'89 B2, 2.9l died, won't start despite fuel pressure and spark

Hi,

my '89 B2 2.9L 4x4 died on me with short prior stuttering.
Starter & and battery are new and it cranks fine, no check engine light.
I checked spark and compression, both OK and it will fire up with starter fluid but NO sign of firing at any of the cylinders upon cranking without
the starter fluid.

So I began looking at the fuel system

Following parts have been replaced, 2 months ago:

- new tank, new fuel pump, new filter, pressure regulator

First I checked all fuses, inertia switch, the pump relay and
for leaks everything OK. The pump engages fine upon turning the key.

Next step:

I rented a fuel pressure tester sets and it gave me
0 PSI at the Schrader valve. I got another one and
it gave me the same result, so I took a closer look
at the thing and noticed that there was no pin on
the tester adapter to actually open the valve

So I improvised:

Upon having someone turn on the ignition and myself pushing down the pin on the Schrader valve (after regulator!), fuel came squirting out pretty good. To make sure that the pressure is enough, I unhooked the hose on the new pressure regulator that goes back to the tank to see if it is rerouting excess gas to the tank and it came squirting out of the regulator pretty good, too. So everything is working fine there as far as fuel pressure is concerned.

Next thing I thought about:

- "if I spray starter fluid into the intake manifold, I bypass the
injectors and provide the mix directly through the air intake.
Since it fires up and runs, maybe the injectors don't get any juice"
(It's highly unlikley that all of them would fail at once)

So I unhooked the connectors, set my multimeter to 15 DCV,
red in red, black on neg of battery and I get: stable 12V, dropping
to 10,6 upon cranking.

So my questions are:

I assume the multimeter is too slow to display the current being
delivered as a pulse. Do I need to get a NOID lamp tester to see if the injectors are getting the right impulses?

Is there anything else I am missing here?

Tested with NOID set: I get pulsing lights on several injector connectors so the computer seems OK.

What now? Anybody any ideas?

Not sure if you realize this, but you posted in an archive folder that is for fixes to common problems...the moderators will probably move it, but if you still need help you might want to post it in the Need urgent Help or appropriate engine forum.

Might get better results than here...

I thought I didn't qualify for the urgency forum. Well if I do, I will send a pm to any moderator with request to have this thread moved. Yes, the problem still persists and I have no idea what else to try, it's a mystery...

You've probably located the problem by now, but I had a similar issue with my 2.9.
Good fuel pressure when bypassed at the test connection, nothing with the normal ignition. It would run if fuel was squirted into the intake but died when that fuel ran out. The problem was the small grounding wire from the battery cable which supplies the fuel pump and injector grounds and several others according to a wiring schematic. Apparently that wire connection had broken. Simple fix, but without the diagram I wouldn't have suspected it.