EGR bypass? (1 Viewer)

[cbmontgo]

I am troubleshooting my EGR valve and would like to bypass it if possible. Can this be done by simply capping off the inlet and outlet to it as well as the vacuum line that exits the side?

Anyone got pics of this being done? Did a search and found surprisingly very little on this.

 

[1911]

There is a pretty detailed procedure for checking the EGR valve (and all other components) in the "2F Engine Emission Control Repair Manual" that you can download right here from Mud; it requires a vacuum gauge however.

But the most common problem with them (in my experience) is simply that they become stuck/inoperative due to heavy carbon deposits.

 

[cbmontgo]

There is a pretty detailed procedure for checking the EGR valve (and all other components) in the "2F Engine Emission Control Repair Manual" that you can download right here from Mud; it requires a vacuum gauge however.

But the most common problem with them (in my experience) is simply that they become stuck/inoperative due to heavy carbon deposits.

I removed it last week and noticed that the "piston" in it was stuck. I cleaned and lubed it, but it ran even worse after reinstall. I'd like to swap in a new one of bypass the old one to confirm that this indeed the problem.

 

[cea1]

Do a search in the 60 series forum and there is a ton of information about bypassing the EGR valve. All you need to do is put a BB in the vacuum line from modulator to the EGR, or cap off the lines as you suggested.

 

[cbmontgo]

Do a search in the 60 series forum and there is a ton of information about bypassing the EGR valve. All you need to do is put a BB in the vacuum line from modulator to the EGR, or cap off the lines as you suggested.

Will do...thanks

 

[Pin_Head]

Do a search in the 60 series forum and there is a ton of information about bypassing the EGR valve. All you need to do is put a BB in the vacuum line from modulator to the EGR, or cap off the lines as you suggested.

This is correct. Just make sure that the valve is closed and not stuck open.

 

[cbmontgo]

This is correct. Just make sure that the valve is closed and not stuck open.

I am thinking that it being stuck open is causing the idle issue via creating a big vacuum leak. What's the best way to tell whether it's open or not? Remove it and blow through the bottom port?

 

[Downey]

EGR System

Since there is no such thing as being a "percentage" of smog legal (either zero or 100%), if Colorado wasn't going to sweat out their anus about what's under your hood, I'd abort the entire EGR system. The problem with trying to be a purist and save all of the emissions devices is that all of it was dead many many years ago. No doubt all of the valves are frozen, full of rusty water, or merely rotted/cracked beyond repair. When we were trying to get the TBI conversion to be smog legal back in the 1990's, we couldn't find any smog pieces (that the c.a.r.b. required to be retained) that were not shot. We were looking for 14 year old stuff, no longer available from Toyota, 100% of it defective---we actually epoxied some smog parts together in an effort to move forward with the testing.

 

[SteveH]

You can install a blockoff plate, sandwiched between two gaskets at the EGR exhaust inlet, and leave all the rest there for cosmetics. I would also put a BB in the line so that any diaphragm leaks don't haunt you later. I have done this on several FJs.

A blockoff plate should be thick steel (1/4"), but other than that, it's just an oval hunk with two holes drilled in it. If you have removed the manifold for other reasons, just drop a small piece of round bar stock in the EGR hole and weld it around the perimeter to completely seal the manifold and make the problem go away for good.