Toyota Trucks: EGR Service on 93 22RE

Thanks to everyone who posted answers to my earlier question earlier about
injectors.

Does anyone know how well the EGR valve is supposed to shut when it is not
activated (no vacuum to EGR valve)? I am working my way through possible
causes for stumbling at low acceleration. All of the EGR tests I have found
address whether the thing works at all (it does). None address whether the
thing is sealing well when it is supposed to close. Since this can cause a
vacuum leak, I decided to test by removing the tube that connects the the
valve to the air intake chamber, then connecting a hand vacuum pump to the
valve outlet (manifold side) and pumping away. The valve leaks enough that
the gage on the pump never moves. I removed the pump and sucked/blew on the
hose -- the leakage is obvious. Should it seal well enough to hold some
kind of vacuum for at least a couple of seconds or so one cannot suck
through it?

I have blanked off the valve connections and will drive it a couple of days
and see if there is a difference. If so, I intend to pull it when I am
replacing the fuel filter. Then I guess I'll try to clean it. Any
suggestions on how to do that? It looks like there is no direct line of
sight from the inlet/exit ports to the valve area. Replacement is quite
spendy.

Thanks.

Jim Andrus

EGR valves are designed to hold vacuum as long as needed. When driving on
the highway,the egr valve is opened the most, basically reheating the
exhaust gases coming from pipe back up to egr valve, through manifold and
ignited again. Sometimes they get carbon build up inside them, not allowing
them to function properly. At this point, you could try to clean build up
out, but makes most sense to replace.
"James Andrus" <net> wrote in message
news:iQcXb.31940$ops.worldnet.att.net... 
the 
the 
I 
I 
leak 
My 
my 
the 
whether 
on 
some 
am 
of 
quite