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Old Apr 2nd, 17, 07:32 AM   #1 (permalink)
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Cool 81 Carb question Computer

I just picked up a 81 that appears to be the only year that has a computer running the carb etc what can I do to get RID of it

If I replace the carb and intake with after market can I by pass the computer and not have any issues?
thanks

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Old Apr 2nd, 17, 09:35 AM   #2 (permalink)
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Re: 81 Carb question Computer

no need to replace the intake.
Replace carb and distributor.
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Old Apr 2nd, 17, 11:49 AM   #3 (permalink)
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Re: 81 Carb question Computer

Thanks so the carb and Dist are controlled by the computer, ? change those and good to go..?

it is running REAL RICh black smoke even
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Old Apr 5th, 17, 08:27 AM   #4 (permalink)
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Re: 81 Carb question Computer

Oh the good ol days. I use to own a 81 Z28, and had the same idea back then. But....it wasn't as easy one would think.

I replaced the carb, intake, distributor.....the whole nine yards, and it ran worse.

Remember, this was the first year for GM's infamous CCC system, which controls everything from the engine management to transmission control. If anything was missing from the CCC (info / data), nothing would work, and you get put into the "limp-home" mode, with the Check Engine light. Basically it runs like crap, and there's nothing you can do.

What it all boil's to is...either get rid of the entire system and transmission and revert back to a non CCC configuration - or put it back to stock, which is what I had to do. But...

In my case, it was a simple adjustment near the electric solenoid on the top half of the carb. You'll find a small round plug which you'll need a small drill bit to open up....not too far, just enough to break through the cap. Take a long screw, and screw it in and pull out with the help of pliers.

Start the car and adjust the carb (actually the solenoid) while its running you'll tell when it's right.
After I did that, the car ran great. In addition, there are a couple of wires on the front connector of that solenoid that can be monitored by a multimeter to make sure the monitor voltage is right on spec.

Either way, wanted to throw that out to you just in case. Hope you get it running right.

Btw, get the GM shop manual....it proved invaluable troubleshooting CCM issues.
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Old Apr 5th, 17, 11:32 AM   #5 (permalink)
 
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Re: 81 Carb question Computer

The 1981 CCC system controls the air/fuel mixture ONLY. See the article by doing a search on "GM Introduces CCC - GM Heritage Center" and look at the PDF file that shows up in the results. (I can't post the link)

In 1981 it did not control the transmission. If the distributor has a vacuum advance on it, it is not controlled by the computer.

Eventually the system did control timing when it evolved to an ECM (Engine Control Module) system, and the transmission was controlled later by the PCM (Powertrain Control Module) systems. Until OBD 1 systems were introduced the car's computer only controlled torque converter lock-up for overdrive transmissions and some Turbo 350s that had lock-up torque converters.
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Old Apr 5th, 17, 03:42 PM   #6 (permalink)
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Re: 81 Carb question Computer

Ok, I'll go with that but the auto trans I had an overdrive that was controlled by some kind of computer. It wouldn't go into OD until it reached a certain temp.

I was told by a GM tech that to get rid of the CCC entirely I had to replace the trans with an ordinary, non computer controlled trans- something about a converter solenoid that engaged the O/D ....but that was years ago....so its a bit sketchy. I remember that the whole CCC was a major headache when trying to increase horsepower with aftermarket stuff. I guess things weren't in place like it is now.....

And to correct myself, I adjusted the throttle position sensor in the carb.

Should have bought an 80 Z28!!!
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Old Apr 5th, 17, 06:06 PM   #7 (permalink)
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Re: 81 Carb question Computer

The only function on the trans that won't work as intended is the lock up torque converter.

Many of the guys on this board put such trannys in a first gen and EITHER just live without the tc locking up (not a big deal if you don't drive on the highway much) or they wire in a separate switch to lock it up when on the highway. If you do that, you need some means of having the tc unlock when you get below a certain speed. There are several approaches to the fix. Do a search on O\D transmission retrofits.

Trans will shift fine and work fine without lock up converter. You will see about 1 = 2 mpg improvement in pure highway driving. No difference around town.
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