Yet another crank no start...strange

[Doubeleive]

ya with spark it's probably not the icm, but.... if the spark is weak, could be it is not carrying enough current or a bad ground
you can test the system with a meter, probe or even with a couple wires and a 12v bulb

 

[Ibustbravo]

My no-start, no ecm communication issue was the main harness ground. I forgot to connect it.. heheh.. It goes on the engine btw.. so maybe put some eyes on the battery terminals and grounds.

 

[res02p35]

I got a fuel pressure gauge form Autozone loaner program.
Once I turn on the key gauge goes to 55, then slowly starts dropping to 44 psi. It stays there.
Is that enough PSI?

 

[res02p35]

I got a fuel pressure gauge form Autozone loaner program.
Once I turn on the key gauge goes to 55, then slowly starts dropping to 44 psi. It stays there.
Is that enough PSI?

BTW, I did get another code reader. It says 0 DTC codes

 

[res02p35]

BTW, I did get another code reader. It says 0 DTC codes

I will pick up a new Wix filter from NAPA in the morning.

 

[Hoesgottaeat2]

Clean up the battery terminals too with a wire brush. Especially the dual layer positive cable. Known culprit for giving only partial power.

 

[Doubeleive]

I got a fuel pressure gauge form Autozone loaner program.
Once I turn on the key gauge goes to 55, then slowly starts dropping to 44 psi. It stays there.
Is that enough PSI?

Should be fine on fuel pressure

 

[Doubeleive]

Double check all wiring and fuses under the hood

 

[Doubeleive]

Also not sure on the obs but obd communication on the 00+ is tied in with the cigarette power port, check the left side dash fuses

 

[strutaeng]

I got a fuel pressure gauge form Autozone loaner program.
Once I turn on the key gauge goes to 55, then slowly starts dropping to 44 psi. It stays there.
Is that enough PSI?

Technically, not on the original "spider" poppet injectors. I haven't looked in a long time, but IIRC spec was like 58 psi. Although both my old 4.3 and my 5.7 have always started just fine with 55 psi. I installed the updated MPFI on the 5.7 because I had a dead injector when I bought it. The MPFI can work with lower pressure.

The pressure drop is a concern too. You either have an issue with the FPR and or an injector that's leaking fuel. When that happens the fuel floods the engine and can cause issues with crank-no-fire. How long does it take to go from 55 to 44?

I've never tried this, but I've read once a guy opened the throttle body and primed the pump and saw with a flashlight a huge squirt of fuel getting dumped inside the intake! Massive flooded condition in that case.