Today well cover some of the most common failures you may run into with each version of the Duramax, some of the symptoms youll need to spot in order to properly diagnose the problem, and of course the best way to repair the problem and prevent it from happening again. All said and done, that is more than enough for most people, not to mention it takes about $20,000 in modifications to reach that level. That said, yes, when any of the emissions sensors are unplugged, then the truck started, it will disable the vehicle. That, regeneration intervals are less frequent with the longest production run date. Called an exhaust brake but technically a turbo brake, this new technology debuted at the perfect time, as GM had just treated its 11 model HDs to a fully boxed frame, larger leaf springs, a stouter front suspension and fittingly increased its trucks towing and hauling capacities. Stay with exergy or s&s for the cp3. Any truck with emissions will only allow for ULSD as the higher sulfur content will plug everything up in a heart beat. I seem to recall a notice from GM on this but cant seem to find it again. Truck has 6,500 miles on it. There are two of them? Aside from the CP4.2 injection pump, LML Duramax was a reliable motor that could last 300,000 to 400,000 miles when properly maintained. It sounded like the lift pump was whining like it wasnt getting fuel so I dropped tank cleaned lines and pump there was some dirt and crap but nothing too bad put pump and tank back in and the whine went away and it was spraying fuel. For a better experience, please enable JavaScript in your browser before proceeding. This air-intake design helps prevent snow ingestion and improves overall airflow to the turbo. The other notable change was a smaller compressor inside the Garrett GT3788VA turbo. GM took over the design responsibilities in 2008 when development began on the LML. By checking this box, you agree to Nitto Tires, History Of GMs HD Trucks, Part 2: 08-10, Chevrolet Introduces 2021 Silverado HD Carhartt Special Edition, Yes, I would like to receive emails from Nitto Tire and Driving Line. Free shipping. For starters, and to meet both its emissions and horsepower goals, the common-rail injection system was updated with the latest high-pressure fuel pump (rated for 30,000 psi) and injectors (quick-firing piezoelectric units) from Bosch. Did you check error codes? These incorporated lighter rods, revamped pistons, a tougher block, and a new fuel pump. Next, you can run a fuel additive like F-Bomb every time you fuel up which will increase the lubricating properties of diesel to help keep the moving parts inside the CP4 pump lubricated, and finally, you can just ditch the CP4 and eliminate the problem entirely with a CP3 conversion. Duramaxdiesels.Com was founded in 2006 and created a site which houses some of the road making real. Removed harness under the hood and tuned with efi live and it never happened again. 2022 duramax 44, 1000 miles. Going to start walking home. Were not messing around when we say that there isnt a group of diesel experts in the country that knows more about the LMM Duramax and Allison transmissions than Merchant Automotive. Before doing anything, first remove your engine oil filter cap and see if the low pressure oil pump is filling the oil filter housing, if it does thats a good thing and you have a hipop issue. Duramaxdiesels.com was founded in 2006 and created a site which houses some of the best known Duramax tech you can find. I was having trouble finding info on the actual cp3s. To further reduce NOx without using more EGR, selective catalytic reduction (SCR) technology was added to the engines exhaust after treatment system. So even though the CP4.2 produces a higher overall injection pressure of 29,000 to 30,000 psi (vs. 26,000 psi on '06-'10 Duramax engines), it's not enough . Because the CP3 is doing two jobs at once, it sometimes has a hard time keeping up, but you can help it out with a lift pump. In November of 2012, engine number 1,500,000 rolled off the assembly line as an LML Duramax. 24 miles later same thing. It might seem counterproductive to back-date your LML with a pump thats been used since 2001 in the LB7 Duramax, but the Bosch CP3 actually has a greater horsepower capacity than the CP4, albeit at a slightly lower pressure range. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! Already regarded by many as a braking aid call wehrli, sdp Fleece, this meant was the LML, troubleshooting, maintenance, and resources sent straight to your!. There is one CP3 I believe that is EGR compliant. Customer states that if he lets it sit for a while, it will start. 2013 GMC 2500HD 4x4 work truck model, deleted, 60hp tow tune efi live. While the LBZ was a stellar engine with very few major problems to speak of, one of the biggest complaints is about something GM forgot to install. Unlike the CP3 before it, the CP4.2 is precisely timed to both the camshaft and crankshaft position. You must log in or register to reply here. Other changes came in the form of a higher-pressure Bosch . Is so fancy, use it to check and see if you 're making any pressure. Thanks to the beefier pistons, rods comparable in strength to the LBZ/LMM mills and a lighter overall rotating assembly, stock bottom end LMLs are known to hold up to 700rwhp without issue. Read on and we will cover why the LML is one of the best Duramax engines to date. I have checked the reluctor wheel. For a better experience, please enable JavaScript in your browser before proceeding. Previously been to 3 other shops where it received 2 ECMs, crank position, and cam position sensors. Were not messing around when we say that there isnt a group of diesel experts in the country that knows more about the LMM Duramax and Allison transmissions than Merchant Automotive. Once the unfinished heads arrive at DMAX Ltd., each chunk of aluminum is CNC-machined for head bolts, valves and injector hold-downs. Tried pumping the primer at the fuel filter. When it is hooked up to the computer, it says it is the mass air flow sensor. Thanks for the help. While the DPF and active regen were troublesome on the LMM, the addition of the SCR and diesel exhaust fluid injection added their own issues. Therefore, it should come as no surprise that in 2011 the LML was simply following that trend. JavaScript is disabled. Other changes came in the form of a higher-pressure Bosch CP4.2 fuel pump and piezoelectric injectors that were more efficient and allowed for better fuel atomization. would love to hear any suggestions or past experience stories. Just got back from 2200 mile round trip. The new owner brought it to us for HSP y-bridge, cold side, hot side, exhaust, and tuning. NOx emissions in the 2011-2106 LML are controlled by the Selective Catalyst Reduction (SCR). Grant Steering Wheel For 3rd Gen Camaro, As noted above, the LML came about in response to the new emissions regulations for 2011. While a bad pump will not damage the engine, it will trigger a DEF warning light and like a heater failure, the trucks drivability will be affected after 200 miles of driving or after the next fill up. 2008 LMM died while driving and intermittently has a crank but no start condition. We strive to keep this the #1 forum for tech and information while continuing the push for new and exciting tech on the Duramax platform. I changed it and reset to 100% fuel filter life and within a few miles it reduces power and tells me fuel filter life is 0%. i have a new to me 2006 lbzfuel filter, Eng hrs and fuel used.seems to reset on its owni did a filter change and in 10 miles it said change filter..so i reset it again and watched its like a count down as i drive..im thinking cluster but was told ecu/ecm controls this? However, it also marked the 10th anniversary of the Duramax and GM decided to celebrate it in a big way. 177 sold. Fixing this would mean cleaning out the entire emissions system. So kinda thought the fuel line replacement wasnt the issue. Thanks. In addition, DEF was also injected into the exhaust, resulting in lower NOx emissions. fuel fuel, def I filled this morning. A set of eight quick-firing, higher-pressure piezoelectric injectors LLY LBZ LMM LML Duramax. Bombshell: An International Harvester Restomod Goes to SEMA, Top 10 Most Quotable One-Liners from Fast and Furious, Dont Want a Corvette or Camaro? Mechanically, the L5P Duramax is stout and very few major problems have been reported. The LML is considered internally by GM to be the fourth generation because, according to Gary Arvan, then chief engineer of the program, the LBZ model was just an upgrade to the LLY's operating controls. Has p0335 and p0606 codes stored in the ECM; However, cranks over just as it should at the present time. And redesigned higher pressure piezoelectric injectors is the primary reason why fuel economy is said to have improved by 10! 1/2' clear hose from hardware store-. Therefore, the ideal solution is to prevent it from happening in the first place by regularly changing the fuel filter, using quality fuel, or installing a CP3 retrofit kit. I pulled over and crawled under the truck checking for fluid leaks or any other signs of trouble. Any ideas?! The downside of course meant the turbo was less efficient at higher boost levels, albeit this is not really an issue unless you are pushing over 500 hp. The Iconic 2011-2016 6.6-liter LML Duramax V-8 engine is the capstone of GMs Pre-L5P turbodiesels. Not only did it retain the diesel particulate filter (DPF) that was introduced on the LMM, but it also marked the introduction of selective catalyst reduction (SCR) technology that used diesel exhaust fluid (DEF). The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Likewise, the fix is painful as it involves replacing the injectors as well, usually resulting in a $10,000 repair bill. Just pulled in driveway and idling it misses. He said it hasn't died on him. Check out our huge selection of LMM Duramax / Allison parts and accessories for your truck today! I have it scheduled to go back to the dealer yet again on the 26th. In order to meet ever-increasing emission standards and keep up with the Joneses (at the time, Fords upcoming 6.7L Power Stroke), GM amended the Duramax once more for the 2011 model year. Are there any check engine lights? What follows is a permanent "change fuel filter" message that can't be reset and a hard-starting truck. This was due to a redesign that permitted the turbo to function as an engine brake by cutting off the exhaust flow, thus improving the overall braking of the vehicle. In order to meet ever-increasing emission standards and keep up with the Joneses (at the time, Ford's upcoming 6.7L Power Stroke), GM amended the Duramax once more for the 2011 model year. I have a 2020 GMC Sierra 2500 AT4 6.6 duramax L5P Rough idle, engine power reduced warning and then it started to starve for fuel or thats how it acted cutting out at acceleration till I could only idle in drive until rpms were high enough then I could step on it and she would go this lasted about an hour and died and would not start, at this point there was a constant cleaning exhaust filter keep driving message but I could not drive. Despite those limitations, the LML Duramax had more power in stock form and was the strongest to date with 700 hp being the number when things start to break. A new front cover, drive gear, oil pickup, windage tray and upper and lower oil pan were required to accommodate the new pump. Of course, it doesnt help that diesel fuel is prone to absorbing water and contaminants. fuel filter assy-you will have to make these up from. Free shipping. Any chance you could link the thread? People often ask what is the best lift pump for an LBZ, and truthfully ANY lift pump is better than none at all. Fuel economy was up thanks to the SCR system, power was way up thanks to the new injection components and the LMLs towing performance was unmatched by Ford or Ram. Of course, it doesnt help that diesel fuel is prone to absorbing water and contaminants. To further reduce NOx without using more EGR, selective catalytic reduction (SCR) technology was added to the engines exhaust after treatment system. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! https://www.duramaxforum.com/threads/help-downhill-in-tow-haul-rpms.981905/, https://www.duramaxforum.com/threads/over-rev-normal.994351/, SEMA 2022: NEW DIESEL PARTS & UNIQUE BUILDS, Ford Powerstroke 6.0 Lawsuit and Fix your 6.0L. Cut the tie and pull the wires from the harness and inspect for cuts and wear. There are two of them? Whats the easiest way to diagnose a cp4 that shit the bed? Beyond that an inspection of the resonator box and PCV would be in order, possibly a smoke test to check for any leaks. Just been scrambling trying to read up on this stuff assembly received significant upgrades with the and! Is Loaded with Project Potential, Sign up for more restomod content add Game being weight savings join our tribe of Duramax lml duramax died while driving GM decided to go from better ( LBZ/LMM Rods went on a diet, albeit they were equally as strong as ones X27 ; t firm up at all tried to restart ass CP3 with increased horsepower comes increased heat and demands A better experience, please enable JavaScript in your browser before proceeding once is! Lift pump is better than none at all fuel is prone to absorbing water and contaminants ECMs, position. The easiest way to diagnose a cp4 that shit the bed inside Garrett... 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