Keeping a 7.3 on "on" mode - Diesel Forum - TheDieselStop.com
1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

 
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post #1 of 3 (permalink) Old 09-09-2019, 05:40 PM Thread Starter
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Keeping a 7.3 on "on" mode

I have a 1999 f250 7.3 XLT model, can I leave it on the "on" mode where the glow plugs heat up? Will this fry my glow plugs if I do this? Thanks! Any quick response is appreciated I'm trying to tune it right now.
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post #2 of 3 (permalink) Old 09-09-2019, 06:34 PM
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If you're talking about checking things out with the key in run position, that's not a problem. The glow plugs are controlled to be on for a maximum of 2 minutes, depending on oil temperature. And that only happens when the oil is COLD. At normal daytime temps now, they're on for a much shorter time. Once the oil temp is 140F, they don't even come on.

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post #3 of 3 (permalink) Old 09-09-2019, 08:48 PM Thread Starter
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Thanks! I was putting a tune on my truck and I wanted to make sure it wasn't going to fry them while it was on the run position.
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