Glow Plug fun today!!! - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 35 (permalink) Old 01-15-2020, 09:07 PM Thread Starter
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Unhappy Glow Plug fun today!!!

So, my crew cab dually that I purchased brand new in 05 threw a code that the #2 glow plug was dead so today I went out to replace it. Used penetrating oil as recommended and it came out fairly easily. The new Autolite glow plug however took a bit of persuasion to get in to where the threads would pull it in. After installing it I noticed while trying to get the retainer nut back on the electrical lead that there was a tiny bit of motion and that scared me so I pulled it back out to use another new glow plug only the electrode stuck in the head. Now it looks like the entire top end of the motor is coming off to freshen it with only 147K miles on it. Breaks my heart but I don't know what else I could do. Am I just the lucky one or what?
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post #2 of 35 (permalink) Old 01-15-2020, 09:26 PM
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There are extractor tools to deal with a GP.

Your big mistake though, is using a Fjord part on your Dmax.

ONLY install acDelco GPs....as the others won't play nice in your Dmax.

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post #3 of 35 (permalink) Old 01-15-2020, 09:45 PM Thread Starter
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Quote:
Originally Posted by Hook'em_Horns! View Post
There are extractor tools to deal with a GP.

Your big mistake though, is using a Fjord part on your Dmax.

ONLY install acDelco GPs....as the others won't play nice in your Dmax.
I suppose we live and learn - the hard way, all too often. We use Autolite plugs in our GM powered drag cars and have had nothing but great luck with them. OK, ACDelco for me!
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post #4 of 35 (permalink) Old 01-15-2020, 10:00 PM
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mainly it's a voltage/amp issue that doesn't jive.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab
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post #5 of 35 (permalink) Old 01-15-2020, 10:00 PM
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And replace all of them at the same time.

2008 Silverado 2500 Crew Cab Z71
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post #6 of 35 (permalink) Old 01-15-2020, 11:11 PM Thread Starter
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Originally Posted by GoBlowSnow View Post
And replace all of them at the same time.
I've already purchased eight new AC Delco 63G Glow Plugs for the top-end rebuild that this truck is headed for. Sadly, this truck has been perfect since new and I really hate to tear it down like I have to to get the rotten stuck electrode out! Well, I'll do the valves all fresh/new and hope it always runs as good as it did yesterday.
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post #7 of 35 (permalink) Old 01-16-2020, 05:35 AM
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Originally Posted by GoBlowSnow View Post
And replace all of them at the same time.
My experience is different, Ive replaced only 2 that failed and the rest are doing fine. The GPs are not like spark plugs in a gasser, they work only for a short period of time each cold start.

I would recommend that while you are in there remove all 4 on that side and put some good thread anti seize (I like Kopr-Kote) so the threads will not seize later.

and if you cannot get the GP out even with the extractor you can put a 3.5 ohm on the end of the GP lead and ground it. This will trick the GPCM into thinking the GP is there and working. MUCH less cheaper and quicker than a head removal.

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Last edited by 407driver; 01-16-2020 at 05:39 AM.
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post #8 of 35 (permalink) Old 01-16-2020, 06:40 AM
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If all of the body of the glow plug came out, and its just the tip of the plug left in there, take it out and run it hard for a couple pulls, get the cylinder pressures up a bit and see if it will push it out. When I worked at our local GMC dealer, we had an LBZ that had a tip broken off and lodged in the head. Our service manager at the time said 'lets go out back and force this thing out' and a couple good hard pulls later on the back road, the engine had a huge compression leak-blew the tip out and all was good. Its worth a shot at least

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post #9 of 35 (permalink) Old 01-16-2020, 10:18 AM Thread Starter
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I've already resolved to do the entire top end. Gasket sets are ordered and new parts, as necessary will be ready for this. Only 147K on this engine but I suspect it would react well to a valve job, new injectors and freshened parts. I love this truck and won't risk this glow plug getting in that combustion chamber where a complete rebuild is required.

I really do appreciate the feedback. I love going to a knowledge center like Duramax Diesel Forum.
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post #10 of 35 (permalink) Old 01-16-2020, 10:40 AM
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Originally Posted by The Doctor View Post
The new Autolite glow plug however took a bit of persuasion to get in to where the threads would pull it in.
This is where you screwed up. When dealing with the glowplugs.... NEVER force anything.
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