Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

What does the computer control???

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Old Oct 15, 2004 | 08:17 AM
  #1  
84tamax's Avatar
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From: montreal
Car: 1984 trans am
Engine: lg4
Transmission: 700r4
What does the computer control???

i unhooked the computer and nothing happens. What does it do?
i also unplugged all the emission crap. Is there anything that i must leave connected? so far i have capped every vacuum plug on the carp
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Old Oct 16, 2004 | 06:50 AM
  #2  
hookedon3gen's Avatar
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From: Delaware
Car: 88 camaro
Engine: 383 carbed
Transmission: 700r4
Well, I just wired in a painless harness and it hooks to the ecm. ECM (computer), if you have a tbi or a tpi, it controls your fuel and air mixture, torque convertor, vss, egr , throtle, ignition, o2 sensor, oil sensor, temp. sensor and emissions can be attached. I may not have everything down but thats the most part. If you have a carburator
vs fuel injection, the Ecm plays no part at all. It mainly controls engine funtions if I am not mistaken..
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Old Oct 16, 2004 | 01:51 PM
  #3  
tom3's Avatar
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From: So. Ohio
Car: 88 Camaro
Engine: L98 350
Transmission: 700r4
ECM controls fuel mixture, timing, idle speed. Car will run without it but sure drink some gas. Good system when right, I'd have left it alone.
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Old Oct 16, 2004 | 03:05 PM
  #4  
deadbird's Avatar
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From: So.west IN
Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
You may as well get an aftermarket carb & a old style vacuum advance HEI distributor now. The ECM used to control your timing advance. The Q-jet, w/o ECM IIRC (may be thinking of Ferd's though), will default to pig-rich idle mixture and run considerably rich through the rest of the rpm band.

Junkyard shopping sometimes yields good results on the cheap.
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Old Oct 16, 2004 | 06:55 PM
  #5  
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naf
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From: Lexington, SC
Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
If you have the ccc-qjet (some canadian models did not) the comp controls primary fuel/air, ignition advance and torque converter lockup. If you unplugged it and didn't notice a difference, it must not have been operating properly (what was your mileage?).

On the vacuum lines, hope you didn't disconnect the pcv (to valve cover) and there's no reason to disconnect the evap canister or the egr valve. The EFE (vac valve in pass side exhaust-if stock) can also help with cold weather warm up.

Do a search here for good info. You can also check out montecarloss.com for some good stuff on the ccc-qjet in their tech section. Find out what you've got, learn how it works, then no worries.
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