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GM B-Body Forum, 77-79 Caprice/Impala Forum

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    Emissions Control

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    Kiwi Robin
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    Post  Kiwi Robin on Sat Dec 08, 2018 7:07 pm

    Hi Folks
    I live in New Zealand and I have a 1980 Chevy Caprice Classic 305 4dr sedan which I want to rip out all the Emission control junk, I would be grateful for any info to help me make this easy as possible, looking forward to any replies.
    Cheers..................Kiwi Robin.12.09.2018.
    Kit1078
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    Post  Kit1078 on Sat Dec 15, 2018 5:21 pm

    If this is the same 305 V8 that came in the American version, all you should need to get rid of most of the emissions equipment is a non-computer distributor and carburetor. I don't know what speed shop or parts supplier you have available?
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    Kiwi Robin
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    Post  Kiwi Robin on Thu Dec 27, 2018 9:37 pm

    My caprice was imported into New Zealand in 1987, I can get most parts from Rockauto shipped to NZ at a reasonable cost
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    Post  Kit1078 on Sat Dec 29, 2018 1:44 pm

    Alright. So, the first thing you want to figure out is whether or not your car has a computer controlled carburetor. I think 1980 is the changeover year from non computer to computer controlled. (Yes, they actually had a computer controlled carburetor, as opposed to early throttle body injection. They're complicated, fickle, and, frankly, a pain in the...)

    If you don't have a computer controlled carburetor, it's just a matter of weeding out the unnecessary vacuum controls and blocking off the EGR valve. If you do have a computer controlled carburetor, you'll need to get ahold of a non-computer controlled carburetor AND distributor.

    The following link is an example of the computer controlled carburetor commonly used:
    https://www.i-5automotive.com/product/4-barrel-rochester-quadrajet-e4mc/

    The only real difference externally from the normal carburetor is the addition of two plugs, one near the accelerator pump on the front of the carburetor, usually a 3 prong plug, and one on top of the carburetor, usually a 2 prong plug (shown in blue on the pictures)

    I do not know of any way to convert that to a non-computer controlled carburetor.

    I did this same conversion on my '85 olds wagon about 10 years ago. It's not terrible, but you need to have a timing light around if you're going to remove the distributor. Also, a vacuum gauge helps when tuning (nothing fancy, so long as it reads to about 25 inches/1 bar vacuum).
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    Kiwi Robin
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    Post  Kiwi Robin on Wed Jan 02, 2019 4:18 pm

    01.03.2019 09:50:20. AM NZ Time.

    Kit1078

    I have done a bit of research on my carburetor (17080204 M4ME) it is a non computer unit with a heated choke coil as per 'The Carburetor Dr', so on that note it should be pretty straight forward for the removal of the Emission Control stuff, I am sure Mr 'Google' will come into play somewhere.

    Thanks for your input it is most appreciated, I will let you know how I get on with this in the future.

    Cheers.....................Kiwi Robin.

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