preferred glowplug brand?
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Logistics Pro
Joined: Jul 2004
Posts: 4,859
Likes: 55
From: Middleville, MI
preferred glowplug brand?
searched this and 10 pages into the results i didn't find a brand mentioned so i'm throwing it out there. is there a preferred brand of glowplug? battled cold starting issues all last winter (https://www.ford-trucks.com/forums/1...out-codes.html) and now that i've procrastinated all summer i wanna get it taken care of before it gets cold out.
(FYI on some of the codes, i have an EGR delete and the bottom three codes are a result of me not properly running one of the diagnostic tests
)
(FYI on some of the codes, i have an EGR delete and the bottom three codes are a result of me not properly running one of the diagnostic tests
)
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Might want to check power to and from GPCM. All eight bad looks suspicious. There is a fusible link in the harness near the passenger side battery. I just snag gp's from the dealer not too expensive, but then again, I haven't done 8 at a time before. You can check gp's with a meter using this:
It looks like the GPCM is really 2 units in one box.
Glow plug to ground 0.1~2 Ohms
Glow plug connector to GPCM connector Less that 5 Ohms
Pin #3 on both is the VBattery
Green connector
pin #1 is gp#5
pin #2 is gp#7
pin #6 is gp#1
pin #7 is gp#3
pin 8 goes to the PCM
pin 9 goes to the PCM
Black connector
pin #1 is gp#6
pin #2 is gp#8
pin #6 is gp#2
pin #7 is gp#4
pin 9 goes to the VPwr
It looks like the GPCM is really 2 units in one box.
Glow plug to ground 0.1~2 Ohms
Glow plug connector to GPCM connector Less that 5 Ohms
Pin #3 on both is the VBattery
Green connector
pin #1 is gp#5
pin #2 is gp#7
pin #6 is gp#1
pin #7 is gp#3
pin 8 goes to the PCM
pin 9 goes to the PCM
Black connector
pin #1 is gp#6
pin #2 is gp#8
pin #6 is gp#2
pin #7 is gp#4
pin 9 goes to the VPwr
Thread Starter
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Logistics Pro
Joined: Jul 2004
Posts: 4,859
Likes: 55
From: Middleville, MI
well, it's "only" six of them haha. going to ohm the harnesses tonight just to see though, thanks.
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Logistics Pro
Joined: Jul 2004
Posts: 4,859
Likes: 55
From: Middleville, MI
that's what i suspect actually. could be an interesting fall if i don't get them fixed stat, as i think i'm dealing with a bleeding-down HPOP now too, ha.
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Logistics Pro
Joined: Jul 2004
Posts: 4,859
Likes: 55
From: Middleville, MI
You can check gp's with a meter using this: It looks like the GPCM is really 2 units in one box. Glow plug to ground 0.1~2 Ohms Glow plug connector to GPCM connector Less that 5 Ohms Pin #3 on both is the VBattery
Green connector
pin #1 is gp#5
pin #2 is gp#7
pin #6 is gp#1
pin #7 is gp#3
pin 8 goes to the PCM
pin 9 goes to the PCM
Black connector
pin #1 is gp#6
pin #2 is gp#8
pin #6 is gp#2
pin #7 is gp#4
pin 9 goes to the VPwr
Green connector
pin #1 is gp#5
pin #2 is gp#7
pin #6 is gp#1
pin #7 is gp#3
pin 8 goes to the PCM
pin 9 goes to the PCM
Black connector
pin #1 is gp#6
pin #2 is gp#8
pin #6 is gp#2
pin #7 is gp#4
pin 9 goes to the VPwr
gp1 - 217 ohm
gp2 - 2 ohm
gp3 - 2 ohm
gp4 - 495 ohm
gp5 - open loop
gp6 - 2 ohm
gp7 - open loop
gp8 - 7 ohm
could 5 and 7 have fully failed or is it more likely the harness has failed?
my original glow plug brand question still stands as well, haha.
Elder User
Joined: Sep 2012
Posts: 776
Likes: 3
From: Philly, PA USA
IMO, more than likely on the harness side... I can see 1 maybe 2 going bad... but I found that on the 6.0 it's quite rare
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Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
I've changed 5or6 now (two no my own truck) and only 1 was "open". It looks like the two that ares not failing are on the verge of crappin out. It looks like the 5ohm figure I posted above is for the harness so you could wring those out also. It very easy to break the connector at the GP, you may end up needing the harness(s) anyway. 
As I posted above, I get mine from the dealership parts counter ($12-14iirc) but someone here may have a better idea. I think I would buy 8 in your situation.
Note that the 0.1 to 2.0 ohm for the GP's are JUST the plug not the plug and harness.
As I posted above, I get mine from the dealership parts counter ($12-14iirc) but someone here may have a better idea. I think I would buy 8 in your situation.
Note that the 0.1 to 2.0 ohm for the GP's are JUST the plug not the plug and harness.
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Posting Guru
Joined: Jun 2006
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It depends on your build date. After 9/22/03 and you need the
2004 Motorcraft Glowplugs $9.25 at Dieselfilters.com
While you are there, grab you some filters!
Motorcraft Oil Filter is $17.36
Racor Fuel Filter $35
Check the prices, see what you need! $43 for GP harness there too.
2004 Motorcraft Glowplugs $9.25 at Dieselfilters.com
While you are there, grab you some filters!
Motorcraft Oil Filter is $17.36
Racor Fuel Filter $35
Check the prices, see what you need! $43 for GP harness there too.
Fleet Owner
Joined: Nov 2003
Posts: 27,931
Likes: 3,653
I have had acceptable service life from the Motorcraft glow plugs. Replace the harness also (like everyone else is saying) - unless it is fairly new already.
As 99Expy is steering you ........ be sure to get the proper glow plug
In 2004, the piston was modified (updated bowl design). Due to the design change of the piston, the glow plug has been made shorter by 1.2 mm. If the longer glow plugs are installed into an engine with updated pistons, glow plug to piston contact will result, ending in potential engine failure.
As 99Expy is steering you ........ be sure to get the proper glow plug
In 2004, the piston was modified (updated bowl design). Due to the design change of the piston, the glow plug has been made shorter by 1.2 mm. If the longer glow plugs are installed into an engine with updated pistons, glow plug to piston contact will result, ending in potential engine failure.
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Logistics Pro
Joined: Jul 2004
Posts: 4,859
Likes: 55
From: Middleville, MI
thanks guys. i did see the change in '04 plugs info in my search, but looks like Motorcraft parts win again (no surprise i suppose). last year when i was looking into all this i saw a demonstration video for some other glow plug that powered three brands at once next to each other and one heated far and above faster and hotter, couldn't remember which it was.. i know it was aftermarket. just a thought.
Thread Starter
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Logistics Pro
Joined: Jul 2004
Posts: 4,859
Likes: 55
From: Middleville, MI
reading through the comments it looks like everyone debunked what turned out to be a sales pitch haha. motorcraft it is.
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