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Glow plug problem.
, 2002 7.3, wasn't starting unless…

Customer Question
***** *****, glow plug...

***** *****, glow plug problem.

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

2002 7.3, wasn't starting unless plugged in, found bad gp relay, changed it, still not energizing the gp side, got power from batt to big post, and power on both little terminals, when i turn the key on the wire from cpm is not cutting the circuit to energize the relay, I took cpm wire of and grounded it and that energized the relay, same for the aih

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Submitted: 2 years ago.Category: Ford
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Answered in 22 minutes by:
1/17/2016
Ford Mechanic: James, Ford Technician replied 2 years ago
James
James, Ford Technician
Category: Ford
Satisfied Customers: 3,634
Experience: Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
Verified

Hello, so when you ground the small post on the glow plug relay it energizes and the vehicle will start?

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Customer reply replied 2 years ago
didn't get that far, batteries died, it will start after plugged in.
Customer reply replied 2 years ago
pcm has power, truck runs fine, even disconnected the eot to see if that would energize the relay, it didn't. its 30 and snowing here.
Customer reply replied 2 years ago
by energize, i mean create a ground.
Customer reply replied 2 years ago
would low batteries tell the pcm not to energize the gpr?
Customer reply replied 2 years ago
after charging the batteries, I created a ground and it started and looped and died, i did change the right side glow plugs, so have are new.
Ford Mechanic: James, Ford Technician replied 2 years ago

Each glow plug tested with an ohm meter to ground should be between .5-1.9ohms. If grounding the glow plug relay energized it and it started this is a bad ground inside the PCM itself. The repair for that will be to replace the PCM or run a manual switch to control the glow plug relay. If you energized it you should keep it energized for at least 45sec before attempting to start.

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Customer reply replied 2 years ago
to fix it, i would have to change the pcm?
Ford Mechanic: James, Ford Technician replied 2 years ago

Correct if the ground driver in the PCM is bad. Replacing the PCM is the correct repair. If you wanted an inexpensive repair you could wire the small post to a switch inside the vehicle. Run the switch to ground you can manually control the glow plugs.

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Ford Mechanic: James, Ford Technician replied 2 years ago

Hello, can I still offer you assistance? If not please remember to rate my answer so I receive credit for assisting you.

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Customer reply replied 2 years ago
Your good, was hoping there was another answer, I wired a manual switch through a relay.
Ford Mechanic: James, Ford Technician replied 2 years ago

Wiring a switch is the route I have gone for many customers when this happens.

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