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3.0 Duramax Melted Piston / GM Tech Perspective on Likely Cause

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I bought a Piston from the popular video that "I Do Cars" did on the 3.0 Duramax Diesel. I talk about the history of the vehicle and my opinion as to what caused it. The bulletin mentioned in the video is located below as well as the article I found that talked about tuning.
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www.bankspower.com/demonworks
Banks iDash Data Monster - 66760
Banks iDash Super Gauge - 66562 (piggyback kit to datamonster)
Banks Pedal Monster Kit - 64311 (piggyback kit to datamonster)
Banks Stealth Pod Single - 63369
Banks Stealth Pod Dual - 63370
TUNER INFO: NOT AFFILIATED OR THE CAUSE OF THIS PISTON ISSUE- JUST AN ARTICLE DISCUSSING TUNING : drperformancer...
NHTSA BULELTIN: static.nhtsa.g...
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Опубликовано:

5 сен 2024

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Комментарии : 90

@scrappy7571 Месяц назад

Here at the dealer... Anytime we get internal engine problems, we have to send GM the ECM/PCM files. They check to see if programing has been changed. They can also tell if it was changed back to stock. We have denied warranty on many vehicles because of this. You wanna play, you gotta pay when it breaks. We also get a lot of diesels with DEF in the fuel system, another thing not covered is stupidity.

@DemonWorks Месяц назад

Same thing I said in one of my responses here. “If a vehicle needs an engine under warranty, we are required to pull the calibration history and current calibrations, screenshot then send to gm for approval. They then make the call. If a calibration is sent in that fails, it will show up on the warranty information almost immediately after confirmed its aftermarket.”

@4961Studebaker Месяц назад

Just watched Eric’s video the other night. Glad you watched and commented on it.

@DemonWorks Месяц назад

Awesome! Thank you!

@chriswilliams4316 Месяц назад

Thanks for commenting on this demon. Lots of misinformation runs rampant when one of those videos gets posted. Nice to hear a logical explanation from someone very familiar with these engines.

@DemonWorks Месяц назад

Thanks for the kind words !

@garycotton Месяц назад

Thanks. I, too, was wondering why and what if. I think I'll stick with my old motto concerning my truck. " If it ain't broke, don't fix it"

@DaBelch Месяц назад

Just found your channel, I have 99,400 on my LM2 and love it. It’s had some issues. Coolant control valve, cylinder 6 glow plug/connector AND chaffed harness, and auxiliary coolant pump. But still absolutely love this truck. Excited to learn how to work on it through you!

@clintgriffith8479 Месяц назад

Where is the harness chaffed? Wondering if it’s a preventable issue with wire routing/shielding

@DaBelch Месяц назад

@@clintgriffith8479 they told me it was where the main engine harness collects and turns toward the driver side wheelwell. $1k for the repair.

@clintgriffith8479 Месяц назад

@@DaBelch Thanks for the reply! Gonna check this weekend and see if It’s a preventable issue with mine as well.

@adambarras6566 Месяц назад

I would love to know who the tuner was. Only a handfull of tuners out there.

@impala-wf2sd Месяц назад

Just hit 60k on my 3.0.... zero issues

@karlschauff7989 Месяц назад

Just saw a guy on the 3.0 Dmax group on FB show his LM2 with like 210k miles. Loved it so much he got another one.

@shutupdog11 Месяц назад

Mee too !!🎉

@techs1smh13 Месяц назад

I live in so ca own a 2500 hd duramax now empty nest no more toy box moving to America..... really like the 3.0 DMAX .

@keithm7087 Месяц назад

Logic says that if you are not happy with the factory power output of your engine, you bought the wrong vehicle.

@hochhaul Месяц назад

You see it on the Facebook lm2 groups from time to time. Guys that tow a 10k trailer for work and want to downsize to a 1/2-ton diesel for the fuel economy. These a great trucks but pulling 10k lbs every single day... I wouldn't do that with any half-ton. But I would put mo ey on it that some guys will do it, wish they had a bit more power like their old truck had, and go cheap with something like the AG Diesel module that boosts rail pressure.

@adambarras6566 Месяц назад

I've never been satisfied with the power of any of my 16 vehicles I've owned lol. Have not yet tuned my refresh LM2 bc there's not enough feedback or competitive tuners out there yet but I had over 200k miles on a gde tuned and deleted ecodiesel. A good tune will increase longevity in my experience

@slocavky Месяц назад

Glad you did this video. I seen the I do cars video when it came out and when I seen the pistons I instantly knew it was a tune issue. NOT from gasoline. Why do you think GM denied warranty....

@DemonWorks Месяц назад

I don't think there was ever an attempt at warranty. I think the owner knew the situation and it went out of pocket right from the beginning.

@craighoffman6876 Месяц назад

6:00 - Ya, add in simple "tuners" that fool the system into injecting extra fuel are junk. They likely aren't detectible if removed though, as the ECM wasn't flashed. A reputable tune that entails flashing the ECM is better, but illegal in the US and really not necessary as the 3.0 runs really great right out of the box. I wouldn't risk tuning and losing warranty on an expensive vehicle.

@rodgood Месяц назад

If a power tune only hurt the centre pistons ,why was a Gasoline dilution ruled out ?

@DemonWorks Месяц назад

It’s just my assumption, I feel there would be other signs. one of which is clean pistons and I believe we would have seen other symptoms of detonation rather than melting. Detonation would come first and I would think there would be signs of that, including pistons cracking. I could be incorrect though.

@fireflyraven2760 Месяц назад

God damn eric tears down an engine and this guy is turning heads throughout the auto community

@HerrimanB14 Месяц назад

If this is a common rail engine wouldn’t injection pump timing be irrelevant beings the rail feeding the injectors would always have the same psi. I do see how advancing/retarding the timing of the actual fuel injector and fuel pressures could cause this and generally agree it was probably a plug in device that caused the failure. The only question I have is why did it only affect a few holes? It was hot enough/ enough pressure to completely melt through one of the pistons and severely damage others, it’s odd that a couple pistons were basically unscathed .

@DemonWorks Месяц назад

correct, injection pump timing is irrelevant. I mentioned that because the teardown video, Eric mentioned it as a possible cause.

@hahaadventures4838 Месяц назад

So does GM scan the ECM as well to prove programming was done to turn up the power? Just denying warranty based on a visual inspection seems like an incomplete investigation.

@DemonWorks Месяц назад

If a vehicle needs an engine under warranty, we are required to pull the calibration history and current calibrations, screenshot then send to gm for approval. They then make the call. If a calibration is sent in that fails, it will show up on the warranty information almost immediately after confirmed it's aftermarket.

@born2push Месяц назад

If instar can sell our info why can't they report if no maintenance item resets?

@DemonWorks Месяц назад

good point

@highball7347 Месяц назад

Any diesel could come from the factory with 2000hp and 3000 lb ft of torque and some idiot would be looking for a tune the moment he signs for the vehicle.

@DemonWorks Месяц назад

'Merica !

@keithfreeman439 Месяц назад

@DemonWorks did you know, that if you google translate 'merica! it's 'PEPPER!

@dallincauchi2562 Месяц назад

Crazy but the lz0 come with upgraded pistons

@Farmerboy4630 Месяц назад

My truck is a 2021 lm2 stock and I farm on the side I have it towing all the time it has about 110,000 on it. It doesn’t use any oil till your over on a oil change the def temp sensor went out and I’ve had a bad oil sample on it also seems to have blow by or high crankcase pressure but it starts sound runs great probably cranks half as long as my buddy’s truck with about 40,000 on it @demon works would you be willing to look at the oil sample

@DemonWorks Месяц назад

If you already got a sample done, yes, you can send the image of the paper to me if you want mstrgoodrench@gmail.com I wouldn't worry about blowby, as the trucks have a large amount of steam/crankcase gases when the oil cap is removed, just the nature of the beast. Obviously, it could be real bad, then it's not normal. Just wanted to point out that they all do have blowby signs.

@adamaloisio8805 Месяц назад

Do you consider these piggy back devices that manipulate fuel pressure and maf signals to gain power a "tuner"? They claim to not leave any traces on ecm and there is not "tuning" involved.

@DemonWorks Месяц назад

I use the "tuner" word loosely for piggy back as well, even though they are not doing any tuning. People like the piggyback to fool warranty when issues arise, but melted pistons would be a red flag and gm could deny coverage. In addition, the transmission does read how much power has been sent to it as well as the engine being able to calculate hp/tq.

@adamaloisio8805 Месяц назад

@DemonWorks fair enough. I have a 2024 lzo and I honestly looked at one system In particular but again I'm under full factory warranty and was curious as to how they could reasonably deny a claim without the ecm being manipulated. I'm not saying I will or won't add one lol but I am nervous. I was definitely the warranty on most of my fullsized diesels in the past so i know the price to pay for more power huh huh huh huh (tim the tool man taylor grunt haha)

@FullaBullz Месяц назад

As always great video man.

@markpontes4457 Месяц назад

Obviously if wasn't covered it was a stunner because who would pay for repairs on a leased vehicle! And the owner knew it wasn't going to be covered because there's no record of them even trying to get it covered! They just wanted to fix it cheap and be able to turn it in on the lease without getting charged For the damage or a brand new engine from gm!

@markharris7723 Месяц назад

anyone having oil consumption issues with their LZO ? I was hoping mine would stop or at least decrease after ten thousand miles or so, but im at 14,000 now and i think it has gotten worse. I LOVE the engine and DW has taught us a lot about them I normally wouldnt know.

@fernandobarragan3330 Месяц назад

I have a 2023 silverado with the 3.0 LZ0 and it is consuming two quarts of oil between oil changes, the truck currently has 22,000 miles. I took it to my local chevy dealer they performed a consumption oil test and they said it was normal. Supposedly these engines can consum a quart of oil every 2,000 miles which I don't think this is acceptable.

@markharris7723 Месяц назад

@@fernandobarragan3330 Not acceptable for me either, I’ve never owned any vehicle new or old that consumed oil. I have to bring oil with me if I plan on a long trip, something I’ve never had to consider before.

@kwmiked 11 дней назад

All comes down to how the rings are broken in. They need to be put under load right away and heat cycles first couple hundred mi, if driven easy for first couple thousand mi, u may never get rid of the oil consumption now. Or it can take thousands of mi to get them to seal. Specially with synthetic oil

@MolotovGarage Месяц назад

76,000 on my 2023 LM2 zero issues

@jemery3 Месяц назад

agreed on the theory BUT the timing of it seems odd since, there was barely any lm2 tuning out when this engine failed

@BabyGators Месяц назад

LM2 tuners have been around for a bit. LZ0 is the one they haven’t been able to crack yet as far as I’m aware.

@sethlover6498 Месяц назад

na lm2 tuners have been around. lzo they have not completed yet. everyone wants tuners and power adders. then they destroy their truck. smh

@jemery3 Месяц назад

@@sethlover6498 I'm aware they've been around for some time. lm2 refresh interiors vehicles is pretty recent but the "1st gen lm2" have had tunes for a little longer but seems most likely this car didn't have the tune for very long.

@BabyGators Месяц назад

@@sethlover6498 yep. Spend 65k on truck, spend $5k on upgrades. Whine about a $2500 oil pump belt service at 200k miles. That’s pretty much every 3.0 forum

@traviscrown9189 Месяц назад

@@BabyGatorsaccurate. Don’t make too many people mad this morning with all those facts.

@1surfercross Месяц назад

I wonder if this is why GM switched to cast iron pistons on the new engines.

@DemonWorks Месяц назад

more robust, yes.

@Chuyennguyen454 Месяц назад

Why GM put aluminum piston in diesel engine? I dont understand

@PeeterPuncher Месяц назад

Also why they used an aluminum block for a diesel application is beyond me.

@hochhaul Месяц назад

@PeeterPuncher The Opel and BMW versions of this engine are also aluminum. It's a non-issue. Only downside is that the tuners won't be able to make crazy gains over stock.

@hochhaul Месяц назад

You do realize that aluminum pistons in diesels are common, right? The 6.7 Cummins uses aluminum pistons.

@WhiteoutSnowy Месяц назад

Is 3.0 eco diesel block made out of aluminum ?

@Buuboi214 Месяц назад

GM put steel pistons on the redesign 3.0 duramax LZ0

@andyjackson7475 Месяц назад

Great video!

@DemonWorks Месяц назад

Thanks!

@lance3613 Месяц назад

Was this an LM2 or LZ0 3.0 Duramax???

@DemonWorks Месяц назад

LM2

@ivankorth4458 Месяц назад

Love your channel , I have a question , I want to order a 25 suburban with LZO dsl , it will be mostly highway , approx 25 k a year , but twice a week the SUV will need to idle 2/3 hours . Will this long idle time mess with my DEF operation, should I be concerned about idling a DEF dsl ?

@DemonWorks Месяц назад

thanks for the kind words ! Yes, that idle time will end up hurting your exhaust aftertreatment system and cause you issues, unfortunately.

@EBIndy Месяц назад

Why do you need to idle for that long? If you are hooking a trailer up there are times you can shut the vehicle off.

@ivankorth4458 Месяц назад

@@EBIndy search n rescue dogs will be in the suv & need heat & a/c

@charlesb4267 Месяц назад

Is it true on the LM2 ( and LZ0 ) that when the engine goes into regen mode its the injectors themselves that over fuel to create the DPF burn off ?. If that is correct, is there a possibility that piston damage could occur if lets say towing hard while in regen mode. Certainly GM had a reason and be that to be able to handle more power or some other reasons to have gone to steel pistons that would be able to handle more of this over fuelling abuse.

@ethanlegler6403 Месяц назад

The additional fuel is added during the exhaust stroke though and increases the heat a little bit inside the piston in sure, but most of the heat increase is done by the DOC (I believe) igniting that unburned fuel in the exhaust stream to increase the temps to where they need to be for regen.

@DemonWorks Месяц назад

Yes, diesel fuel is introduced during the exhaust stroke where the DOC heats it up to create the burn in the exhaust system.

@WhiteoutSnowy Месяц назад

If he wanted more power then he should have gone with 6.6 to begin with.

@adambarras6566 Месяц назад

A 6.6 doesn't get 30mpgs and 1500s ride better.

@karlschauff7989 Месяц назад

Seems like there's a few guys out there that need to tow 10,000+ lbs and can't decide if they should go with an LM2/LZ0 or step up to a heavy duty. They end up going with a 3.0 and wish they had more passing power, so they start doing foolish things to boost the power for cheap. I get the price difference between a 1500 and 2500 hurts, but playing around with aftermarket stuff will cost way more if you destroy the engine.

@dsmnpd Месяц назад

I have a plug & play power adder and I keep it turned up and I tow. I watch my iDash and keep my EGTs below 1200.

@karlschauff7989 Месяц назад

lol you running one of those AG Diesel modules or something?

@dsmnpd Месяц назад

@@karlschauff7989No, not that, I have the Edge EZX.

@fernandobarragan3330 Месяц назад

Demon how difficult is it to replace the crankshaft cover on the LZ0?

@DemonWorks Месяц назад

The front cover? Are you sure it’s not the plug? Are you doing it yourself? Oil and Coolant Leak locations on 3.0 Duramax + Ground Issue ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-HLhqwX_3ByI.html

@fernandobarragan3330 Месяц назад

@DemonWorks The top cover. I think also called valve cover. Yes, I'm trying to do this my self. My truck is consuming two quarts of oil between oil changes and the Dealer said it was normal for the LZ0 engines. Since GM wouldn't do anything about it I'm planning to replace the valve cover to see if that helps with the oil consumption.

@therev6689 Месяц назад

No oil change and AG plug in “tuner”😂😂😂

@PeeterPuncher Месяц назад

Dont put tuners on throw-away engines!......An aluminum block diesel engine is a throw away

@OtisFlint Месяц назад

Tell that to the M57

@karlschauff7989 Месяц назад

The BMW M57 and B57 have been around for over a decade making even more power from basically the same engine design and there haven't been any issues with the block. You do realize that the primary reason diesel engines used to be made from regular grey cast iron was because it was cheaper than aluminum, not necessarily because it was stronger. An aluminum block can be just as strong as a cast iron block, it's all about the balance of weight and cost. 5.0 Coyotes are making over 1000 HP on 20+ lbs of boost and 12:1 compression and those blocks are not even particularly stout as far as factory engine blocks.

@DemonWorks Месяц назад

OK.