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I want to know where the signal comes from sent to the ECM

Customer Question
Customer: My name is *****...
Customer: My name is ***** ***** I want to know where the signal comes from sent to the ECM to fire the fuel injectors on a 90 460.
JA: Thanks. Can you give me any more details about your issue?
Customer: The vehicle is flooding so bad it wont run and wont build fuel pressure. The injectors are going wide open with key on.
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Submitted: 1 year ago.Category: Ford
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Answered in 20 minutes by:
1/6/2016
Ford Mechanic: Tim Mohr, ASE MASTER TECH replied 1 year ago
Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: Ford
Satisfied Customers: 16,051
Experience: 30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
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Hi, my name is ***** ***** model is this?

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Customer reply replied 1 year ago
It's a 90 E-350 RV
Ford Mechanic: Tim Mohr, ASE MASTER TECH replied 1 year ago

ok, power to each injector is supplied to each injector with the key on, the PCM then grounds each injector individually to fire each injector, are all the injectors running too rich?

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Customer reply replied 1 year ago
Tim, I know the injectors are fired by a driver in the ECM on the ground side.I also know all injectors have 12 volt power with key on. All of the injectors are going wide open with key on which means the driver in the ECM is getting the wrong signal to ground them individually. My question is, where does the ECM get the signal for injector fire ? Is it the stator inside of the distributor ? I don't see where this vehicle has a crank position sensor on it.
Customer reply replied 1 year ago
P. S. The ECM has already been switched out with no positive results.
Ford Mechanic: Tim Mohr, ASE MASTER TECH replied 1 year ago

Yes, the stator gives the cam signal, but the comuter uses the maf sensor, the oxygen sensor and the coolant temp senor to give the pulse width for the injectors, do you have a fue gauge on it, to see what the actual fuel pressure is?

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Customer reply replied 1 year ago
It will not build fuel pressure because as soon as you turn the key on the injectors go wide open. I know this problem is not that complex but my scanner does not give me any data because the vehicle is too old.
Ford Mechanic: Tim Mohr, ASE MASTER TECH replied 1 year ago

even with the injectors wide open, it should still build pressure, you might have a stuck open regulator, have you disconnected each injector and seen what the pressure does, with all injectors disconnected?

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Customer reply replied 1 year ago
The regulator has been changed out. I have not disconnected all the injectors and checked fuel pressure that way. Can you explain to me how it will build fuel pressure with the injectors wide open ?
Ford Mechanic: Tim Mohr, ASE MASTER TECH replied 1 year ago

even with the injectors all running full rich, it will not cause the fuel pressure to not build, the injectors are not designed like that, can you try discom=nnecting all the injectors and seeing if the fuel pressure build up?

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Customer reply replied 1 year ago
Will do
Ford Mechanic: Tim Mohr, ASE MASTER TECH replied 1 year ago

let me know,Tim

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