EGR Delete! BLOCK OFF PLATE

[OnlySonoma]

Hey Everyone!

I own a 1995 GMC Sonoma SLS 4.3L V6 TBI RWD.

I recently made and EGR Block off plate to stop those pesky exhaust gasses from entering my cylinders

The EGR on my Sonoma is electronically actuated which makes this a very simple and fun project.

First, you will need to remove the air filter housing to have easier access to the EGR.
Next disconnect the wiring from the back by pulling on the plastic plug. Be careful not to snap the clip as it will probably be old and brittle.
Next, remove the 2 bolts that hold the EGR in place. You will now have something that looks similar to the pictures. The installation is the exact same as the removal, except with a plate between the EGR and the intake manifold. I suggest adding some high temp liquid gasket around where the ports would be.

I placed my EGR on a sheet of steel and used a scribe to draw the outline.
I used a grinder to out out my design and a drill to make the bolt holes.







--OnlySonoma

 

[G-525981]

What did you do with the vacuum lines?

 

[Albert]

Want to modify your jimmy or Blazer S10 egr and keep the CEL out without a delete of the program in the computer or installing an expensive egr delete plate. Simple fix, remove the existing tube from the exhaust manifold and the intake. Save it. You will need to cap off the exhaust fitting on the exhaust manifold, I used a #10 stainless steel hydraulic cap or you could cut the end off of the tube you removed and weld it closed. A gas line cap is also available at Home Depot. You will have to remove the fan belt and AC compressor, not the compressor lines, from its mount to allow access to remove the egr line from the intake, just place AC compressor out of the way for now. Disconnect the plastic air intake housing from the top of throttle body. With the egr line you removed cut it in half, remove the fabric heat shield covering that will not be needed any longer from the section of line that connects to the intake. This section of line will be connected back to the intake, this section of line is bendable so slowly bend it vertical. (See pictures) It’s almost a straight shot to the air intake plastic housing. Temporarily reinstall the plastic air intake back onto the throttle body. With the section of egr line you reconnected into the intake slowly position the line vertical to match up to a position on the flat bottom of the air intake and mark the air intake housing where the line will enter into the air intake, mark the line so about 1 inch of metal line will be inside the air intake housing. I recommend moving the hole over 1/4” more than I did from the edge of the plastic housing in case you want to use a rubber grommet to insert the line into. Cut the metal line you marked that will be inserted into the air intake housing in the hole you drilled in the bottom of the air intake plastic housing. carefully drill the hole to fit the size of the metal line that will be fitted into the housing or you could go to Home Depot and purchase a rubber grommet to insert the metal line in to that would require a larger hole to be drilled into the plastic housing for the metal line. (Will look similar to your pvc valve installed in the valve cover) I installed mine with a couple of rubber O rings on the metal tube that fit against the bottom of the air intake housing to prevent leakage of non filtered air. You could use a plastic tie under the O rings to prevent them from sliding down the metal tube during installation of the air housing onto the throttle body. Reinstall the AC compressor and fan belt and carefully reinstall the air intake plastic housing, ensure the metal tube fits into the plastic housing where you drilled the hole in the bottom. The O rings should seal this area to prevent debris from entering the air intake. One guy asking about the mod suggested using a rubber line in place of the rigid metal line from the intake to the air inlet plastic housing, that would work also, I am cheap, the complete mod cost me $2.00 and that was the SS cap for the exhaust manifold cap off. With this installed you now have cool air entering the intake when the egr valve is operating. The egr valve or computer does not know hot exhaust gases versus cool air. You will not have the carbon building up in the intake area and it will keep exhaust heat away from the fuel injection spider lines. @if you live in a state with emission inspections it should still pass inspection as you have not removed the egr valve.
Note: update with over two weeks of operating with this modification no problems noted, engine runs smoothly, no hesitation, no CEL, life is good in the S10 world.