1981 sat a for a year or so
08-01-2016, 03:00 PM
#1
Cruising
Thread Starter
1981 sat a for a year or so
I picked this car up, filled with premium gas when I stepped on it the check engine light came on. When I let off the light goes out. The check engine light only comes on when I get on the gas hard.
08-02-2016, 05:25 PM
#2
Race Director
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I suspect the computer is either getting a timing anomaly or a bad air/fuel mixture reading when accelerating. You indicate the car sat for a year. Did you change plugs/wires and are you running fresh fuel?
Last edited by Tally Ho; 08-02-2016 at 05:26 PM.
08-02-2016, 07:28 PM
#3
Race Director
I agree...with the 'CHECK ENGINE ' light being on..there is a trouble code stored that you can read and see what it is...and I would bet that it has to do with air/fuel mixture.
DUB
DUB
09-09-2016, 07:35 AM
#4
Cruising
Thread Starter
I changed the computer and had the carb rebuilt. sorry about getting back so late, still getting used to how this hole forum thing works. but really seems helpful, and thanks for the input, didn't think about the plugs and wires.
09-09-2016, 07:44 AM
#5
Cruising
Thread Starter
you are right, about 25 codes, ended up just changing out the computer. rebuilding the carb helped, getting there. what octane you guys recommend? just filled last night and checked mpg and with 93 I got 14 mpg. Not sure but doesn't seem to good to me. may need a trip back to the "Vett" doctor.
09-09-2016, 07:15 PM
#6
Drifting
I run mine with 89 just fine. 14 mpg is pretty good considering it is a car with a 4BBL carb and not fuel injected. you cannot compare these cars to modern day cars.
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jep81vett (09-10-2016)
09-10-2016, 11:07 AM
#8
Race Director
you are right, about 25 codes, ended up just changing out the computer. rebuilding the carb helped, getting there. what octane you guys recommend? just filled last night and checked mpg and with 93 I got 14 mpg. Not sure but doesn't seem to good to me. may need a trip back to the "Vett" doctor.
Post the codes that you're getting now. The computer system on these work very well as long as everything is functioning properly.
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jep81vett (09-11-2016)
09-11-2016, 07:26 AM
#10
Cruising
Thread Starter
The computer was changed out so I cant post the codes, The engine light no longer comes on. Good to hear about the fuel, I know nothing about these engines but I'm learning. It's all stock, hard to even see the plug wires, plastic cover over the distributer cap. I was wanting to look at the benefit's of getting more air in sometime, and getting rid of those two big snorkels coming off the air cleaner! I had the carb rebuilt and added some flow masters. Thanks for the help, I'm getting better little by little.
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jep81vett (09-13-2016)
