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Old 12-18-2013, 03:18 PM
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Odd glow plug issue

Alright I have a 94.5 F250 that has some serious glow plug issues. First off I have 8 new ZD-11 plugs in it with a stancor relay. My issue isnt the glow plugs them selves but the control of them. I cant get the relay to turn on without having a manual switch for the ground out off the relay. Yes it works but it drives me nuts. I have 12v into the relay from

I have been referencing these two diagrams to figure it out





Here is where it gets tricky. I know I have a good engine oil temp reading as its a new sensor. I have also replaced the BARO with a known good one (still unclear as to what the readings should be on that but came from a working truck). I have continuity through the grounding wire from the relay to pin 101 on the computer. Even tried a new wire with no luck. I have tried 3 different computers with no luck either. I am to the point that I wonder if its just never going to work.

Anyone have any input on this at all????
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Old 12-19-2013, 02:48 PM
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I would probe pin 101 on keyon to check for ground. If ground is good, check the other side of the coil for power. Good power, then it's time to check resistance of the relay. The PCM can only sink so much current. It's possible that your coil in the relay is partially shorted and trying to flow too much current when the PCM grounds pin 101. The PCM should have protections to shorts that would fry the PCM. That's where I would start. You may also have slightly burned GP relay contacts. When you switch ground the coil for the relay you're probably flowing more current than the PCM allows, which may allow increased switch activation (pushing the contact harder and through the burns on the contact).
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Old 12-19-2013, 02:51 PM
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I got it all figured out, I had multiple issues
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Old 12-19-2013, 02:52 PM
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Care to share for the next person?
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Old 12-19-2013, 03:08 PM
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If the next person has to replace what I did they will be pissed lol

I replaced the wiring to the glow plug relay, the baro sensor, my computer.
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