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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 05-27-2011, 02:29 PM
Tazz54 Tazz54 is offline
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1991 f250 460 fuel injectors not triggering

Ive got a 91 f250 460 and there is no current to the fuel injectors i am lost and dont know where to start lloking for the culprit thansk for any and all info to this problem Tazz
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Old 05-27-2011, 04:48 PM
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1st thing to check is the small ground wire with a round, black connector on it coming out of the negative battery cable terminal. If that is not connected or has a poor connection, you will not have a ground to the computer and the injectors will not fire. This wire goes straight to the computer ground terminal. The check engine light will not come on when you turn the key on if the computer is not getting a ground or not getting power.
If that is good, you can dig deeper:
I power wire feeds all 8 injectors and they are controlled by the computer turning the ground to them on and off. It fires 4 injectors at a time, so there are 2 ground wires and one hot wire going to the main connector on the computer. Start by getting a Ford wiring diagram for the truck and checking continuity between the appropriate 3 pins in the computer connector and the injectors.
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Old 05-27-2011, 05:28 PM
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The power to the injectors comes from the EEC Power Relay over a Red wire.
The relay is turned on and off by the Ignition switch.
This same Red wire also powers the Computer, other solenoids and the fuel pump relay coil.
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Old 05-27-2011, 07:43 PM
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Thank you for the info ill check this wire and where can i get a wiring diagraphm can i possibly get 1 here?
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Old 05-27-2011, 07:47 PM
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Hi Bill thanks for this info ill check this out hope i find the source Where would i find this EEC Power Relay and BuickBrain meentioned getting a wiring diagraphm to check on three wires going to the computer Where could get one of these? or possibly on here? Thanks Tazz from Collins Mo
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Old 05-27-2011, 08:12 PM
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Here is two diagrams of the 1990, I think the 1991 is the same:
Click the image to open in full size.

Click the image to open in full size.

/
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Old 05-27-2011, 08:16 PM
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The ground for the computer (G102) and the EEC power relay (G201) are not the same place.
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Old 05-27-2011, 08:16 PM
 
 
 
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