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Glow plug question

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Old Oct 11, 2017 | 07:48 PM
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1993 ford
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Glow plug question

Hello I have a 1993 Ford F-250 with a 7.3 non-turbo. I have replaced all 8 glow plugs with motorcraft ones. After my truck sits for a hour or so the glow plugs don't cycle and I think they should because it takes a while to start. If it sits over night or for a extended period of time they work like they should. Is there a temperature sensor I should look at? I know my temperature gauge isn't reading right should I try and change that sensor? What do you guys think? Thanks
 
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Old Oct 11, 2017 | 09:28 PM
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ihateminimumwage
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It's does sound like an issue with the glow plug controller that is threaded into the cooling system not recognizing a cooldown.

Of the two temp senders, one goes to the gauge, and one to the warning light. They don't have any say in GP function.

I wish I could be more help troubleshooting, but I switched over to a manual push button GP control years back, as I got tired of the cycling after the initial start.
 
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Old Oct 12, 2017 | 05:26 AM
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tjc transport
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glow plugs turn off once the engine reaches around 110 degrees.
they will not start working again until the engine is under around that 110 degrees mark.
 
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