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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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I have a 88 f350 tow truck 7.5L. I have an injector problem.

Customer Question

Hi I have a 88 f350 tow truck 7.5L. I have an injector problem. I'm get power out the ground wire
JA: Are you fixing your F350 yourself? What have you tried so far?
Customer: Yes I am. I'm a mechanic. I've striped the harness checked all wires
JA: Have you checked all the fuses? Do you have a wiring diagram?
Customer: Yes and yes
JA: Anything else you want the mechanic to know before I connect you?
Customer: I don't think
Submitted: 2 months ago.
Category: Ford
Expert:  Ricardo Hohl replied 2 months ago.

Hi welcome to just answers my name is ***** ***** you back proving the ejectors when checking for power or with the connector disconnected?

Customer: replied 2 months ago.
I've tried both ways with a test light.
Customer: replied 2 months ago.
No I'm not waisting 35 on a call
Customer: replied 2 months ago.
I am getting power out of my ground wires for injectors. There can't be that many things cause it
Expert:  Ricardo Hohl replied 2 months ago.

no i am not suggesting a phone call the system does it automatically there is no need for it we can continue like this.

Customer: replied 2 months ago.
Ok thx
Expert:  Ricardo Hohl replied 2 months ago.

if you disconnect the connector from the injector and check both pins you should have one power and one ground the ground side is the one you have the problem with.

Customer: replied 2 months ago.
but like I said there power on both sides.
Expert:  Ricardo Hohl replied 2 months ago.

this is control by the computer injector driver you are right there should not be power on this pin connector if is a ground signal

Expert:  Ricardo Hohl replied 2 months ago.

the computer controls both banks signals thru 2 wires one side of injectors are control by one driver and the other by another driver so this wires can not both be shorted to power

Expert:  Ricardo Hohl replied 2 months ago.

wish leads me to believe you may have a bad computer

Customer: replied 2 months ago.
I'm getting power out of the tank/red and tan/org which both should be ground the red has power as well like it should
Expert:  Ricardo Hohl replied 2 months ago.

disconnect the computer see if the power goes out on the ground side.

Customer: replied 2 months ago.
Still have power, I can hear a click every time I touch the ground to test, coming from the distributor
Expert:  Ricardo Hohl replied 2 months ago.

if it does then this confirms a bad computer injector drive

Expert:  Ricardo Hohl replied 2 months ago.

ok let opt out and see if another expert may be able to help you .