96-01 EGR Limiter Install

[Joker2040]

Ok guys.... I took one of those EGR Limiters out of the batch I made and convinced a buddy to let me install it on his Bravada. Below are a few pictures of the install. I'll keep it very brief because there really isn't much to the install.

Also remember that before you install this limiter you need to paint it with some high temp paint to prevent rusting.

http://s10planet.com/forum/Mike/1.JPG

Above: This is the painted EGR Limiter getting ready to be installed.

http://s10planet.com/forum/Mike/7.JPG

Above: You can see 2 nuts (10mm) on the throttle body and the 2 bolts (should be 12mm but I used a 13) in the thermostat that need to be removed. Also you will want to disconnect the plug on top of the AC. In the picture it is located right behind the belt with a blue ring around it.

http://s10planet.com/forum/Mike/8.JPG

Above: Closer view of the previous picture.

http://s10planet.com/forum/Mike/2.JPG

Above: I'm pointing to the EGR fitting that needs to be loosened. I also went in from the side my hand is on with vice grips and used them to unscrew the EGR fitting. I don't suggest using vice grips unless you are VERY careful because you can scar up the metal very easily.





http://s10planet.com/forum/Mike/5.JPG

Above: The EGR Limiter (BLACK) is screwed inline. I put the EGR Limiter into the intake manifold first then screwed the EGR line into it.

http://s10planet.com/forum/Mike/6.JPG

Above: Another picture of the EGR Limiter in place.

[Joker2040]

Now Guys This Isn't A Step By Step Guide. I Just Threw This Together To Give You An Idea Of What Needs To Be Done. If You Have Any Doubts Please Post Up And Get Your Facts Straight Before Jumping Into This Project.

[00S104.3]

What purpose does this serve? Just curious.

[mrazor]

I will let you all know what comes of it, so far I have noticed some more response on throttle.

[Joker2040]

Below is a direct quote from Sparky2263:

"Here's what GM says;



General Information

Exhaust Gas Recirculation (EGR) System Descriptionhttp://motoralldata.com/alldata/MOTOR%7EV31464278%7EC37357%7ER0%7EOB0%7EP3R0H%7EN/0/77993956/78154671/92727709/92727711/34853741/34857029/34857699/34858149/34849881/85695907/86454146/98877536
The control module (http://motoralldata.com/alldata/MOTOR%7EV31464278%7EC37357%7ER0%7EOD%7EN/0/77993956/78154671/92727709/92727711/34853741/34857029/56218937/57612703) command exclusively operates the linear exhaust gas recirculation (EGR) valve (1). The control module monitors the following various engine parameters:

The Throttle Position (TP) sensor

The Manifold Absolute Pressure (MAP (http://motoralldata.com/alldata/MOTOR%7EV31464278%7EC37357%7ER0%7EOD%7EN/0/77993956/78154671/92727709/92727711/34853741/34857029/34857030/34857526))
The Engine Coolant Temperature (ECT) sensor
The EGR pintle position sensor
Output messages are then sent to the EGR system indicating the proper amount of exhaust gas (2) recirculation, with intake air (3), necessary in order to lower the combustion temperatures. This electronic metering of exhaust gas is 10 times faster than the vacuum-operated models as well as an improved diagnostic capabilities.

Positioned at the top of the linear EGR assembly are 5 terminal.

http://motoralldata.com/alldata/MOTOR%7EV31464278%7EC37357%7ER0%7EOB0%7EP3R0H%7EN/0/77993956/78154671/92727709/92727711/34853741/34857029/34857699/34858149/34849881/85695907/86454146/86454151
A pulse width modulated signal from the VCM enters the valve through an electrical connector which energizes the solenoid, or bobbin and coil, assembly (3). This causes the armature assembly (4), (6) to be pulled upward, lifting the pintle (5) a variable amount off the base.

The exhaust gas then flows from the exhaust manifold through the orifice into the intake manifold. The pintle position sensor (2) reads the height of the pintle, and the control module (http://motoralldata.com/alldata/MOTOR%7EV31464278%7EC37357%7ER0%7EOD%7EN/0/77993956/78154671/92727709/92727711/34853741/34857029/56218937/57612703) closes the loop on a desired position versus the actual position read. This changes the pulse width modulated command to the solenoid accordingly, until the actual pintle position equals the desired pintle position.

The linear EGR valve is unique in that the control module (http://motoralldata.com/alldata/MOTOR%7EV31464278%7EC37357%7ER0%7EOD%7EN/0/77993956/78154671/92727709/92727711/34853741/34857029/56218937/57612703) continuously monitors the pintle position. The control module adjusts the pintle position in order to obtain accurate flow, making linear EGR a Closed Loop system.

When the solenoid is de-energized, or the control module (http://motoralldata.com/alldata/MOTOR%7EV31464278%7EC37357%7ER0%7EOD%7EN/0/77993956/78154671/92727709/92727711/34853741/34857029/56218937/57612703) breaks the circuit, the pintle seals against the orifice, blocking the exhaust flow to the intake manifold.

Purpose

The Exhaust Gas Recirculation (EGR) system lowers the oxides of nitrogen (NOx) emission levels created by the high combustion temperatures.

Operation

The EGR valve (http://motoralldata.com/alldata/MOTOR%7EV31464278%7EC37357%7ER0%7EOD%7EN/0/77993956/78154671/92727709/92727711/34853741/34857029/34857699/34872079) will open when the conditions of operation have been met. This allows the exhaust gasses to re-enter the combustion chamber. When too much exhaust gas is allowed to enter the chamber, the proper combustion will not occur. For this reason, only very little exhaust gas is allowed to re-enter the combustion chamber.

(Courtesy General Motors)

Now, that's what GM says. Bottom line, allowing exhaust gas (inert air, cannot support combustion) to mix with the incoming air/fuel mixture DOES lower combustion chamber temps. allowing increased timing w/o the associated "pinging". So, it's an easy, popular fix.

Highly effecient engines (Quad-4, Eco-Tec, etc.) don't even use egr valves. Why is that? They are also very powerful (hp per cu. in.). They efficiently burn the a/f mixture w/o the high combustion chamber temps. due to their design (4 valve, overhead cam).

What does this mean for us? Well, it ain't gonna get us fuel mileage points, that's for sure. BUT, by restricting or eliminating egr, we have more oxygen available for combustion. Which means..........

BINGO! The MAF will see more air, allowing for more fuel delivery. We derive our power from the fuel, so, at part throttle, the engine will become more powerful (efficient? ehhh) resulting in part throttle driveability increases.

I restricted mine first, then totally eliminated it. Big difference. But, pre-95 you use a chip to compensate (for elimination). Most 95 and later, you restrict it w/o a program. Works like a champ.

But remember, it does nothing for full throttle as egr has no effect there (no egr operation at full throttle)."

[DavidH71]

couldnt it be installed by just removing the ac from its mounts and putting it aside then getting to it from there?

[4lowlife]

I installed mine today. I removed the serpentine belt, air intake, and AC compressor. (4) 13mm bolts hold the compressor down. I didn't have to remove anythng else.

I took it out for a spin and didn't notice any SES lamps. I think after a few startup and driving cycles the engine will recognize the mod. Haven't noticed any power.

[jlp7t]

I have one of the 96-01 versions of these for sale that I bought a couple of years ago and never installed (bought a Subaru STi and spend all my time/money modding that). $30 shipped to the lower 48 states. E-mail me (jlp7t@hotmail.com) if interested.

[Joker2040]

couldnt it be installed by just removing the ac from its mounts and putting it aside then getting to it from there?

yes, some people do it that way.

[rprice702]

What Kind Of Chip Do You Need For The Pre 95 Cpi And Wha Kind Of Metal Can I Use For A Block Of Plate I Have Some 1/4 Inch Alluminun Will The Engine Get To Hot For It

[1low_s10]

so this doesnt do anything for gas mileage right?

[boosted_4.3]

how can i compleatly remove it form my 98

[warp9pnt9]

Sparky has mention this doesn't gain gas mileage points? But does it HURT them? How much? And what else is a result? More oxides of nitrogen in the atmosphere? Less? What if this is done in concert with a 160 or 180 degree thermostat mod? Will the engine combustion temperature then be low enough temperature to prevent the need for an EGR to begin with? Can my OEM computer in a 1997 Blazer ZR2 cope with all this? Need a new computer? Or should I hack the software on it?

[warp9pnt9]

To answer my previous question, which has not yet appeared:

http://www.s10planet.com/forum/showthread.php?t=4248

I'm all for increasing performance, but at what cost? After reading this, I wonder if this will release NOx and pollute the air, or if the catalytic converter compensates.

NOx in the air reacts with sunlight and other chemicals to produce smog in populated or high traffic areas, which causes harm to the lungs, especially children, elderly, and disabled. And after that, the NOx eventually becomes acid rain. So not releasing it would be a good thing.

If the catcon can truly handle all this, then great. If not, I'll personally look at other ways to tweak my ride.

[tspears]

i completey removed my egr valve on my 01 blazer with a 4.3 and made a block off plate for it. and now i have a check engine light on. will that inline restrictor help my light go off.