Check the blue wire and make sure it's not broken, at the distributor, also check the wiring near the EGR to make sure it's not melted.
You have RPM movement on crank with the gauge?
What about with a scan tool, does it show the RPM's moving when you're cranking?
CRANKSHAFT POSITION IS DETECTED BY THE CRANKSHAFT POSITION SENSOR AND THE PICK−UP COIL INSTALLED INSIDE THE DISTRIBUTOR. THE CRANKSHAFT POSITION IS INPUT AS A CONTROL SIGNAL TO TERMINAL NE2+ OF THE ENGINE CONTROL MODULE, AND ENGINE SPEED IS INPUT TO TER
I have RPM movement on the scan gage. It only cranked over 2 times cause the battery was pretty weak after sitting for this long and lots of cranks over the past week. It read 77rpm briefly on my scan gageI'm just trying to establish if there is a tach reading at all.
So I did some digging last night and here's what I got so far...
The tach does move when cranking, now does that equal RPM from the crank sensor, it does not appear to. However, I needed to put slow mo on my camera to actually verify the movement.
View attachment 2662115
View attachment 2662114
However, what it does have... is an RPM signal, even in a cheap off the shelf scanner that costs less than $100.
The crank sensor has a brown wire, a blue wire (known to cause problems at ignition coil connector) and a white wire with black tracer.
@ I20 ( apparently behind the glove box ) the blue wire splits from there to the ECM and the distributor.
Hook up a cheap scan tool and see if you have RPM signal.
For reference I disconnected my distributor and had NO RPM signal on cranking.
Video - 2021-05-01 13.53.04-1.mp4 - https://www.dropbox.com/s/2vcmvwiry0p6v5q/2021-05-01%2013.53.04-1.mp4?dl=0
Reconnected distributor, disconnected fuel relay, HAD RPM signal on cranking.
Video - 2021-05-01 13.58.50-1.mp4 - https://www.dropbox.com/s/pj484g08xb54i3y/2021-05-01%2013.58.50-1.mp4?dl=0
Reconnected fuel relay, disconnect crank sensor harness, HAD RPM signal on cranking, vehicle started.
Video - 2021-05-01 14.06.36-1.mp4 - https://www.dropbox.com/s/bj7q4mb9e9xur95/2021-05-01%2014.06.36-1.mp4?dl=0
NO RPM on scanner? My money is on Distributor or broken blue wire or melted wires near EGR.
Being as my truck started with the crank position sensor disconnected completely.... I would say if your truck isn't starting and has no RPM signal, check blue wire @ distributor connector, perform amp load test on wire, all checks out? Replace distributor.