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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: mwood150 on April 15, 2009, 09:04:06 am

Title: 85 Chevy 1/2 ton 2wd ECM
Post by: mwood150 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?

Title: Re: 85 Chevy 1/2 ton 2wd ECM
Post by: Captkaos on April 15, 2009, 11:31:50 am

The ECM controls the primary mixture of the CCC Quadrajet, it also controls timing.

Title: Re: 85 Chevy 1/2 ton 2wd ECM
Post by: VileZambonie on April 15, 2009, 05:30:10 pm

It controls EGR, TCC, EVAP purge, mixture contol, a.i.r. diverter and spark retard.

Title: Re: 85 Chevy 1/2 ton 2wd ECM
Post by: mwood150 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

Title: Re: 85 Chevy 1/2 ton 2wd ECM
Post by: mwood150 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 :)

Title: Re: 85 Chevy 1/2 ton 2wd ECM
Post by: VileZambonie on April 16, 2009, 11:53:31 am

If your goal is emissions compliance then leave it be.

Title: Re: 85 Chevy 1/2 ton 2wd ECM
Post by: Captkaos 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.