De-Smogging an early 22R
 

Well, I have been threatening to post this for a while, and so here it goes.

I recently completed a complete de-smog on my 22R. In the process of doing this, I was amazed by the wealth of info on the carburetion for these trucks. I was also completely amazed by the lack of information on how to effect a de-smog. I know it is frequently done, and several companies (such as LCE) make block plates for smog components, but I couldn't seem to find a complete description of the best way to make this happen. So, after the fact, I will document here the steps that I took to make this work, hopefully this can be of some benefit to others in the future. Please excuse the lack of work-in-progress pics, my camera was unavailable until after I had completed the work.

With no further ado, here's the start.

The Process
 

So there are several parts to this puzzle:

1)Removal of the EGR valve
2)Removal of the PAIR valve
3)Removal of the Air Injection Manifold (the feed tube from the exhaust manifold to the PAIR valve)
4)Plugging the Air Injection ports on the exhaust manifold
5)Vacuum / Vacuum Switch removal
6)Vacuum re-installation

We will address these one by one.

cool I will be watching, post before and after engine bay pics, maybe use ms paint to lable and circle stuff??

Parts you will need:

Materials:
-EGR Block Plates - I bought mine here:
-2x 7/16 - 14 Set screws or bolts, less than 1/2" long.

Tools:

-Basic hand tools
-7/16 - 14 Tap

No before shots, alas, my camera was with the wife at the beginning of the project. I will try to fill in as needed with shots shamelessly stolen from other people's rigs :hillbill:

so does this strip it down to just a carb, with no vacuum hoses?

Before I really start, here's a nod to all the awesome posts and sites that I sourced this info from, listed below. Thanks a bunch for "paying it forward", this has been an enormous help.

22R Carb info. Very detailed, lots of diagrams.
http://www.bluebassdesign.com/boonin/carb_faq/

Pirate thread on Carb Tuning:
http://www.pirate4x4.com/forum/showthread.php?t=249626

LC Engineering, THE 22R builders. Quick responses to questions, excellent help and info, and good prices.
http://www.lceperformance.com/

Download your FSM here! Thanks TTORA!
http://www.ncttora.com/fsm/

Vacuum - Smog info
https://www.yotatech.com/forums/f115...-84-22r-95780/

Canada Vacuum Diagram
https://www.yotatech.com/forums/f114...agetti-156959/


Thanks again guys, you rock!

Very few hoses, and instructions on how to choose what is important to you as far as what vacuum lines you keep, and what you eliminate.

Also for the record, I feel compelled to state:

This thread is in no way to disseminate information for illegal use. If your vehicle is an on-highway vehicle, or if off-highway vehicles have smog restrictions in your area, DON'T DO THIS. This thread is for informational purposes only, for uses that are not regulated by smog restrictions.

First, you need to remove the EGR valve, the EGR vacuum modulator, and all attached vacuum lines. Remove the vacuum lines, and then remove the nut circled in the diagram below.

Attachment 185706

You can now remove the EGR tube that you previously disconnected from the EGR valve. Here is a pic of the tube, shamelessly ripped off from flyingbrass:

Then, remove the EGR valve from where it bolts up to the head. Here is a shot of my removed EGR, to give you an idea of the location and bolt pattern.

Attachment 185707

Now, you should be able to disconnect the EGR and remove it.

Subscribed!
Sweet thread - but now I can't sleep, keep the pics coming!

Next, removal of the PAIR valve or Reed valve. This bolts to the engine, just below the EGR, underneath the intake manifold. Due to the location, it is damn near impossible to get a pic with it installed. There are only two bolts holding this to the block, but finding them will be difficult.

The PAIR valve, in all its fury. The rear hose connects to the Air Injection Manifold that is attached to your exhaust manifold. The front hoses normally would go to a smog pump, I believe. Mine did not have one from the beginning, so they just had rags stuffed down the hoses. Obviously, it was doing a lot for me...

Attachment 185708

Here are two pics that show the mounting holes. The first shows where they are located, but you can't see the holes themselves that well. The second shot shows the side of the PAIR valve that is usually flush against the block, the mounting holes are clearly visible.

Attachment 185709


Attachment 185710

More posting tomorrow, I am out of steam now =)

You found it! Cool, I was gonna post a link for you when I got a bit further along...

Oh the suspense is killing me now:good:

HEY want a pic of the reed valve installed on the engine?
cuz i can get you one tomorrow.
I have a complete 22r pulled out of an 81', and sitting in a cj2a frame without a body on.
So if you need extra pics just tell me

SUBSCRIBED!!!
this is awesome, i was wonering about taking off the EGR because mines drawing too much vacuum through a leek, now i just need to make some block off plates. no smog regs wher i live, thanks pumpkinyota

Man would that be great! That has to be the worst visibility of any place on that block. When I pulled mine, I ended up pulling the intake, and cussing a lot when I saw that there wee only 2 12mm bolts holding it on the block... :bang:

Gotta hate that. Good work! There's a real lack of good write-ups on stuff people are always asking questions about.

Attachment 185698
Attachment 185699
Attachment 185700
Attachment 185701

Here ya go, i'm helping you help me, lol.

Awesome, thanks!