Duramax LLY Overheating Solutions
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- čas přidán 18. 01. 2018
- The Duramax LLY is a favorite for many diesel fans but it has its issues, like overheating problems related to a poorly designed air intake from the manufacturer. DT's Nick Priegnitz recommends fixes and other suggestions on how to keep your LLY happy for many, many years.
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I keep seeing videos of all these different problems with the LLY and it has me amazed that my 3500 dually made it to 300,000 miles as a full time cross country heavy towing truck at 100% stock other than regular fluid changes. The only problems I found evidence that the previous owner had were the connectors on the #2 and #7 injector harness had been spliced in and I found the wiring harness on the pass side of the alternator was starting to rub through. Just started surging a little last week, thinking its the FPR on the CP3, 300K miles I figure it deserves a new CP3 this coming weekend.
Thanks for all these videos you put out, I feel like an expert just from watching all your information, seriously appreciate it all.
Keeping it mostly stock and regular fluid changes are key.
I suspect many people who have lots of problems abuse their trucks and dont do maintenance.
Stay gold.
Thanks for your great work and passion for these trucks. Your videos are practical, very professional and informative. Please keep up with LLY information and tips for long term owners. Thanks again and keep up the great work!
Awesome as always fellas
loving these little touches on the classic d-maxes latley. appreciate it!
If you're running way hot up a grade you can use the old truckers cooling trick by rolling down the windows and turning the heat to hot as possible and run the fan on high. It sucks ass, but it works.
Great video, very informative.. thank u man
This is spot on!
I have another improvement suggestion that cured the problem you described for me. I got this idea from a guy in Canada, and it worked great! He found that when the cooling fan kicked on on a long grade under load that the intake would start drawing air primarily from inside the engine bay instead of primarily from behind the headlight, which creates a feedback loop between the intercooler and the turbocharger. One change that GM made in 2006 was to gasket the intake housing to a hole in the right side engine bay sheetmetal, likely to prevent just this issue. This brings outside air from the wheelwell into the engine instead of warm air from inside the engine bay, which breaks the feedback loop between the intercooler and the turbocharger. All I had to do was cut a rectangular hole in the engine bay sheetmetal slightly larger than the air intake, using the intake itself as a guide. Then I used foil HVAC tape to bridge the gap from the intake to the engine bay sheetmetal. Any heat resistant material would do to bridge this gap. GM used a foam rubber gasket of some sort. This cured my overheating on a long grade problem completely! Now, when the truck is moving forward at any speed, the intake air temperature usually remains between 1 and 5 degrees Fahrenheit above ambient. That being said, thanks for this wonderful and clear video, which shows me how to further mitigate these other design shortcomings that can only make this situation better. Your videos are the best!
You ought to make a video showing this mod... could be helpful to us LLY owners. I already have an aftermarket cold-air intake that was installed on my truck prior to my purchasing it, but I'd like to make sure it is pulling in air from the correct area (wheelwell and not engine bay) as you noted.
I found the same info and did the same mod -- worked great for me too!
I like the look of the external oil cooler.
Great informative video Nick. I was wondering if you could make a video as to why there has been no progress on L5P tuning. Thanks and keep up the great work.
Thanks Nick, I have the upgrade elbow like you showed with their air filter, I was tempted on getting a ranch hand type front grill to protect from any suicidal deer out there, but think I'll pass, I just tow a 16' wells cargo landscape trailer once a week, so far temps stay normal.
Very well said, I like the way you keep this practical, affordable and able for the average user to do themselves. Engine volume metric efficiency and thermodynamic efficiency is the goal. More air flow, decrease intake air temperature and this will keep engine oil temperature in control. The other byproduct of these actions will increase in air density, and with less boost can achieve the same or more reliable horsepower and torque at wide open throttle under full load. This is key for towing, flow makes it go------> (Tip: on a LLY you can cut out an inch on each side of the plastics that cover each side of your intercooler for total cooling surface increase of approximately 1.5 - 2.5%) And I fully agree if budget permits to upgrade transmission cooler and lines.
Well said Nick!
Thank you
I have an 04.5 LLY. I've installed the LBZ turbo inlet and a Banks air intake for an 06. Had the PCM tuned for the. MAF and I have EFI Live. I wasn't looking for a race truck, just a reliable rig to tow with. The tuner I used is no longer supporting EFI live. I did the gaskets around the headlights as in the TSB but I still have heating issues. My fan will come on with ambients around75 or higher when I'm driving in the mountains empty. I've had issues with the trans throwing codes and going into Limp mode on one of the "Light" towing modes so I don't use that one. I towed my fifth from SD to AZ last year in January. Coming back, I went over Wolf Creek Pass (10,800') and it was in the 40's so no heat issues and the ALLISON was phenomenal, providing braking on the descent (8%). I haven't cleaned the stack but it's planned for this spring as I have to replace the the lower valance. Do you have specs on the oil cooler? Is there anything that can be done to improve airflow through the stack?
Love the Engineer probably fired comment...lol Great video
I’m loving my LLY which I’ve owned since new.
I’ve I replaced the air inlet elbow, I replaced the turbo outlet down pipe, I replace the exhaust pipe went from 4 inch to 5 inch with a 6 inch top tip. I removed the cat. I removed any obstructions from the front of the grill. I replaced the transmission oil from Dextron 6 to Amsoil torque Drive and installed a PPE Deep and finned transmission oil pan. Finally I unplugged the EGR valve.
Now when I tow my 32 foot fifth wheel with a boat behind it my fan clutch doesn’t even kick in and my transmission barely gets warm amazing!
One more thing. The water pump is gear driven. So If the fan belt breaks you still have cooling fluid pump operation ( marine grade)
Thank you for this video, we just bought a very well maintained 2006 Silverado 2500HD with the 6.6 LLY and plan to tow a 12,000 +/- pound (loaded) fifth wheel with it. We are not interested in impressing anyone with our truck or our rig and only focused on reliability. I will do the turbo intake elbow upgrade and add an external oil cooler and perform the other checks you recommended. Thanks again for the insight and informative information.
Kurt's truck could be an early 06 with an RPO of LLY. Not all 06s had LBZs in them. Kurt, if your 06 has RPO LLY then you have a detuned LBZ. They are bolt-for-bolt identical, just difference in tuning because GM ran into a delay in EPA approval when the model year rolled over. Get your truck flashed at the dealer with the LBZ tune if you want improved factory performance or go have fun with an aftermarket solution. You'll be glad you did!
For the record; the improvements in this video do not apply to your 06 LLY. You need to be looking at the improvements for the venerable LBZ because thats really what you have.
What is the best way to get the radiator out on a LMM w/o discharging the A/C system.
my lly only gets 23 psi at idle when warm that seems still pretty good to me but i was just wondering if since its only at idle do the pistons need the cooling from the squirters if they only work past 27psi
Where would I buy the external oil cooler? Cant find it
What about swapping the water pump pulley with an LB7 pulley? (slow down the coolant)???
I have a Kodiak turbo inlet but still have the annoying fan and 230 up hill temps.
do you think that you guy could do i video on oil temps the proper place to install a temp sender and what kinda oil temps a trucks sees i have been looking all over the internet and no one has dose this yet i think that people could use this info thank you for your time making these videos
The Truck 2005 GMC Sierra 2500HD Duramax 4x4 with 330k+ on it currently and up till a year ago it was all stock. Now it has a 6" lift, 6 door conversion, 52 gallon titan fuel tank, and move bumper. I have to say that some not all LLY's may have a over heating problem but in this one it does 180 on the temp on a good day and has never got to hot. (before you say I need new stats yes it got a pair a ways back and it has heat in the winter) It pulled a 16' enclosed trailer for several years for construction. It has hauled all kinds of equipment, project cars and trucks up 11,500lb on a bumper pull for hours on the highway in the heat of the summer yet never has had this overheating people are all of a sudden talking about. Is this a new fact or have a few people have said it and now its set in stone. The LLY was the Duramax all the rock crawlers wanted for a long time now and that hasn't changed. Can someone explain?
Thank you for all your time and videos Mr. Priegnitz. I am currently looking for a trustworthy tech around Dayton, Ohio to do this elbow upgrade and external oil cooler on my 05 dually.
You could just go to Summit, get everything there & do the work in the parking lot.
Been there, done that.
What is the best method to check/test your engine cooling fan?
Is there a way to not use the oil cooler in the winter when your hauling? Question is do you need oil cooler in winter time?
If you have a problem running hot when pulling a load and no problem just normal driving you have a clog radiator. I just too my radiator out and gave it a good cleaning so I could see to the other side. I cleaned everything else the best i could and the over heating problem was no more. Take the time to super clean the radiator you will be amazed.
Great advice @joewynn1
What do you recommend for a LMM with overheating issue while towing?
Does the 06 have the same turbo intake restriction issues? And does it need a oil cooler. My 06 diesel has 440000 miles. No engine or transmission or even drive train work ever done on it. I pull a 38 foot fifth wheel camper with a bass boat or a tandem axle trailer behind the camper. Have had some heat issues. Driving 70 mph up long hills. Replaced fan clutch and had the radiator and turbo cooler pulled and cleaned. The heat has caused some low fuel rail pressure issue on long up hill pulls in the days of above 90 degrees.
I see you recommend an engine oil cooler -12an. What size and what adapter or kit do you recommend for this? I've looked around but haven't found a good oil filter adapter to do this mod for my 05 LLY Dually.
How about the coolant pressure cap?
Isn't a negative vacuum a pressure?
Hey Nick, great video 👍👍👍. I have an CA LB7 and suspect it shares a lot of LLY cooling issues. In fact, I’ve experienced high coolant temps while towing and need to take action. Regarding air flow, the original owner installed a Lund aftermarket grill insert, which looks awesome, but only has a grid of narrow, vertical openings. 😟 Never really gave it a lot of thought.
I think I will start addressing the issue with an oil cooler and go from there. Thanks for the wakeup call!
Steve Waclo was
Steve Waclo What
Can’t find where to but the exact oil cooler ?? Thanks
i wish you would have had this video back in 2007 when the guys at the chevy dealership was telling me 240F coolant was fine for a duramax and 235 F was normal for the Allison. Owell truck is long gone now .
holybuba the dealership doesn't know shit about the duramax s they sell.
there was actually a gm service bulletin for doing the intake elbow from the lbz
Where do you get this elbow at? Oil cooler ? What’s the cost . Is it California legal for smog test ?
Duramax tuner - where can I get this external oil cooler u speak of if there discontinued ?
Anyone recommend a good external oil cooler for my 2004.5 LLY?
This works the same for the LMM's right??
What is the cost of the elbow and oil cooler setup? P/N's??
Does the LMM need these items or do they already exist? Where do you tap in to do a boost leak check with the air psi?
Great Information.
An additional radiator helps too
Where can you get the oil cooler
Ok I just bout a hd2500 2006, with 190K on it. I need, want all of these. new turbo intake , Oil cooler,
Alright I would like to ask a question. I have an 03 Duramax and an 05 Duramax. Both are used to plow with the O3 does not overheat but my 05 will both are using the same plow same sander set up. I've already replaced the thermostats the fan clutch and have cleaned the radiator
So what is the question???
Does the overheating contribute to head gasket failures? I'm looking to purchase a 2004.5 gmc Sierra with 12,000 original miles. I want the truck to last a long time. I frequently tow my travel trailer as well as equipment trailers. Additionally, I plow snow in the winter. I know I have to keep my plow positioned just right on my 2008 6.0 gas truck to keep good airflow across the stack.
I know you are asking nick but no the main reason the gaskets fail is the gasket is made from really bad material the worst of all the duramax generations
In the description is says from 2004.5 to 2006, It was my understanding that the 2006 "lly's" are actually lbz's when it comes to hard parts but just had lly tuning. Let me know otherwise I need to be upgrading my turbo mouthpiece.
k5robnp2 actually the LLY was built for 06. But the only difference was the calibration. Otherwise it is an LBZ. So you’re right.
I live in CA if i put the S&B elbow on would my truck fail smog?
You will want to check S&B's website but I think they are CARB approved.
Is there a way to install a oil cooler while also running an Amsoil bypass setup?
Not sure, that would be a great question for the guys at Amsoil.
Byron, the sinister oil bypass system comes with external oil cooler
due yall think its fine if i put a ranch hand on my lml daully on the front? I am running wcfabs 369 with yalls built trans
Keep an eye on the EGT's -
Engine more important DEFROST to MAXIMUM
I have an 05 w/58k miles time to make it better
Thanx from the left coast near the Crapitol of California
Defrost engages the a/c compressor causing additional het in the cooling stack
@@shilothompson7672 so many people don't know this!!!
I'm gonna a buy an LLY. 154k miles.
How much
Do you know if this applies to LBZ as well? I have a 2006 GMC
No it does not. The LBZ engineering solved the intake elbow issue with the LLY.
How do you get the s&b turbo inlet to ca? Nobody company ships it there
Give us a call, 815-568-7920.
how about a 2007!/2 lmm overheating what can I do.
All stock?
Is adding the external Oil cooler something an above novice can do?
You got to start somewhere.
Does the air intake elbow fit on the vans as well?
Not without some creative customization.
This being such a big issue why didn't G.M. recall this problem?
Install a Hayden 2866 fan clutch..engine bay will thank you
@white24valve Thanks for the recommendation!
Can a reall cowl hood work aswell?
We haven't tested but in theory, it should.
I own a 2005 Silverado 3500 6.6 LLY I have a little over 260000km.about 161500miles..in all these years I have finally got a problem . It's the FICM. I Have only used GM parts .Now that GM no longer builds these FICM's I am looking for help in finding a reliable FICM. Any help locating would b e appreciated
car-parts.com is your best bet.
NO WHERE can I locate an external oil cooler for an LLY Duramax. They are available for the Transmission in the automatics, however NO ONE has an external oil cooler for the ENGINE OIL as you explain.
Do you have these proprietary and selling them as such? If so, I would love to buy one for my LLY!
Look up CDP external oil cooler for Duramax 2001-2016
Does upgrading the rad help vs cost?
Haven't looked much into that to be honest.
I’m considering buying my dads 05 gmc with the LLY. Only has like 120k miles. It’s a crewmax 4x4 2500. I could get it for like $10k. Good buy? Anything I should be thinking about with that engine other than what you talked about in the video.
We cover the basics pretty well in this video. Check the upper radiator hose, boost test, verify it can hold rail pressure, and check all the fluids.
Duramaxtuner thank you for the advice. I’ll definitely do it
I have a 04' lly and I'm having a p0102 code keeps popping up. I need help to fix this problem any suggestions?
What steps have you taken so far to diagnose the MAF issue?
@@Duramaxtuner Matco maximus 2.0 scanner.
I changed the Mass air flow sensor 3x and changed my air filter. Now it says low voltage Mass air flow sensor
Do you offer a LLY oil cooler setup?
Not at this time.
Duramax Tuner on a lly whats better lbz mouthpiece or sbc mouthpiece
Which ever one is in stock. We would expect identical results from them.
Thanks my truck has lbz mouthpiece but just wanted to know if sbc is better so I can switch it
Whys mine blowing white smoke?.feel like uncle buck
We'd need a code or to get our hands on it to answer that.
Is this needed for the LBZ?
Nah, the LBZ is bombproof
@@fordfails3439 there is no dmax that is bomb proof. I see them all the time on the interstate broke down and 50% of them always blowing blue smoke from bad injecters or burned up rings...please lol.
Wanna talk about the 6.0 and 6.4?
The Duramax LB7 was the first common rail injected diesel. Of coarse new technology has it's issues. The ones you are seeing smoking are LB7's. Common injector problems.
You do realize that the LBZ was the diesel to have when it came out? It put out shit ton more power than the Cummins, and the Powerstroke was shit at that time. The Duramax killed the Cummins, and still is.
Also, let me know when your Powerjoke or Cummins has a dump truck and bus transmission in it
If it ain’t crip it ain’t drip #Cummins
Best way to fix this issue - buy an LBZ.
No oil pressure truck won't start has crank
Oi l pressure is like blood pressure . One it drops u drop and ur truck drops lol
Or you could just roadkill it, take off the hood
Speciosa hi
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where do I buy the External oil cooler -12an?
Preeeettty much anywhere on the Internet. It’s just an oil cooler.
Would this be beneficial for a LB7
Nathan B not really, lb7 is a completely different animal
LB7s don't have this problem.
Jellyfrosh, Unless it is a CA LB7, which has an EGR cooler 😟.