It is a valve just behind the Throttle body. (part that looks like the old
carburetors of the past)
It has a vacuum line going to it. It's about 2 inches in diameter and comes
to a point with a diaphragm inside.
I did the EGR mod on mine with a metal plate. I'll see if I can find the
instructions for that.
no, it won't and you stand a very good chance of ruining your pistons
when the EGR is commanded by the ECM and the timing is advanced by the
ESC. pinging is a very bad thing. I've never understood what people
hope to gain by bypassing the EGR system which isn't even used at WOT
the Exhaust Gas Recirculation system is more or less a way to adjust
effective fuel octane on the fly. it is used during cruise to slow
the rate of fuel burn (the definition of octane) so more timing can be
run, reducing emmissions and increasing mileage. if the EGR valve
sticks, when you come off the highway exhaust gas will still be routed
through the intake. this will dilute the air/fuel mixture and make
the charge barely burnable, hence the stumbling and rough idle.
the egr valve itself is about $40 for a Wells P.O.S. from autozone or
around $75 for a quality one from NAPA or Carquest. on a small block
V8, it's a piece of cake to change them, I've heard on the V6 it can
be a bitch to get them out.
On the 4.3 it is buried inside the fuel lines and such, difficult to get to,
but possible. I believe I had to remove the line from the TBI to get enough
room to get at the bolts.
I didn't bypass the EGR, I just made the opening smaller so the ECM would
The 2.8L (I think that's what the econo-box 4banger in 88 was) is easy
a frikken pie. It's hanging right there, screaming "please fix me, I'm
not supposed to be hanging off in two pieces". But ole LGM replaced
just about everything BUT the obviously-broken-EGR valve, not knowing
what this "floppy thing" was.
$100 at the shop.... and a lesson learnt the hard way. Search the
other threads as well, there is a link for a site that makes a gasket
with a filter that stops the carbon from getting in them (what kills
an EGR valve)
-The Lonely Grease Monkey
1985' K5 305CUI TH700R4 NP208
"Ignorance is preferable to error; and he is less remote
from the truth who believes nothing, then he who believes
what is a wrong."
- Thomas Jefferson
compare any wells part to the equivalent NAPA Echlin part. the
differences will become obvious. after the 4th Wells brake switch
failed in my truck and after the 2nd Park neutral switch.... I quit
trying to save a short term penny by buying crap parts.
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