Rough Running 1981 C3 Help!!!
Drifting
Joined: Apr 2006
Posts: 1,911
Likes: 2
From: gold coast queensland
im going to get roasted like i normally do when i say this because there is alo of die hard 81 computer lovers on this forum but ataris and commodore 64,s are not my thing and havent been for 25 years ( computers have come a long way since pacman and space invaders)....trade in your computer controlled dizzy and carb. Buy a msd dizzy and a nice lil road demon or speed demon carb , build that switch to take advantage of your loc-up converter and be cruising happily ever after.
when you do this your computer wiring harness comes out in one big slug. so much of it when you send it off to the recyclers you could almost pay for all this stuff.
when you do this your computer wiring harness comes out in one big slug. so much of it when you send it off to the recyclers you could almost pay for all this stuff.
Last edited by gingerbreadman1977; Nov 10, 2009 at 08:10 PM.
Drifting
Joined: Aug 2009
Posts: 1,635
Likes: 8
From: Enid Oklahoma
im going to get roasted like i normally do when i say this because there is alo of die hard 81 computer lovers on this forum but ataris and commodore 64,s are not my thing and havent been for 25 years ( computers have come a long way since pacman and space invaders)....trade in your computer controlled dizzy and carb. Buy a msd dizzy and a nice lil road demon or speed demon carb , build that switch to take advantage of your loc-up converter and be cruising happily ever after.
when you do this your computer wiring harness comes out in one big slug. so much of it when you send it off to the recyclers you could almost pay for all this stuff.
when you do this your computer wiring harness comes out in one big slug. so much of it when you send it off to the recyclers you could almost pay for all this stuff.
Drifting
Joined: Apr 2006
Posts: 1,911
Likes: 2
From: gold coast queensland
That is exactly what will happen to mine eventually, but I dont like the idea of needing the switch for the converter. I know the sensors are just basically gathering info based on resistance changes in the sensor, so...couldn't I just add a resistor on the wire for each sensor to make the computer happy and not throw codes, then swap the dizzy and the carb and the computer would still sense speed and gear or whatever it needs for the converter and it would still work as needed without using a switch? There would be other more complicated ways to accomplish it, but it just seems this way would be simple.
Thread Starter
Racer
Joined: Nov 2009
Posts: 289
Likes: 0
From: Franksville Wisconsin
im going to get roasted like i normally do when i say this because there is alo of die hard 81 computer lovers on this forum but ataris and commodore 64,s are not my thing and havent been for 25 years ( computers have come a long way since pacman and space invaders)....trade in your computer controlled dizzy and carb. Buy a msd dizzy and a nice lil road demon or speed demon carb , build that switch to take advantage of your loc-up converter and be cruising happily ever after.
when you do this your computer wiring harness comes out in one big slug. so much of it when you send it off to the recyclers you could almost pay for all this stuff.
when you do this your computer wiring harness comes out in one big slug. so much of it when you send it off to the recyclers you could almost pay for all this stuff.
with that stuff I should get it done.I've had many tell me to keep computer,but I hate to be dependant on a computer.I had a four speed 81 Vette a few years ago and it was decomputerized ans I liked it that way!I just wanted to know why it stopped running well before converting. Thanks!
Racer
Joined: Dec 2007
Posts: 341
Likes: 29
From: vancouver washington
im going to get roasted like i normally do when i say this because there is alo of die hard 81 computer lovers on this forum but ataris and commodore 64,s are not my thing and havent been for 25 years ( computers have come a long way since pacman and space invaders)....trade in your computer controlled dizzy and carb. Buy a msd dizzy and a nice lil road demon or speed demon carb , build that switch to take advantage of your loc-up converter and be cruising happily ever after.
when you do this your computer wiring harness comes out in one big slug. so much of it when you send it off to the recyclers you could almost pay for all this stuff.
when you do this your computer wiring harness comes out in one big slug. so much of it when you send it off to the recyclers you could almost pay for all this stuff.
Thread Starter
Racer
Joined: Nov 2009
Posts: 289
Likes: 0
From: Franksville Wisconsin
Easy answer: computer has nothing to do with the cruise control.
Harder answer: all the other questions.
Let's make sure we're on the same page for computer codes and my apologies up front if you already know this. When you jump the two terminals on one end of the computer connector under your ashtray (the one with a shorter divider between the terminals) you should hear the clicking from under the hood. In a few seconds, the "check engine" light should flash in series of regular flashes with pauses in between. Each series is two digits and repeats three times before going on to the next code.
Assuming that you are doing the above then you should be getting a 12 code and presumably others. That is unless you disconnected the battery to do some of the swaps. In that case, you should only get the 12 code. Realize too that this is a pretty primative computer system with a very limited number of sensors. It will only tell you one of a few issues and the rest you have to figure out on your own.
Harder answer: all the other questions.
Let's make sure we're on the same page for computer codes and my apologies up front if you already know this. When you jump the two terminals on one end of the computer connector under your ashtray (the one with a shorter divider between the terminals) you should hear the clicking from under the hood. In a few seconds, the "check engine" light should flash in series of regular flashes with pauses in between. Each series is two digits and repeats three times before going on to the next code.
Assuming that you are doing the above then you should be getting a 12 code and presumably others. That is unless you disconnected the battery to do some of the swaps. In that case, you should only get the 12 code. Realize too that this is a pretty primative computer system with a very limited number of sensors. It will only tell you one of a few issues and the rest you have to figure out on your own.
