Glow plug on when warm - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 09-19-2019, 09:23 AM Thread Starter
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Glow plug on when warm

So I think my glow plugs are coming on for the first start of the day when nights are 75*. I know this is not right but why is that happening?

I start the truck and the voltage stays low for about 30-45 seconds and then clicks up to ~14v.


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post #2 of 5 Old 09-19-2019, 10:19 AM
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Sounds normal to me. I've had a hard first start above 80F with a bad GPR before. Cheers!
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post #3 of 5 Old 09-19-2019, 01:37 PM Thread Starter
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It doesn’t hard start, I just thought they weren’t typically used until 40*. I also don’t what to wear them out prematurely if it is wrong


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post #4 of 5 Old 09-19-2019, 04:57 PM
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They are always used when you start a PSD. Guys that are concerned about wearing them out usually put them on a manual switch to activate the relay instead of having the PCM do it. Personally, I never worry about it. I've replaced the ones in my old 94 once in 250k and once in the 97 in 205k. Also when I did replace them was just because I was under the valvecovers anyway, not necessarily because they were bad. I've seen more relay problems than GP problems (OEM Motorcraft/Beru plugs). Just my opinion though. Cheers!
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post #5 of 5 Old 09-21-2019, 06:59 AM
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He is correct, the 7.3 does need the glow plugs to start even when its 80 degrees outside. I've had a couple of bad glow plugs and even in the Texas summer the truck will start and idle like it has a cam for a couple of seconds untill the dead glow plug cylinder gets some heat in it to ignite the diesel fuel.
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