Hello all,
Some of you do Zs also, so hopefully I can get some help. I'm working on
a 72 240Z that is having a problem that I just can't sort out. It
accelerates great till about 4500 rpm then it just hits a wall. The engine
just goes
flat. If you back off the gas you can sometimes nurse it through. Get above
5000 and it seems alright again. If you just hold your foot down it just
bounces
off of 4500, slows down, picks up again, then bounces off it again.
The trouble started after we had a valve job done. In the process we
took of smog bits on the manifold and plugged the holes. We plugged the air
ports in the exhaust manifold and ground the bumps flat. It is running the
later
electronic distributor and has new plug wires, cap and rotor. The
compression is 175-185 on all cylinders.
So far we have changed the coil, put the old distributor back in,
changed carb needles and adjusted them a bunch (something I know a little
about),
varied spark plug gap, added an electric fuel pump. The only thing that helps
is to remove the air cleaner and base plate. Basically what that does is
remove the air horns. I know that makes some difference but it should not make
that much of a change.
Anybody have any ideas before I pull all my hair out?
keith
|