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Duramax Fourth Generation: 2007.5-2010 (LMM) Discuss the fourth generation (2007.5-2010) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.


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Old 12-01-2019, 10:13 AM   #1 (permalink)
lmm2tow
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Glow plug help

Ok, need a little help. I have searched and find myself confused. What is the correct firing order of a LMM? Or more specifically, were is #2? I have a bad glow plug and the code says it is #2 but I see a couple of different diagrams.

And now for question #2, if one is bad are the rest soon to follow? Should I just replace them all?

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Old 12-01-2019, 10:33 AM   #2 (permalink)
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Originally Posted by lmm2tow View Post
Ok, need a little help. I have searched and find myself confused. What is the correct firing order of a LMM? Or more specifically, were is #2? I have a bad glow plug and the code says it is #2 but I see a couple of different diagrams.

And now for question #2, if one is bad are the rest soon to follow? Should I just replace them all?
Firing order shown here and if you replace one it would be wise to do the entire bank

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Old 12-01-2019, 04:25 PM   #3 (permalink)
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Originally Posted by lmm2tow View Post
Ok, need a little help. I have searched and find myself confused. What is the correct firing order of a LMM? Or more specifically, were is #2? I have a bad glow plug and the code says it is #2 but I see a couple of different diagrams.

And now for question #2, if one is bad are the rest soon to follow? Should I just replace them all?
Change them all right away and be sure to coat the threads to prevent getting stuck and twisting off in the head. I prefer dielectric grease on the threads and terminals.
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Old 12-02-2019, 02:47 PM   #4 (permalink)
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Well sounds like all eight it is. Wasn't what I hoped to hear as it appears there are a couple that are going to be pretty hard to get to.

Thanks guys
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Old 12-02-2019, 03:47 PM   #5 (permalink)
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I usually change mine as they go out, which in the last 10 years its only been 3 plugs some prefer to do the whole bank while they are in there ,,,,just saying whichever makes you more comfortable
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Old 12-02-2019, 05:52 PM   #6 (permalink)
Toolbox58
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I started out trying to change one at a time. Ended up changing them all, because it was a matter of weeks on each one, before the next went. They are quite a bit cheaper, if you buy a set, rather than doing one at a time.


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Old Today, 12:30 AM   #7 (permalink)
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I`ve done just one at a time as they go out. In the last 11 years, only had 3 or 4 go out but I do see the logic of doing the whole bank while youre in there especially on the drivers side.....my .02$
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