EGR (Exhaust Gas Recycling)

[turnturn]

I'm in the process of removing this system from my Mu and was wondering what triggers this system to start working?
I understand that the twin valves on the intake manifold are operated by vacuum, and this vacuum is activated by twin vacuum/electric solenoids over by the brake booster but cant figure out what tells the solenoid to switch on and off. Is there a sensor somewhere? Is it throttle position/load?

[pig75]

Temperature and throttle position

[turnturn]

Aaaaaahhhh................ So that's what the rotary encoder on the top of the injector pump is for?

[geeves]

If yours is electronic best leave it alone. If it is you should have a fly by wire throttle. If not I think thats the boost compensator. For egr the throttle and temp feed into a computer under the center consol which does the rest.
All you need to worry about is blanking off the 2 valves and the exhaust feed to them. The rest can be let as is

[pig75]

The EGR system

egr.jpg

[turnturn]

Geeves. Mines not electronic (1994 4JG2-T). I had considered just blanking things off but decided to remove it completely. Less clutter is good in my book.
Just in front of the boost compensator is what I had earlier called a rotary encoder but I see in the image supplied by Pig75 that is actually called a potentiometer.

Pig75. Thanks for the image. It cleared something else up for me. The other wiring coming out the inboard side of the injector pump is the RMP sensor as I had thought but didn't know for sure. Thanks.