cleaning EGR port

[susa2]

I searched FAQ at http://www.automotiveforums.com/vbulletin/faq.php

used both the single word EGR and the two words EGR port

no matches found

again, as subject says, cleaning EGR port and looking for steps & best methods

[marcre]

what year trooper do you have? What engine as well?

If it is a 98+, there is a great write-up in the FAQ's section, there is a link to it "stickied" at the top of the Trooper and Rodeo pages. There is a link within those threads that take you to the FAQ's page.

[susa2]

year is 93, DOHC 3.2

[marcre]

I'm not sure how to do it on that year trooper. I know it is way different than on my Rodeo, it may be wise to get a haynes manual.

What kind of problems are you having? The system you have doesn't clog up like the 98+.

marc

[Blue Bowtie]

That valve is a standard, GM/AC-Delco positive backpressure piloted EGR. Remove the valve from the base, clean the pintle area with picks, scrapers, and whatever is necessary to remove the coke and carbon from the valve pintle so it can seal poperly. DO NOT use any kind of cleaning fluid or solvent, since the valve has a passage through the pintle to the pilot valve:



The seal used in the valve pilot is made of an elastomer (rubber) which resists high heat, but because of this property it cannot resist solvents.

The ports in the intake, however, are fair game. Use whatever is necessary to clean them, including probes, picks, bent coathangers, solvents, harsh chemicals, compressed air, small thermonuclear devices, slave gnomes or pixies on leashes, whatever. Establish a clear path from the exhaust and into the intake plenum, make sure it's dry, then install the EGR valve.

If you are experiencing general EGR faults, you might also want to check the vacuum solenoid for the EGR valve and the vacuum source and tubing between all the connections.