2000 Ford F53 6.8L V10 Won't Start

[wdshea]

Would erroneous MAF or Cam data stop injector pulses?

I have not used starter fluid, next time i'll try that.

[Lightning777]

Have you checked for plugged exhaust, (Melted cats)?
Not sure how rusty it is down there, but remove O2 sensors or drop the pipe at one manifold. and see if it will fire. If everything is too corroded to remove, you can throw a vacuum gauge on a manifold vac source and crank with the throttle closed. It should pull about 5"hg at around 200 RPM (normal cranking speed) if not, there is a good chance you have plugged exhaust. However dropping a pipe at the manifold is more reliable.

[wdshea]

Well... just after the Y flange the exhaust system had been stolen. Essentially, there is no exhaust system.

I am curious about the vacuum under starting conditions. If good vacuum isnt achieved, maybe that is evidence of incorrect valve timing.

I still suspect the injection issue is computer related, and not input related.

[decipha]

no a bad maf would resort to failed maf table and still pulse

if cam didn't sync or is reporting incorrectly it would simply be ignored and still batch fire

melted cats wouldnt stop injector pulses

for exactly 5 pulses every time the ecu is definitely doing it for some reason. Only way i could see that being possible is if the caps are bad and it looses residue juice to be able to fire the drivers again. That would be an extreme long shot but i don't see how its otherwise possible.

I think your issues are otherwise and you are misinterpreting the pulses.

If your loosing fuel pressure you have an issue there.

[wdshea]

Cam and crank data is supposed to correlate?

If i open the PCM, would cap failure be obvious? I imagine i'd have to remove the cap's to test them... not gonna do that.

I need to clean grounds, and verify spark with starter fluid. If it won't fire, is it possible for crank timing to be off? (I mean, crank sensor timing reference)

Despite the injection issue, and if there's no fire, i could be mistaken about compression. I'll do a compression test.

Fuel pump, fuel filter, plugs, o2's, water pump and all fluids are standard for me to replace when i get a used vehicle... i'd like to see it run before i drop the tank.

Unfortunately, the vehicle is an hour away.

[decipha]

not sure what u mean by correlate but cam sensor isnt required just crank

yep, no u dont have to remove to test. Caps never fail on the eec v at least Ive never seen or heard of one.

yea but that wont stop the injector pulses after 5

[wdshea]

Correlate meaning, crank sensor and cam sensor data need to "make sense" to the PCM.

For instance, if the cam sensor indicated the intake valve was open for cylinder #1, but the crank sensor was indicating cylinder #1 was in compression and to fire.

I'm a pretty good technician and mechanic, but when it comes to PCM level control, i have no clue.

Will Forscan support the F53?

[decipha]

crank sensor has no idea where the cam is

cam sensor is used to fire sequentially, if u suspect its bad simply unplug it as its not needed. But no, if the cam doesnt sync then it will run in batch fire no problem.

Im not sure how much support it has but will be able to at least pull codes and read live data.

[Lightning777]

This is a bit of a shot in the dark, but you said you unplugged the coils on the cylinders that the fuel rail was pulled from. Is it possible the PCM is shutting down the drivers to those injectors due to the circuit failure codes that set for the disconnected coils? They will shut down when a catalyst damaging misfire is detected to protect the cats. Not sure what the strategy is for this, but it might explain the 5 pulses, then nothing. Definitely doesn't help with the no start though.
I agree with decipha, I think your issue is elsewhere. It doesn't really add up, it should fire at least a bit from the 5 pulses of fuel if there is spark and compression.
Pretty tough for a COP system to be out of time as well. make sure there is compression (in the ones you can access at least)
If the rail is still out, maybe reattempt your test with the coils plugged in.
Good luck

[decipha]

Profile correction has to be learned and the engine has to be up to temp before it can detect a type-a cat failure causing misfire and kill injectors.

Yeah something is amiss.