I changed both the EGR and O2 sensor on my 94 in August. The EGR valve is
fairly easy to remove with only 2 bolts facing the front of the engine.
It's a little trickier to replace because you can't reach two hands in to
hold the valve while you replace the bolts. But, still not difficult. The
valve has a wiring connector on it. The replacement valve I bought was
made with the little click tab on the connector on the wrong side. I had
to break off the click tab and fasten the connector with a length off
wire. Double check the connector when you buy it or be prepared to do some
inventive rigging. I had more trouble with the O2 sensor. Hard to see on
top of the pipe and hard to reach without burning yourself. Hope this
What code did you get on the EGR? They are notorious for getting stuck
partially open by a small chunk of carbon
that comes up through the manifold. The valve itself is REAL easy to
change, I got so good at pulling and cleaning the
one on my wifes '94 that I could have it in and out of the shop in under
20 minutes. The symptoms of one stuck a bit open are very rough idle and
sometimes stalling when idling, BUT higher RPM operation shows no real
difference. If you clear the codes and then start the engine the code
usually doesn't return till you let the rpms drop to idle speed.
As for the O2 sensor they can be difficult to remove if they are
original, then the new one just screws in.
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