[johnrezz]

I got as far as to get my carb bolted on but I had a few questions that will help me proceed tomorrow....
This is a 89 YJ with an engine out of a 84 CJ 4.2L 258CI

I am installing the redline 32/36 carb with the stock air cleaner since I live at altitude and get alot of driving snow(carb icing)

I am also installing a CRT HEI distributor kit
questions:

1. Do I need to reinstall the PCV Valve with this setup?

2. Since this is electric choke do I need to re-install the choke heat tube from the exhaust manifold to the bottom of the intake???? or should I plug both holes. The exhaust manifold came with a plug in it already but I have to come up with one for the intake.

3.do I need to hook up the EGR valve???
Basically I am confused on what I need and what I dont. The guy who had the jeep before me removed almost all of the emissions, the pulse air is plugged off, there was no vacume lines installed on the manifold and I think the computer is gone,

So what do I need to do from here, picture as it sits right now:

[tippmann243]

Originally Posted by johnrezz

1. Do I need to reinstall the PCV Valve with this setup?

2. Since this is electric choke do I need to re-install the choke heat tube from the exhaust manifold to the bottom of the intake???? or should I plug both holes. The exhaust manifold came with a plug in it already but I have to come up with one for the intake.

3.do I need to hook up the EGR valve???
Basically I am confused on what I need and what I dont. The guy who had the jeep before me removed almost all of the emissions, the pulse air is plugged off, there was no vacume lines installed on the manifold and I think the computer is gone,

1. yes you need to hook the pcv valve up. without the pcv valve hooked up pressure can build in the crank case and in a worst case the seals in the motor (rear main, front main, valve cover ect.) can blow out.

2. if your gonna reinstall the stock air cleaner you might as well install the stove pipe, as long as vacuum door works properly. the stove pipe helps the einge heat up faster by using warm air from around the exhaust amnifold. the idea was to get the eninge to opperating temperature faster to reduce emission.

3. yes you want to keep egr this is why.


-EXHAUST GAS:
Dont think of the recirculated exhaust gas as unburnt fuel. Instead, think of it as intake air with little to no oxygen. The lack of oxygen causes the exhaust gas to be inert; as in, causing no reaction. An inert gas in the cylinder simply takes up space that intake air(oxygen) would otherwise fill.

-LOWER TEMPS AND LOWER NOx AS A RESULT
The more lean you run an air fuel mixture, the hotter the combustion temps. The more rich, the cooler. The connection to emissions is that more ppm(parts per million) of NOx(oxides of nitrogen) are created the hotter the combustion temperature. Oxides of Nitrogen are dangerous because, as the "x" specifies(NOx), the number of oxygen molecules can vary. This means that the NOx molecules can bond with a number of elements and create things that attribute greatly to both smog and the so called "green house gasses".

-ALL TOGETHER
Essentialy, when your EGR opens it is reducing the displacement of the cylinder by taking up room that could otherwise be occupied by oxygen, while still maintaining your compression ratio. EGR activation usualy happens when cruising and generaly causes the following: lower combustion pressures, slightly more rich AFR(this is on purpose in order to create the cooling effect), lower NOx, slightly better fuel mileage and lots of headaches if it malfunctions.

As for being the same as useing a cooler t-stat. Not realy and here's why. The cooler t-stat lowers the coolant temp, thereby effecting the temp of the cylinder wall from without. This does not effect the actual temperature produced at the moment of combustion. By cooling the cylinder walls you can gain a slightly more dense Air/Fuel charge and more power; but the heat released by the combustion is the same. The EGR directly effects AFR by controling, not the amount of air flow but the amount of Oxygen in the cylinder at the point of combustion.

[johnrezz]

I cannot get the egr tube off of my old exhaust manifold. I will check napa tomorrow but I dont know if that is a part they would carry in stock. I have the port on the exhaust manifold plugged but I do not have anything to plug the hole under the carb on the intake. will this create a leak? is it ok to try and set up the carb with that open???

also do you connect the pcv valve vacume line to the valve on the on the spacer below the carb???? right now I have it plugged

[johnrezz]

so I just noticed that there is no EGR valve on the intake I am using, meaning that who ever had the jeep before must have reomoved it. I do have an old egr valve on the donor intake, I will swap that one in and give it a shot. If I am correct I need to run a vacume line from the CTO valve to the EGR as well as hook up the old EGR tube.

Again as far as the PCV valve system goes, am I correct to hook it to the port on the spacer below the carb???
see picture, I am talking about the brass fitting coming off of the front:

[tippmann243]

Originally Posted by johnrezz

so I just noticed that there is no EGR valve on the intake I am using, meaning that who ever had the jeep before must have reomoved it. I do have an old egr valve on the donor intake, I will swap that one in and give it a shot. If I am correct I need to run a vacume line from the CTO valve to the EGR as well as hook up the old EGR tube.

Again as far as the PCV valve system goes, am I correct to hook it to the port on the spacer below the carb???
see picture, I am talking about the brass fitting coming off of the front:

that is correct as far as the pcv valve goes.

[Burnerman]

Yes you need to hook up ported vacuum to the CTO. Best bet is to read this site and you can see what vacuum line goes where, how the air doors operate and why you should tun an EGR valve. Dales Help link

[johnrezz]

Ok, I put the EGR valve on but it looks like I am going to have to go through the dealer for the EGR tube.....

I guess I will just plug it for now

[Burnerman]

I got my new tube from the dealer..