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Topic: Remove AIR on my 81

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Remove AIR on my 81 (1/12)
 11/13/20 2:34pm
TTJR 81
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Bay City, MI - USA

Vette(s):
1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015


Joined: 9/29/2020
Posts: 24

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 (2/12)
 11/13/20 9:39pm
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Duncanville, TX - USA

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#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


Joined: 11/8/2003
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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.



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Joel Adams
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Re: Remove AIR on my 81 (3/12)
 11/13/20 10:57pm
TTJR 81
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Bay City, MI - USA

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1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015


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Waiting for my shop manual to get here, thanks! 

Re: Remove AIR on my 81 (4/12)
 11/14/20 10:36am
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Duncanville, TX - USA

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#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


Joined: 11/8/2003
Posts: 19782

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.



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Joel Adams
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Re: Remove AIR on my 81 (5/12)
 11/14/20 3:43pm
TTJR 81
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Bay City, MI - USA

Vette(s):
1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015


Joined: 9/29/2020
Posts: 24

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 (6/12)
 11/14/20 9:05pm
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Duncanville, TX - USA

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


Joined: 11/8/2003
Posts: 19782

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.



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Joel Adams
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Re: Remove AIR on my 81 (7/12)
 11/17/20 4:51pm
TTJR 81
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Bay City, MI - USA

Vette(s):
1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015


Joined: 9/29/2020
Posts: 24

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 (8/12)
 11/17/20 9:21pm
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Duncanville, TX - USA

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


Joined: 11/8/2003
Posts: 19782

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. 🤠



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Joel Adams
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             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 (9/12)
 11/18/20 1:05pm
TTJR 81
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Bay City, MI - USA

Vette(s):
1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015


Joined: 9/29/2020
Posts: 24

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 (10/12)
 11/18/20 6:18pm
TTJR 81
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Bay City, MI - USA

Vette(s):
1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015


Joined: 9/29/2020
Posts: 24

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?

Re: Remove AIR on my 81 (11/12)
 11/18/20 9:38pm
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Duncanville, TX - USA

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


Joined: 11/8/2003
Posts: 19782

Only lt grn wire I see on the diagram in that area goes to the rear of the A/C compressor, for the heat switch, which your compressor does not have. Guess it is just a spare wire you do not need.



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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 (12/12)
 11/18/20 10:11pm
TTJR 81
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Bay City, MI - USA

Vette(s):
1981 white coupe, red interior, also had a 1971 , 1985, 2011 and 2015


Joined: 9/29/2020
Posts: 24

Good to know,  thought i messed something up !  lol... Thanks so much

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