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Author Topic: 85 Chevy 1/2 ton 2wd ECM  (Read 5314 times)

Offline mwood150

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85 Chevy 1/2 ton 2wd ECM
« on: April 15, 2009, 09:04:06 am »
My truck has an ECM in the glovebox, and a carbeurated 350 motor.  So my question is, what is the extent of what this computer controlls if there is no fuel injection?  Where can I find more information on this setup?
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Offline Captkaos

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Re: 85 Chevy 1/2 ton 2wd ECM
« Reply #1 on: April 15, 2009, 11:31:50 am »
The ECM controls the primary mixture of the CCC Quadrajet, it also controls timing.
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Offline VileZambonie

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Re: 85 Chevy 1/2 ton 2wd ECM
« Reply #2 on: April 15, 2009, 05:30:10 pm »
It controls EGR, TCC, EVAP purge, mixture contol, a.i.r. diverter and spark retard.
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Offline mwood150

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Re: 85 Chevy 1/2 ton 2wd ECM
« Reply #3 on: April 16, 2009, 08:29:04 am »
Wow.. thanks for that info, that definitely helped.  I looked up CCC info on google and got a good overview of its purpose.  It looks to me like this systems employs a lot of sensors and logic for the simple purpose of enriching or leaning the mixture a little.   My feeling is it may make more sense for me to just eliminate this and go to a standard quad jet carb.  I would still keep computer for other things, just not fuel management.   Would you all agree, or have you found this system is worth its extra complexity?

Thanks,
Mark
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Offline mwood150

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Re: 85 Chevy 1/2 ton 2wd ECM
« Reply #4 on: April 16, 2009, 09:04:15 am »
Hey everyone.. Ignore that last comment.  I have just been looking around and found out what a touchy subject this is.  I have had my fill of opinions on if it should stay or go!  I'll just keep my decision to myself :)
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Offline VileZambonie

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Re: 85 Chevy 1/2 ton 2wd ECM
« Reply #5 on: April 16, 2009, 11:53:31 am »
If your goal is emissions compliance then leave it be.
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Offline Captkaos

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Re: 85 Chevy 1/2 ton 2wd ECM
« Reply #6 on: April 16, 2009, 12:45:28 pm »
If you have to pass emissions, you have to keep it, if not, well that is your choice.
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