would be nice to just plug them




Re: Remove AIR on my 81

Posted: 11/14/20 7:05pm Message 6 of 13
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

It does send the command for lock-up to the trans. I do not think having an AIR related code would keep the lu from working. Even if it did, it would not be a big issue, unless you drive a lot of hiway miles.




Joel Adams
C3VR Lifetime Member #56    

My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Re: Remove AIR on my 81

Posted: 11/17/20 2:51pm Message 7 of 13
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Bay City, MI - USA
Joined: 9/29/2020
Posts: 28
Vette(s): 1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015

Getting things back together after cleaning and painting some things and I have a mystery wire that I am not sure where it goes....any ideas will be much appreciated!  in the picture its near the AC compressor. My shop manual is on order but not here yet, sorry to be a pest. It has a green plug on the end.




Re: Remove AIR on my 81

Posted: 11/17/20 7:21pm Message 8 of 13
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Looking at your second pic above, I can see that connector right under the diverter valve. Does it not go to the valve? What color is the wire?

I do have all of the wiring diagrams available on my WEB PAGE, if you would like to download, or just have a look-see. 🤠




Joel Adams
C3VR Lifetime Member #56    

My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Re: Remove AIR on my 81

Posted: 11/18/20 11:05am Message 9 of 13
Former Member
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Bay City, MI - USA
Joined: 9/29/2020
Posts: 28
Vette(s): 1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015

Its a light green wire,  I looked at the Pump and see again where the two other plugs go but didnt see this one. I will look at your web page and see, thanks!  




Re: Remove AIR on my 81

Posted: 11/18/20 4:18pm Message 10 of 13
Former Member
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Bay City, MI - USA
Joined: 9/29/2020
Posts: 28
Vette(s): 1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015

Looking again at my pictures before taking apart it seems it was not hooked up to anything? I checked the wiring diagram , wow! so many things going on....The plug is male inside the plastic so would have to connect with female somewhere?




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