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No injector signal

Oldcomguy

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Hi, well if you've seen my other posts you know where I'm up to.
My VP 5ltr ute runs on LPG but will not shoot fuel from the injectors.
I tested this by removing the fuel rail and wiring up one injector and tapping the negative, fuel sprayed out as inspected.
I don't have hi tech tools to test it any better.
My question is, where does the pulse/signal for the injectors come from?
Is it the ecu or distributor?
Anyone have similar problem?
 

_R_J_K_

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will not shoot fuel from the injectors.
I tested this by removing the fuel rail and wiring up one injector and tapping the negative, fuel sprayed out as inspected.
So does the injector spray or not? That statement doesn't make sense.

Pulse is provided by the hall effect sensor in the distributor which is then sent to the ECU to trigger the injectors. If it is the hall effect sensor, pretty sure you won't have any spark either as the ECU also uses the sensor to control the coil.
 

Oldcomguy

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Yes it sprays when the injector is connected to battery
 

the_boozer

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My VP 5ltr ute runs on LPG but will not shoot fuel from the injectors.
I tested this by removing the fuel rail and wiring up one injector and tapping the negative, fuel sprayed out as inspected.
I don't have hi tech tools to test it any better.
My question is, where does the pulse/signal for the injectors come from?
Is it the ecu or distributor?
As it runs on gas the distributor must be all right how is the gas change over wired? When its running on gas the injectors must be turned off find that wiring and test the change over. No idea how that is wired ? As you said it is a vapour system. Is there 12 volt on the injectors when its in petrol mode? the injector negative comes from D15 &D16 on the ecu ,the positive from the efi relay. As most gas systems start on petrol what has been done to get it to start on gas?
 

Oldcomguy

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I'll post up a pic of the gas wiring, it has 3 relays.
Will do some more basic tests.
 

Oldcomguy

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I tested for power at the injector plug and have 12v at both wires is that correct?
 

the_boozer

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with the injectors in circuit it would be. the 12 volt your seeing on the other wire would be coming thru the injector.
 

Oldcomguy

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This test was done while the injector was unplugged
 

the_boozer

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