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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 02-14-2007, 06:04 PM   #1 (permalink)
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how often to change glow plugs?

Fairly new to the truck just curious as to how many miles or years should one go before problems?(changing glow plugs) would like to prevent a breakdown and be left sitting some where.
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Old 02-14-2007, 06:41 PM   #2 (permalink)
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Re: how often to change glow plugs?

the glowplugs won't leave you stranded, but the GPR will

i pulled the glowplugs out of a early 99 this summer it had 120,000 miles on it and they were origonal, none of them were bad

i pulled mine out witn 126,000 miles on them and didn't find any bad ones

these glowplugs are 12 volts wich makes them continuous duty once the relay clicks on it stays on, the old 6.9L-7.3L IDIs had 6 volt glow plugs wich heated up a little faster but the relay would have to cycle on and off to keep them from burning out
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Old 02-14-2007, 06:59 PM   #3 (permalink)
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Re: how often to change glow plugs?

They are not like spark plugs. Only get juice when the PCM instructs the relay to close. As mentioned the relays fail with regularity. I replaced my relay with a Stancor contactor rated to 600 amps peak and 200 amps continuous current. No problems in over about 4 years. I was on my third OEM relay in my first cold winter.
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Old 02-14-2007, 07:45 PM   #4 (permalink)
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Re: how often to change glow plugs?

[ QUOTE ]
They are not like spark plugs. Only get juice when the PCM instructs the relay to close. As mentioned the relays fail with regularity. I replaced my relay with a Stancor contactor rated to 600 amps peak and 200 amps continuous current. No problems in over about 4 years. I was on my third OEM relay in my first cold winter.

[/ QUOTE ]

Should a guy pack an extra one with them then and if so how much do they run (relays)
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Old 02-14-2007, 07:50 PM   #5 (permalink)
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Re: how often to change glow plugs?

what about the California trucks? I think they have some type of module. Why do they not put in a GPR? Is the module supposed to be better?
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Old 02-14-2007, 08:37 PM   #6 (permalink)
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Re: how often to change glow plugs?

What is the telltale sign of the GPR going bad?
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Old 02-14-2007, 10:18 PM   #7 (permalink)
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Re: how often to change glow plugs?

[ QUOTE ]
what about the California trucks? I think they have some type of module. Why do they not put in a GPR? Is the module supposed to be better?

[/ QUOTE ]
The module was for emissions. It monitors each glow plug individually and sets a code if one goes bad. Like the other guys have said, I've seen very few bad GP's. [img]/ubbthreads/images/graemlins/shrug.gif[/img]

A bad GPR will show up as hard starting in cold weather. More smoke when it does start. Might have a miss initially till the affected cylinder(s) warm up enough from the heat of compression to burn the fuel.
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Old 02-14-2007, 10:38 PM   #8 (permalink)
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Re: how often to change glow plugs?

Just wondering how many GPR's there are on my truck? I'm scheduled to have my glow plugs replaced tomorrow (on the '02 in sig.) and was wondering if it might just be a GPR. I saw two relays on the top of the engine that look like the GPR that was on my old '96 PSD...but there's two of them on this truck! How do I know if I have a bad GPR? It does smoke more than it used to on a cold morning start and idles rough for a minute or so.
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Old 02-14-2007, 11:20 PM   #9 (permalink)
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Re: how often to change glow plugs?

There are 8 glowplugs - one per cylinder.

Change them out as they go bad - I had 2 bad ones for a year - just changed them all out in DEc - and found 2 new ones bad - total of 4. Truck still started fine - little white smoke at 30F.

put a meter on the relay - also, if you just open your dooe at night and turn the key on (engine cold) you'll notice when the dome light gets brighter when the relay shuts off - (from 10 seconds to 2 minutes - but more like 20-40seconds here in Texas)
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Old 02-15-2007, 06:44 AM   #10 (permalink)
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Re: how often to change glow plugs?

as for the glow plug relay theres really no way to tell if its on its way out, one day it just won't work [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 02-15-2007, 08:11 AM   #11 (permalink)
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Re: how often to change glow plugs?

[ QUOTE ]
[ QUOTE ]
They are not like spark plugs. Only get juice when the PCM instructs the relay to close. As mentioned the relays fail with regularity. I replaced my relay with a Stancor contactor rated to 600 amps peak and 200 amps continuous current. No problems in over about 4 years. I was on my third OEM relay in my first cold winter.

[/ QUOTE ]

Should a guy pack an extra one with them then and if so how much do they run (relays)

[/ QUOTE ]Do you carry jumper cables or a large screwdriver in your truck? If so you have what you need to start in an emergency. Use the jumper cable between the two large studs on the aft most relay on the passenger side valve cover. If you are brave, you can use the screwdriver to jump the two studs but remember there are a LOT of amps going to that circuit. So it is not necessary to carry a spare GPR. Just put a good one (Stancor) in and forget about it.
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Old 02-15-2007, 10:00 AM   #12 (permalink)
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Re: how often to change glow plugs?

Is the Stancor relay different in some way from the OEM nitrogen-filled relay?

Where do I buy a Stancor relay?
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Old 02-15-2007, 10:04 AM   #13 (permalink)
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Re: how often to change glow plugs?

227k on original GP's and GPR, But then again It really doesn't get cold enough, long enough, here to have to cycle the GP's much. Plus my truck only has 1 cold start per day, and once shes up and purring then off to work we go. I do have many other starts during the day but my engine never gets cold enough for the WTS to come on for more than a few seconds.
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Old 02-15-2007, 10:14 AM   #14 (permalink)
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Re: how often to change glow plugs?

I would take that sealed and filled with nitrogen with a grain of salt. I would be willing to bet that lasts only a few hours in an automotive environment.

NCHornet bought a bunch at a REALLY cheap price and has them listed in the for sale forum. NCHornet's post Otherwise Allied Electronics, Mouser etc. carry them. Search on Stancor and you will find the links. Put one in and don't look back. There is a pic of it mounted in my gallery. The Stancor is huge. Kanman's pic of the Stancor vs. GPR 109



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Old 02-15-2007, 11:36 AM   #15 (permalink)
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Re: how often to change glow plugs?

Does the Stancor mount to the OEM relay mounts, or did you have to devise your own mounting method?
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