troubleshooting EGR (V6, '93 100)

[William Magliocco]

Since all the signs point to EGR, I thought that I
would take a stab at looking around there.

the valve itself does something when I use a mity-vac
pump on it.  It is normally relaxed when at
idle->suction to the EGR valve makes the engine cough
and stumble quite nicely (until the ECU starts taking
over).  Similar results at 2000 RPM (parked) or idle.

Don't seem to get much action, though from the vacuum
feed going to it. Maybe the gage flutters 2-5 inches
of vacuum, but that's it-nothing steady at all.   The
rubber/plastic line from the solenoid seems OK, as I
can manipulate the solenoid (by the MAP unit)using the
existing hose.

what I don't seem to understand is the four vacuum
lines going to this contraption, and the small one way
valve also attached to it.  I thought the variable
duty cycle of the solenoid was to regulate the vacuum
throughput.  Maybe I'll just hook +12 power up to it
straight and see if I can get normal engine vacuum at
the EGR valve.

Elliott Potter suggested I go through the vacuum lines
as PM on the car due to aging.  He's right, as the
brading covers a lot of sins!

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