I am working on a 97 4.3 Vortec engine. I am removing the intake manifolds.
I have the upper (plastic) loose. I removed all 10 bolts, the fuel lines at
the back of the engine and all electrical connectors. The plastic manifold
is loose and moves around, but I cannot raise it off the lower intake. Do I
need to remove the screws (or nuts) where the fuel lines go into the plastic
intake manifold??? Do the injectors come off with the intake manifold?????
The gasket for the fuel injection unit is most likely holding it. You
know that big plug you pulled off in the center where the fuel rails go
in? The gasket sticks so its going to take some grunt work. Just be
carefull and work it slowly.
"You know that big plug you pulled off in the center where the fuel rails go
Does the other halve of the connector come off with the plastic manifold or
stay with the
bottom intake manifold??? Should I push the connector through the plastic
Yes the injection unit is clamped onto the lower intake. I think if you
push on it with your thumbs while you lift the plastic plenum with your
fingers it should separate. If there is enough space for your fingers.
Yes, you need to disconnect the fuel pipes at the solenoid block
where it enters the upper plenum. Watch for O-rings and which way
the hold down goes.
The injectors and the solenoid block will stay with the lower
half of the manifold, solenoid block being the rather largish
rectangular electrical connector next to where the fuel pipes
enter the upper plenum. Once everything is removed/loose, you
then push the solenoid block down as you lift the upper plenum.
The solenoid block seals to the upper with an O-ring, so a little
ooomph/wiggle/jiggle is necessary.
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