Pre 84 Trucks 1st gen pickups

Emissions Switch

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Old Feb 24, 2018 | 10:32 PM
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WolfMann's Avatar
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From: Hayfork, California
Emissions Switch

Switching from CA to Canada emissions on 83 pickup, 22r. Here's how it looked when I started:

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Old Feb 24, 2018 | 10:45 PM
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Here's what we're switching too/how it's looking now, I got the intake manifold off and cleaned up, but didn't get pictures before sundown. I'll take some more tomorrow when I'm putting it back together.
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Old Feb 24, 2018 | 11:18 PM
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These are the block off plates I put together for the egr ports and exhaust manifold, traced out the gaskets on scrap sheet metal, punched and drilled holes, then cut out and touched up with angle grinder. I think they came out alright. You can see on top of exhaust manifold the recirculation vents, I cut them flush with top of manifold, have to drill out broken bolt on left side but it'll turn out alright.

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Old Feb 25, 2018 | 05:35 PM
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Hey guys got more done today:
Here's some photos of the head and block after removing the intake and cleaning it up. These are the plates I put on top of exhaust manifold. Below that is the box of parts removed. It did feel good to clean out the engine bay.
Before
After

So I got the broken bolt out, but lacked hardware for getting the new one in...this wire should hold until next trip to town, probably forever.


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Old Feb 25, 2018 | 05:57 PM
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This is the intake manifold bolted back on with a new gasket, I've left the vacuum switches in, just disconnected, until I can grab bolts to replace. Also note the egr plates in place and secured, they fit nicely. I left the sensor in place on the bottom of intake, I don't plan on removing it unless someone could convince me of a good reason. Below that is a shot of the carb back in place, and then you can see the finished product. I think it looks pretty good.
Cleaned up and buttoned back on
Aisan carb with the fixings...
And now vacuum lines

Red!


Last edited by WolfMann; Feb 25, 2018 at 06:11 PM.
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Old Feb 25, 2018 | 07:46 PM
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So I got it started and timed it since the last post. What I was most impressed with was how well it idles now. Drops down to curb idle and just purrs steady. There's a few things to fine tune/plug up but for the most part I'm happy with it. I'll update again with pictures once everything's a little more finalized.
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Old Feb 26, 2018 | 11:26 AM
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From: Crawlorado
It does look much cleaner. What kind of emissions does this setup reduce with the EGR and secondary air injection systems removed?
Is it capable of passing a visual inspection?

Where I'm located along the northern front range of Colorado I have to pass a yearly visual inspection of my emissions system and an idle speed test to keep my truck registered.
Not easy to do with a Weber 38 and headers but I have managed.
My EGR system is blocked off but isn't necessary to pass the visual inspection. I just have to have a complete secondary air injection system bolted up and then re-tune the carb and timing and it will pass.
I make it sound easy but it was a lot of trial and error until I figured out what worked in my garage. It has definitely taught me a great deal about tuning Webers!

I'm genuinely interested in how your inspection test goes...which I'm assuming you have to take at some point.

Last edited by Punjab; Feb 26, 2018 at 11:27 AM.
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Old Feb 26, 2018 | 04:13 PM
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It still has a charcoal canister and a cat. converter, I've read somewhere about bolting the egr over the plates, I imagine that would get it through visual. I live in a county that does not require smog, so I'm not sure how it would do. I imagine with some clever tuning you might get it through.
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