LMM Duramax Glow Plugs

LMM glow plug control module

We know that even though glow plugs are not mandatory for your vehicle’s engine to start up, they play quite a role in cold weather. Now they seem a bit more important, don’t they? The LMM Duramax engine will need eight glow plugs to work properly as a unit. But who will control them?

We have the glow plug control module or the glow plug controller for this particular task. The glow plug control module or controller will control how much heat the glow plugs will produce, when or how the glow plugs will become active, which one will be up to the task, how much current will flow to each glow plug, etc.

LMM Duramax Glow Plugs

So, the glow plug controller is as important as the glow plugs. Because without the module, the engine won’t be able to use the glow plugs. That is why a damaged or wore out glow plug control module is not a nice thing to have in your vehicle. Especially in the cold weather.

What do you do then? You need to change the glow plug control module with an aftermarket one. You will know about a damaged control module by mainly error codes that refer to glow plug-related problems.

Check the glow plug control module of your LMM Duramax if you see the symptoms. After the confirmation, go for the replacement. You will need around $250 for the control module alone. And save some extra for the labor cost.

LMM glow plug order

Knowing the order of the glow plugs or their location is very important if you want to replace them. Because if you don’t, you will face trouble replacing them. Chances are you might replace the wrong one. In order to know the glow plug order, you need to know the location of the cylinders.

As there is one glow plug for every cylinder, you will know the location of the glow plugs if you know the location of the cylinders.  The cylinders are in such a location, it is very easy to locate them and remember their location. 1, 3, 5, 7 number cylinders are at the passenger side. And 2, 4, 6, 8 number cylinders are at the driver’s side.

That means the even number cylinders are on the driver side and odd number cylinders are on the passenger side. And for your information, the firing order of the cylinders is 1-2-7-8-4-5-6-3.

Duramax glow plug location

Knowing the location of the glow plugs is very important in case of any replacement. The location of glow plugs on Duramax is very common. If you can get to the cylinders, you can get to the glow plugs too.

duramax glow plug location

Basically, you can find the glow plugs of Duramax engines if you remove the wheel fender liners. The odd number of glow plugs are on the passenger side and the even numbers are on the driver side. Try to go for the passenger side at first as this side’s glow plugs are easier to get to. And then go for the driver-side glow plugs if there is any problem or for the sake of any diagnosis.

Duramax glow plug location diagram

Duramax Glow Plug Location Diagram

It might be hard for you to find out the location of the glow plugs by just reading information. It will be better if you can visualize the location with a picture or a diagram. Watching a video will be more useful. We are attaching a diagram here to help you visualize the location of the glow plugs better.

2011 Duramax glow plug diagram

In 2011, there were three running Duramax engines. They were LGH, LML, and XLD25. That is why it is quite tough to know the correct information about 2011 Duramax engines. You have to be more specific in this regard.

For instance, XLD25 is not even a V8 engine. It is an I-4 engine. Anyway, we are attaching a diagram in this section so that you can visualize the location of glow plugs of 2011 Duramax engines in a better way. The glow plugs shown in the diagram are the passenger side glow plugs.

Duramax glow plug replacement cost

The actual cost of glow plug replacement varies. It depends on various factors. The location, vehicle model, and the shop. It also depends on either you want to do it on your own or by a mechanic. 

You will need around $12-$20 for a new glow plug. If you want to replace all eight glow plugs of your Duramax engine, you will need around $100-$160. And the labor cost will be in between the range of $100 to $200. To sum up, you will need around $200 to $360 for a full set glow plug replacement. 

changing Duramax lmm glow plug replacement

LBZ glow plug part number  

The part number of an LBZ Duramax glow plug is #97364968. You may also see the part number as GM Part #97364968 and it is 61G. 

Are you ready to replace your Duramax glow plugs for LB7 Chevy / GMC Duramax

lmm Duramax glow plug torque spec

LMM Torque Specs

LMM Aftermarket Fastener Torque Specs
Glow Plug13 lb ft
Glow Plug Controller Bolt89 lb in
Glow Plug Harness Bracket Bolt89 lb in
Glow Plug Nut18 lb in

FAQ

Does an LMM have glow plugs?

Yes. LMM Duramax uses glow plugs. It does not use spark plugs as it is a diesel engine. You need to use glow plugs instead of spark plugs because the starting process of a diesel engine and a gas engine is totally different. As a V8 engine, LMM Duramax needs eight glow plugs to work properly as a unit. 

How long do glow plugs last Duramax?

You can expect a rough number of around 100,000 miles. The glow plugs may last longer or shorter depending on your driving habit. However, it is not mandatory for you to change them before every 100,000 miles. Because they are totally different from the likes of spark plugs. You can let them stay as long as you don’t see any symptoms of a glow plug failure. 

What are the symptoms of glow plug failure?

The most common symptoms of a glow plug failure are-

  • Rough idling
  • Misfire from engine
  • Bad fuel efficiency 
  • Hard starting
  • Black smoke
  • White smoke

 Where is the number 1 glow plug on Duramax? 

The number 1 glow plug is on the passenger side of the vehicle. Number 1, 3, 5, 7 are on the passenger side. That means the odd number of glow plugs are on the passenger side. You can reach there either by removing the fender liners or from the top. 

Where is the number 2 glow plug on Duramax?

The number 2 glow plug is on the driver’s side if the engine is Duramax. Basically, 2, 4, 6, 8 number glow plugs are on the driver side. So, we can tell all the even number glow plugs are at the driver’s side of the vehicle. 

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