Originally posted by brapple:
as for the vac test I am not sure what exactly you do, I wasn't around when my father tested the egr valve. I suppose you would take one of the hoses off the dpfe and apply a vac to it




Yep. vac to EGR valve -> EGR valve opens -> engine coughs
and stalls at idle
(EGR is supposed to be closed at idle).

if you suspect the EGR system to be faulty and think that
the valve is not stuck open, you can disable the whole system temporarily.
I don't exactly remember how to do it, but I guess all you
have to do is disable the solenoid by disconnecting the
wire and maybe shorting the connector.
The engine should run fine (in fact better) w/o the EGR.

I'm also at diagnosing EGR, just waiting for my roomie to
dig up his vac pump and gauge

Tiv