I own an '86 Firebird with a carburated 305 and a 700R4. I'm just wondering what kind of computer it has and what the computer does. Thanks for your time!

John

 

it's not like a pc, it's a car computer. It's not like you can hook a moniter up to it and a keyboard...it's different... I don't really know what to tell you.

It regulates different things in different cars. If you have fuel injection,it controls the system, and emmisions stuff. Carb computers regulate the carb, somehow.

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'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei
'95 3.23 rearend
hotchkis rear suspension

 

Whatever you do, dont ask on the prom board they wont tell you.

Its a microcontroller, not a normal computer as you would see on a desk or something. The only way to tell it what to do is a programmed chip (or more correctly prom or eprom). I am not positive, but I would have to guess the carbed ones are based on the same processor as the FI cars, which is based on a Motorola processor. The computer controls the fuel via a mixture control solenoid and the timing thru the ecm, and it has various sensors to get the information it needs. If you are considering disconnecting it (a wild assumption on my part), you will need a new carb and distributor.

 

go for the disconnect man, it's worth it. Hey, you may lose some gas milage, but you'll gain some power.computer controlled carbs is a dumb idea. EFI is good for computers, but not carbs. Just my opinion.

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'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei
'95 3.23 rearend
hotchkis rear suspension

 

J,

You have this kind, hopefully without the burned components:



Your ECM controls idle mixture, some power enrichment, ignition timing, electric fan, torque converter lockup, EVAP purge, and AIR diverter operation. Disconnecting it could be quite a bit of work, especially if you have an emissions inspection.

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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

Would it be possible with my computer, to then drop in a 383 in replace of the 305? As long as I replace the prom? I plan on having a 383 with an Edelbrock performer RPM package, heads, cam, carb, intake...

 

Ask on the carb board, but those computers are easily fooled. I dont think you will run into any problems that cant be corrected.