VT 304 cranks but Not firing

[nes138]

Engine wont start - cranks but no fire, not even a pop

REPLACED - Ignition module, PCM (No VATS chips), BCM, MAF (glad I have spares but nothing worked).
CHECKED - ALL the fuses, spark from the leads and coil pack and show spark from both a timing light and a spark gap thingy!, checked fuel pumping with a drain hose after the regulator, override the fuel pump relay to permanently on, tipped fuel down the throat, battery has full power, put an external injector into the harness to check pulse and could feel it twitch, put fresh fuel in,

Was running and kinda slowed to a stall and that was the last of it.

 

[Immortality]

Might be time to wire up a temporary engine check light if possible and test for fault codes.

Alternately get a ALDL cable and hook up a laptop with tunerpro to see what the PCM is doing.

 

[nes138]

Here lies the problem, I have lost all coms to the tech2. So as per the thread start I replaced the BCM PCM etc etc

 

[Immortality]

Maybe you have fried something in the wiring?

Do you have a multimeter so you can test and make sure the BCM/PCM are getting power etc. Or maybe a problematic memcal?

 

[nes138]

multiple memcals in the PCMs.....

 

[Immortality]

Have you checked the ignition timing?

If you have fuel and spark you should have broom broom.

 

[gtrboyy]

Never used tech2

But just put into diagnostics mode read flashing faults off test light see if anything comes up that way.

 

[nes138]

Never used tech2

But just put into diagnostics mode read flashing faults off test light see if anything comes up that way.

Very easy, I have not hooked up the engine check light yet, I pulled all the wires out of the cluster to attach to my "analogue" instruments, hence the tech2

 

[nes138]

Engine wont start - cranks but no fire, not even a pop

REPLACED - Ignition module, PCM (No VATS chips), BCM, MAF (glad I have spares but nothing worked).
CHECKED - ALL the fuses, spark from the leads and coil pack and show spark from both a timing light and a spark gap thingy!, checked fuel pumping with a drain hose after the regulator, override the fuel pump relay to permanently on, tipped fuel down the throat, battery has full power, put an external injector into the harness to check pulse and could feel it twitch, put fresh fuel in,

Was running and kinda slowed to a stall and that was the last of it.

Still nothing although the Tech2 is showing a connection and can read data - NO FAULTS

 

[Not_An_Abba_Fan]

If it slowed to a stall then I'd be looking at fuel. Check the fuel pressure in line, not just the pressure from the line. Hook up your fuel pressure gauge between the rail and the regulator.

Have you pulled the spark plugs to see what they look like?