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.
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.”
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!
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.
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....
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.
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.
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 .
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.
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.
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.
@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.
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
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.
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.
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.
@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)
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!
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 ?
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.
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
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 th-cam.com/video/HLhqwX_3ByI/w-d-xo.html
@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.
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.
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.
@@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.
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
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.
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.
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.
@@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.
@@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
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.
![ILLSLICK - KILLSHOT REMIX [FULL VERSION]](http://i.ytimg.com/vi/RIK8RrqIAzE/mqdefault.jpg)
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.
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.”
Just watched Eric’s video the other night. Glad you watched and commented on it.
Awesome! Thank you!
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!
Where is the harness chaffed? Wondering if it’s a preventable issue with wire routing/shielding
@@clintgriffith8479 they told me it was where the main engine harness collects and turns toward the driver side wheelwell. $1k for the repair.
@@DaBelch Thanks for the reply! Gonna check this weekend and see if It’s a preventable issue with mine as well.
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.
Thanks for the kind words !
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"
I would love to know who the tuner was. Only a handfull of tuners out there.
Just hit 60k on my 3.0.... zero issues
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.
Mee too !!🎉
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
.
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....
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.
76,000 on my 2023 LM2 zero issues
As always great video man.
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.
tuning is not illegal in the US
Do you think the Banks Pedal Monster could cause something like this or it is safe to use?
Banks pedal monster will not cause this. The pedal monster changes the throttle sensitivity and does not add any fuel or boost, so all is well.
Great video!
Thanks!
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.
'Merica !
@DemonWorks did you know, that if you google translate 'merica! it's 'PEPPER!
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 .
correct, injection pump timing is irrelevant. I mentioned that because the teardown video, Eric mentioned it as a possible cause.
If instar can sell our info why can't they report if no maintenance item resets?
good point
If a power tune only hurt the centre pistons ,why was a Gasoline dilution ruled out ?
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.
Crazy but the lz0 come with upgraded pistons
Yes, they are forged steel vs the forged aluminium ones in the LM2.
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.
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.
Why GM put aluminum piston in diesel engine? I dont understand
Also why they used an aluminum block for a diesel application is beyond me.
@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.
You do realize that aluminum pistons in diesels are common, right? The 6.7 Cummins uses aluminum pistons.
Is 3.0 eco diesel block made out of aluminum ?
GM put steel pistons on the redesign 3.0 duramax LZ0
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
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.
Was this an LM2 or LZ0 3.0 Duramax???
LM2
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.
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.
@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)
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!
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 ?
thanks for the kind words ! Yes, that idle time will end up hurting your exhaust aftertreatment system and cause you issues, unfortunately.
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.
@@EBIndy search n rescue dogs will be in the suv & need heat & a/c
Logic says that if you are not happy with the factory power output of your engine, you bought the wrong vehicle.
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.
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
Demon how difficult is it to replace the crankshaft cover on the LZ0?
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
th-cam.com/video/HLhqwX_3ByI/w-d-xo.html
@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.
I wonder if this is why GM switched to cast iron pistons on the new engines.
more robust, yes.
God damn eric tears down an engine and this guy is turning heads throughout the auto community
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.
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.
@@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.
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
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.
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.
Yes, diesel fuel is introduced during the exhaust stroke where the DOC heats it up to create the burn in the exhaust system.
If he wanted more power then he should have gone with 6.6 to begin with.
A 6.6 doesn't get 30mpgs and 1500s ride better.
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.
No oil change and AG plug in “tuner”😂😂😂
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.
lol you running one of those AG Diesel modules or something?
@@karlschauff7989No, not that, I have the Edge EZX.
agreed on the theory BUT the timing of it seems odd since, there was barely any lm2 tuning out when this engine failed
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.
na lm2 tuners have been around. lzo they have not completed yet. everyone wants tuners and power adders. then they destroy their truck. smh
@@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.
@@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
@@BabyGatorsaccurate. Don’t make too many people mad this morning with all those facts.
Dont put tuners on throw-away engines!......An aluminum block diesel engine is a throw away
Tell that to the M57
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.
OK.