How Long do the Glow Plugs last? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 11-05-2007, 08:05 AM   #1 (permalink)
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How Long do the Glow Plugs last?

With the colder weather approaching, and the fact that my truck will be 8 years old.
I am becoming concerned that it may be time to replace the glow plugs in my truck.
So far the coldest days have only been in the upper 30's and the truck starts fine.
It has 86,000 miles on it, which is not much for 8 years.

While the truck was fairly new the GP relay was replaced under warranty, and the replacement has lasted much longer then the original.

But should I replace the GP's and GPR as maintenance item?

Has any one done a step by step pictorial on Glow Plug Replacement?

Thanks for any coments

Phil
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Old 11-05-2007, 08:31 AM   #2 (permalink)
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Re: How Long do the Glow Plugs last?

My truck has 203k on the clock and I'm still using the original GPR. I just replaced one Glow plug a month ago as I was repairing a UVCH issue. GPR like most relays are effected by cycles used and are really harmed by low voltage which will increase the amperage across the contacts inside and cause pitting. My truck is 9 years old and I replace the batteries for the first time 3 years ago.
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Old 11-05-2007, 08:53 AM   #3 (permalink)
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Re: How Long do the Glow Plugs last?

Don't even think about them until you start seeing a puff of white smoke on start-up. Then, you can pull the UVC connector and ohm out the GPs to find the bad ones. I tested mine a couple years ago and found 2 bad ones. Drove it like that for a year no problems. Then finally did the UVC and GPs and found that four were bad.

Of course that is in Texas....but the GPs are a cold starting aid. Above 40-50 they don't even come on that long and are likely for emissions only - and they never come on when the oil temp is above 130F. So just keep an eye on the exhaust during starting and then you can test for bad ones when you have them suspect.
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Old 11-06-2007, 06:27 PM   #4 (permalink)
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Re: How Long do the Glow Plugs last?

I lost #8 at 37K in an 01 last month
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Old 11-06-2007, 06:42 PM   #5 (permalink)
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Re: How Long do the Glow Plugs last?

They can be a real booger to get out if they have high mileage on them. I have seen them break off in the head which requires the head to be removed to extract the broken glow plug. As cheap as they are for a set of 8, just replace them if you have your valve covers off or changing injectors.
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Old 11-06-2007, 08:22 PM   #6 (permalink)
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Re: How Long do the Glow Plugs last?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Deputydog</div><div class="ubbcode-body">They can be a real booger to get out if they have high mileage on them. I have seen them break off in the head which requires the head to be removed to extract the broken glow plug. As cheap as they are for a set of 8, just replace them if you have your valve covers off or changing injectors. </div></div>
Very true, I just ordered eight of them because I have the valve cover off, they were $11.50 each though Pensacola diesel, found them on ebay when I needed to order injectors. Don't know if that is the cheapest for a glow plug, but it was cheap enough for me. Ther remaned injectors are $99 each free shipping, that was the cheapest I could find.
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Old 11-19-2007, 04:51 PM   #7 (permalink)
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Re: How Long do the Glow Plugs last?

How do you check the glow plugs. Isn't there a way to OHM them without removing the valve covers.


Thanks,
Brian
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Old 11-19-2007, 05:13 PM   #8 (permalink)
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Re: How Long do the Glow Plugs last?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Deezle_Dog</div><div class="ubbcode-body">How do you check the glow plugs. Isn't there a way to OHM them without removing the valve covers.


Thanks,
Brian </div></div>

Sure, look Here
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Old 11-19-2007, 06:48 PM   #9 (permalink)
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Re: How Long do the Glow Plugs last?

Thanks, that is what I was looking for.
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Old 11-20-2007, 01:33 PM   #10 (permalink)
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Re: How Long do the Glow Plugs last?

Glow Plugs are simple resistive elements. Ohm's law states I = V/R. Therefore, with R constant, current will actually decrease with a drop in voltage.

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