Bob,

   Thank-You for the post

   What specifically was causing the intake valve to hang up in the 4.6 you
saw this occur in?  Was it a stem/guide issue,
or was it related the the valve actuating equipment?  I swapped # 1 injector
with
the adjacent cylinder and cleared the codes hoping when "check engine" comes
back on it will indicate problem in the swapped cylinder rather than # 1. If
that doesn't pan out
I can't think of anything left but valve train malfunction. What do you
think?

   Thanks  Brad

No.

If the plug wires are original with high mileage, there's a chance for
cross induction from one to the other if one of them goes high
resistance, but if the leads are all dressed the same way they were, I
don't think so.  You should, just for drill, check the DC resistance
of your #1 and adjacent plug wires just to check.

This sounds like an intake valve hanging up, which I've seen on the
4.6L before.  Compression will test fine at cranking and idle speed,
then the intake valve will start to hang up (or close late) at power
speeds, causing a backfire into the intake.

Hi,

   My '95 Town Car with 4.6 SOHC V-8 is missing on the # 1 cylinder.  The
computer says so,  and the spark plug indicates incomplete combustion as it
is pretty black compared to all the others.  Sometimes it the engine
backfires into the intake plenum especially under acceleration.  I have
eliminated the coil pack (swapped sides), spark plug (replaced all) , and
spark plug wire (replaced) as the problem.  Should I be looking at fuel
delivery i.e. plugged injector, or even valve train problems or is there
something I have overlooked in the ignition sector?  My gut tells me it's
ignition related, especially because of the intermitent "cough" up the
intake manifold...reminds me of crossfire.  Is there an
electrical/electronic component that would only effect the # 1 cylinder that
I haven't already checked out, or should I move on to fuel or valve train?

   Thank you in advance anjyone who can help me.

                           Brad