Love the truck. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. The write up confuses me. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. NOT GOOD!! My 5.3 is. Just one. Next day I drove my car to work and was fine but when I left work all lights came back on and terrible noise in the hood. I am a long time GM fan but after reading how they messed up the 5.3 ( I had a fantastic 2003 Z72 off road) Ill look else ware for my next vehicle. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. Send response to tkrieg@cox.net. So I did the job one more time. The engine was not Flex Fuel (E85) capable and did not use Variable Valve Timing (VVT) [], [] TheL76like its LS2 siblingis a 6.0L, Gen. 4, aluminum small block engine that was used both in GM cars and trucks. The detergent. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. I have a Yukon 116k it now needs its 3rd set of lifters and cam. The trucks are only supposed to use two four. Ive read at many websites that the GMCs envoys, Chevys and saabs did start to come with AFM in 2005 with the LH6 motor,It says here it started in 2006 on the saabs, then the pick-ups got AFM in 2007. IMHO . But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. 50,000 miles. The engine has flex-fuel capability. I guess I might have to call a dealership or GM to get a definite answer on this one. It's been an issue for a while but I've been getting past it by turning the key only to the off position instead of all the way back to "lock". My point is that the engine likely on uses dod a small percentage of the time so can not really imagine that the delete causes any more issue than normal which may be the high oil consumption but do all of these engines with dod consume a lot of oil? Corvette that does employ AFM. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. General Motors Active Fuel Management Cylinder Deactivation Technology Active Fuel Management (AFM), otherwise known as Cylinder Deactivation is a General Motors engine technology that. I have 1999 5.3 Silverado that gets 19-20 miles to the gallon all the time this shit pile with dod only gets 14 miles to the gallon. Now you tell me AFM works and I will tell you; that you are full of shit! Then again, it should have never been controlling those solenoids. The only solution is to replace the entire cylinder head. Some guys have been able to use a tool through the top with the cover off to get it to release. All Gen IV engine blocks haveAFMtowers and oil passages cast in. Now I get 24 to 26 with deactivation locked out and full power. Better airflow reduces drag on the pistons and the associated pumping losses. how many miles do you have on your engine? Where can I buy a bolt to replace this relief valve ?? Bought an 07 GMC Yukon 5.3 with the AFM, 87k. Given maximum engine power is not required during the majority of everyday driving, AFM works to deactivate engine cylinders when they are not needed, such as when cruising on the highway, thus. Solenoids, new lifters also test voltage to solenoid pack all good their, Will the plug in cause my truck to burn more oil or will it fix the oil consumption issue? Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. I will be installing the AFM deactivator tonight when I get hoe. But not sure very annoying. I got the AMF disabler anyway and so far so good. AFM - active fuel management strategy which deactivates the lifters on specific . Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? With 40000 A 17 with 5.3. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). Our 2013 yukon with 47k miles just failed. On June 4th you stated The vehicles affected were 2007 to Feb. 2011 AFM equipped engines (Aluminum or Iron block-L94, LZ1, L99, LC9, LH6, L76, LFA, LMG, and LY5) I am looking at purchasing a 2012 Tahoe with the LMG per the build sheet. It works . They learned that the oil level sensor was necessary and that we were supposed to have been advised that we needed to reuse the original oil pan. Open to suggestions about best course of action. Why this happens is a more . My 2011 Tahoe has a LMG motor in it with a build date of May 2011. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. Brian, I have been reading your article about the AFM. I still get a P0336 code every once in a while but still good to drive around town. The Definitive Guide to LS Engine Specs and LS Engine Upgrades, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance - OnAllCylinders, LS Engine Bore & Stroke Chart - OnAllCylinders, http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc, Range Active Fuel Management Disable Device, LS9 6.2L Engine Upgrade Guide: Expert Advice for LS9 Mods to Maximize Performance - OnAllCylinders, LMG 5.3L Engine Upgrade Guide: Expert Advice for LMG Mods to Maximize Performance - OnAllCylinders, L59 5.3L Engine Upgrade Guide: Expert Advice for L59 Mods to Maximize Performance - OnAllCylinders, L76 Car Engine Upgrade Guide: Expert Advice for L76 Car Engine Mods to Maximize Performance - OnAllCylinders, LH8 5.3L Engine Upgrade Guide: Expert Advice for L20 Engine Mods to Maximize Performance - OnAllCylinders, LH6 5.3L Engine Upgrade Guide: Expert Advice for LH6 Engine Mods to Maximize Performance - OnAllCylinders, LFA 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More - OnAllCylinders, LFA 6.0L Engine Upgrade Guide: Expert Advice for LFA Engine Mods to Maximize Performance - OnAllCylinders, LZ1 6.0L Engine Upgrade Guide: Expert Advice for LZ1 Engine Mods to Maximize Performance - OnAllCylinders, What the New LT2 Mid-Engine Corvette Reveals About the Future of GM LT Engines, All the Torques: How Summit Pro LS Truck Camshafts Help Truck Owners Maximize Performance, LMF 5.3L Engine Upgrade Guide: Expert Advice for LMF Mods to Maximize Performance - OnAllCylinders, L98 6.0L Engine Upgrade Guide: Expert Advice for L98 Mods to Maximize Performance, LQ4/LQ9 Engine Upgrade Guide: Expert Advice for LQ4 & LQ9 Mods to Maximize Performance - OnAllCylinders, Range AFM Disabler Reviews | Range Technology AFM Disabler 2019, LS3 Engine Upgrade Guide: Expert Advice for LS3 Mods to Maximize Performance, LM7 5.3L Engine Upgrade Guide: Expert Advice for LM7 Mods to Maximize Performance, LS4 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L76 6.0L Car Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, L96 6.0L Engine Upgrade Guide: Expert Advice for L96 Mods to Maximize Performance, LC9 5.3L Engine Upgrade Guide: Expert Advice for LC9 Mods to Maximize Performance, LH6 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, LZ1 6.0L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More, Chevy 4.3L Vortec Common Engine Problems - Vortec 4300 V6, https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-…, The 5 Most Common Chevy EcoTec3 5.3L Engine Problems, Chevy 6.0L Vortec Engine Problems - Common Vortec 6000 Problems, The 4 Most Common Chevy EcoTec3 6.2L Engine Problems, Gen 3 vs. Gen 4 LS Engines: How to ID Them (Video), Ask Away with Jeff Smith: Upgrades to GM LS 6.0L 4x4, LM4 5.3L Engine Upgrade Guide: Expert Advice for LM4 Mods to Maximize Performance, L33 5.3L Engine Upgrade Guide: Expert Advice for L33 Mods to Maximize Performance, Mailbag: Choosing an Engine Management System for an LS-Swapped '82 Olds Cutlass. So I researched and got an AFM disabler. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). The older truck gets 19 mpg the newer truck with fuel management gets 14. I drive the same 320 mile trip every two weeks and drive the same route and full tank. Will this AFM DISABLER damage anything???. Im curious as to how much tran fluid you put in? Cylinder Deactivation (Active Fuel Management) General Motors Active Fuel Management engine control system has the ability, under certain light load driving conditions, to provide maximum fuel economy by deactivating 4 of the engines 8 cylinders. Why would GM ever produce such problems with such little to gain. I just did the delete and replaced the cam as well. Only thing I noticed with the oil consumption issue. The valve itself is part number W0133-2574213. One must anticipate this. No problems with any to this point. All New lifters were from AC delco. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. 2015 SILVERADO 1500 44 crew cab with 5.3L engine: So two weeks ago with approx 70K miles, I had an odd noise when accelerating and then engine light flashing and riding rough. There are a few potential causes for Chevy cylinder deactivation problems, including oil consumption problems, harmful to the environment, sludge issues, and lower cylinder temperatures. After taking a $3.6h bath on the lifter/valve work and doing a little research, how can GM allow a problem like this AFM continue from 07 to present? One the other hand, it came without AFM, VVT, or flex fuel capability. It only has about 9k miles on it. I contacted service manager in Gastonia, NC and he was kind enough to tell me the whole history of the problem.. EPA required better fuel mileage and less emissions and GM, Ford and Honda(V-6) came up with this failed AFM system. Regarding the cylinder deactivation impact on fuel consumption . NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades. If you just crack it without it starting it moves all the time .
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