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Topic: Removing carb and distributor on 81

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Removing carb and distributor on 81 (1/7)
 7/21/21 11:39am
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: 28

I have had issues with my 81 that has stock setup for carb and distributor and computer. Long story short have tried to figure out what is causing my CEL , have monitor and used the dash lights flashing codes. It gives me every one of them, starting at 12 and going through them all to 55. Car is running poorly, rough idle and does not want to shift smoothly. I am ready to switch out the carb to a earlier q jet and get an new HEI distributor. I want the car to not have any controls with the CCC. Any suggestions on where to get the carb and dizzy? See Summit and Jegs have them , just want to get a quality rebuild that needs minimal running. I appreciated the input! Thanks

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Re: Removing carb and distributor on 81 (2/7)
 7/22/21 12:48pm
Adams' AppleLifetime Member
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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: 19842

Certainly sounds like the ECM or the EPROM has taken a dump, assuming all the power & ground circuits are sound.

Any carb you get from anywhere will need some tinkering/fine tuning to get set up for your vehicle, but the HEI set-up should be a plug & play deal. Can't recommend any specific place to get either....buyer's choice on those things. I want to mention that the trans is NOT controlled by the ECM other than the lock up torque converter clutch(TCC).....the shifting is all mechanically controlled. If the trans is shifting funky, it is due to the engine running like crap. That being said, eliminating the ECM will also eliminate the lock-up function. There are ways to make the TCC work without the ECM, both mechanically and/or electrically....depends on if you even want it to work or not. The measly .02-.05 mpg gain from the lock-up working on a 350 trans is pretty much useless these days.



|UPDATED|7/22/2021 9:48:32 AM (AZT)|/UPDATED|


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Joel Adams
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Re: Removing carb and distributor on 81 (3/7)
 7/21/21 5:12pm
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: 28

Pretty much figured the computer has to be on its way out, hard to believe all codes would act up at once! Anything special that has to be done for the disconnect of computer, other than simply un plugging it? Once I have the new, old carb and distributor on will the CEL still come on?  Thanks for the input and help !  

Re: Removing carb and distributor on 81 (4/7)
 7/21/21 9:08pm
Adams' AppleLifetime Member
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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: 19842

Disconnecting the ECM should eliminate the CEL, afaik.



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Joel Adams
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Re: Removing carb and distributor on 81 (5/7)
 7/22/21 12:17pm
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: 28

Columbo here again, lol....one more question, I assume that the EGR and vacuum solenoid can be removed as well once the CCC is gone? Would like to continue cleaning up the engine compartment! Thanks 

Re: Removing carb and distributor on 81 (6/7)
 7/22/21 12:53pm
Adams' AppleLifetime Member
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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: 19842

Remove away! Be sure to use a block-off plate for the EGR, and plug all vacuum lines related to it....obviously.



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Joel Adams
C3VR Lifetime Member #56    

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(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: Removing carb and distributor on 81 (7/7)
 7/26/21 5:50pm
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: 28

Also wondering about the EFE system and its valve actuator on passenger side. I am removing the EGR and want to disconnect that as well. Without removing the actuator is there a way to know when its open and then remove vacuum line? Does it require vacuum to keep open?  Thanks! 

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