What year LMM Duramax is best?
The best Duramax diesel engine year models that are safe to buy include:
- 2010 – 2017 Duramax LGH.
- 2011 – 2016 Duramax LML.
- 2011 – 2021 Duramax XLD25.
- 2012 – 2021 Duramax XLD28.
- 2014 – 2021 Duramax LWN.
- 2017 – 2021 Duramax L5P.
- 2019 – 2021 Duramax LM2.
Is the lp5 Duramax a good engine?
The L5P is considered the most reliable post-emissions Duramax made to date. With the removal of the CP4. 2 fuel injection pump and various improvements made to the block, pistons, and other internals, the engine itself is extremely capable and reliable.
How much power can a LMM Duramax handle?
DANGER ZONE: 550 to 600-rwhp The I-beam style connecting rod found in the LBZ and LMM engines is said to be capable of handling 50 to 100 more hp than the stock rods found in the LB7 or LLY.
What problems do LMM Duramax have?
Other Duramax LLY problems included the following:
- Head gasket failure.
- Injector harness chafing.
- Water pump failure.
- EGR valve issues.
- Glow plug failure.
- Fuel pressure relief valve.
- Lack of factory lift pump.
How much horsepower can an Allison 1000 handle?
Allison 1000, Six-Speed (‘07.5-’10) By the time the LMM-powered GMs hit the market, aftermarket tuning of the TCM had progressed enough to where the Allison could withstand 430 to 450-rwhp for extended periods of time—and 500-rwhp on occasion.
How much boost does a LMM Duramax have?
32psi max for reliability.
How often does an LMM Regen?
However, the fuel required to perform an active regeneration cycle (which occurs about once every fillup or roughly every 400 miles traveled) is the primary reason why the LMM-powered trucks took a hit in fuel economy.
How long will an LMM Duramax last?
If you want to know how long a Duramax engine will run, you should expect it to last as much as 300,000 miles before needing any major repairs. But, of course, this number can vary depending on how well the engine was maintained and driven throughout its life.
What does Duramax LMM mean?
The LMM Duramax refers to Chevrolet Silverado HD and GM Sierra HD trucks equipped with the 6.6L Duramax diesel engine between the years of 2007.5-2010. It was very similar to the LBZ, but it featured an all-new emissions device, a diesel particulate filter.
How much boost can a stock LMM handle?
The LMM turbo will handle right around 38 or so without issue.
Is the p0674 cylinder 4 glow plug circuit any good?
I got the P0674 for the Cylinder 4 Glow Plug Circuit. It was 32 this morning and she starts and runs absolutely great. Any thoughts would be appreciated. Clear it and see if it returns. There is no roughness when first started when it is 30’s or below (like this morning)?
What are the symptoms of a p0674 engine code?
The code is the main way of identifying such a problem. The engine management computer (PCM) will set the code P0674 The engine will be hard to start or may not start at all in cold weather or when its been sitting long enough for the block to cool. Lack of power until the engine heats up sufficiently.
How do you tune a Duramax LMM?
There are a few options for tuning the LMM. You can either buy a handheld flash tuner like an SCT or Edge device, or you can get custom tuning with something like EFI Live. EFI Live is probably the most powerful tuning software for Duramax engines.