gm cylinder deactivation problems

module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. 1981 Cadillac V 864. My 5.3 has a vin code of O. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. i currently get 8 mpg with the vortec 350 and a 4l60, I have a 99 Sub k1500 that i get 16 to 18 hwy loaded lightly, I get about 14 on my 95 Tahoe 2 door with 5.7 and 4l60. I wear hearing aids, but I thought I heard more engine noises, but after checking the gas cap, the light went out for a week. [] block engine used in GM hybrid trucks and SUVs between 2008 and 2009. The 2nd went with a conventional valvetrain. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. I will be installing the AFM deactivator tonight when I get hoe. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. I hate it. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. I have a shop 39 yrs . We believe this confirmed that the AFM has never been operating in this vehicle. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. While it does still use the GM Active Fuel Management cylinder deactivation technology that caused a plethora of issues on the gen-four Vortec 5300 engines, it seems that GM has solved the issues related to excessive oil consumption. Truck has an active P0300 code and runs very rough. If you dont have VVT, you could use part number NAL-12561721 (LQ9) along with a 4-pole 3-bolt 2005 Corvette cam sprocket p/n NAL-12586481 to make it compatible with your ECM. Stopped at nearest gas station and found I was a quart low on oiladded oil and lights eventually went off and luckily we made it the 5 hour drive home. I was getting ~ 30 mpg, so I love that. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Just pulled it down in the garage there was no other damage , luckily. A new class-action lawsuit has been filed against General Motors over alleged issues with its Generation IV 5.3L Vortec V8 engines. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. This is in response to pretty much everyone. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. Junk . You were lucky that it worked. This new lawsuit is essentially identical to the previous. I can literally drive from Seattle to Redding CA on one tank. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. The original version sprayed oil on the cylinder walls and increased oil consumption. If thats the case, Summit Racing has dedicated truck cams that will increase power through the rangebottom to topbut the meat of it is in the mid-range where your engine spends the most time. [] they have a downside? I ordered a electronic disabler for it today. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. I have always loved Ford and Chevys , I dont like this Vehicle not one bit, starring shaft has to be lubed or it whines, front A arms has done been replaced, tapping in motor, leaf springs has been lubed, retorqued, put completely new leaf springs back in on the rear , grease all down from rims to body of truck, you have to clean often,console shakes as if milk shakes in console which later they also put rubber bushings in front of coils of shocks ( front end) .You lock it down in 44 it s metal to metal , As of now Im at 32,000 done gone threw all the arbitrator laws depending on how it goes? Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. I drive the same 320 mile trip every two weeks and drive the same route and full tank. There is a chance the cam lobe was stressed and started to deteriorate. You can unplug the sensor on the vacuum booster and it will fool the computer into thinking there is a high demand on the engine and shut down the AFM system but you will have a Check engine light in your face for doing so . Engine oil pressure is fine. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). [] engines is that when VVT (variable valve timing) appeared and was later followed by AFM (which is Active Fuel Management, when the engine deletes four cylinders under light load) both of these packages drastically affect []. . I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. Will this AFM DISABLER damage anything???. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. Wed recommend a call to our partners at Summit Racing. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? Put an S&B cold air intake on last week with huge oiled filter and it made a big improvement in throttle response and it appears possibly a slight improvement in mileage. They are taller and have special oil holes. Ill Never Ever buy another gm. Change your oil. Would installing the Disabler solve this? Its a CA EMMISIONS TRUCK. Can you tell me what needs to be done with the VVT? Perhaps a flaw by design would be a more appropriate description . Remembered that after I bought my Tahoe. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. Been driving with no issues but I did notice that the AFM disabler removed a P0449 code (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction) dont know if this is a coincidence or they are related??? Dave, I also have a 2008 LTZ avalanche with 106,000 I have the exact same symptoms at this point I just want to sell it will the disabler help remove the check engine light wont pass inspection with light on thanks for your help Chris. Why would GM ever produce such problems with such little to gain. Then changed the oil. She had driven it for a couple of months that way. Who knew? The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM . You could also have tried that if the trans oil didnt work. Why doesnt anyone make an aftermarket set of replacement AFM lifters that are the right length but DO NOT COLLPASE! My 5.3 is. I recently bought a low mileage 2013 Silverado and the lifters collapsed. The main misconception is that shutting down half the engine's cylinders reduces fuel consumption because the . A 17 with 5.3. I have 217,000+ on it and it never fails meever! Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. HELP, I have 2005 envoy that runs makes lifter noise then dies in about 30 seconds then I started it one day and it ran with little noise for 5 min started next day and it starts and dies again got heads off was told I could put ls 3 lifters in is that true or is there something else I could do thanks Duane. I have read synthetic isnt good for AFM lifters. Below youll see references to the L99 as a result. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. Gary, [] 3 engines didnt have AFM (Active Fuel Management) or VVT (Variable Valve Timing), so you dont have the expense of an AFM or VVT delete []. Look for the following: TheAFMcover is called the Lifter Oil Manifold Assembly (LOMA). The exhaust valve remains open during the intake stroke and closes just before BDC. Didnt change exhaust nor tune so likely no change in power/torque. This is my second Avalanche and I never had any issues with either of them. This reduces expense when you build it [], [] intake, and a cable-driven throttle body, plus Im also installing Trick Flows VVT and AFM delete kits. 2 15 with 5.3 Sierras both with 100k and Some drivers want V8 power under their foot at all times. The motor I pulled was a 2007 LY5 with about 77k on it. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. There are so many moving components in an engine these days as opposed to the past. Its Chrysler and Ford. Hopefully he can free up the stuck/collapsed lifter. Yesterday my motor (116,000 miles) felt like it went into limp mode when decelerating from 8 cyl to 4 cyl but it recovered.This is the second time that this has happened in 6 months so I think that I am on the slope. Battery was unplugged for a week.. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. All eight cylinders are now powering the engine. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. Now you tell me AFM works and I will tell you; that you are full of shit! Thanks. It is replaceable.. just remove oil pan and it will be on top at the filter. They took the engine down today found so much damage inside they ordered a new engine from Detroit. Verified over hundreds of trips, makes no sense. The engine is running on only four cylinders. Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. Regardless of the AFM solenoid being commanded on or off. At this state, a disabler would probably do what you need it to do. what deleter (if thats a real word) have you heard good things about. One must anticipate this. What makes you think it was a design flaw ? I would appreciate it if you let me know how you make out. the body is in great shape. Yes thats true. If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. However, they are only functional on engines that usedAFM. Im servicing a 2011 Chevrolet 5.3 with AFM. Ive been a Ford guy my whole life, so I was unaware of AFM until a recent trip where I did a lot of highway driving and happened to bring up the real-time mpg display, where I saw it switch between V6 and V4. In four-cylinder mode, they act like air springs and allow for smooth operation. I havent has any lifter or cam issues. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. But if you dont like it. If a shop pulled a DTC code P0300 and found AFM to be the issue, it may not be too late to try the disabler. Did Obama make them do this? Cost about $250, but it is not fool proof. What was happening to the first is slowly (or quickly in your case) happening to the others. The GM 2.7-liter L3B Turbo four-cylinder engine for Chevy Silverado and GMC Sierra pickups is meant to change minds about power and torque in a small package. bought at Brian Tooley Racing ! [] 5.3L engines start in the $600-$1,000 range and go up to a little more than $2,000 for the 6.0L and 6.2L engines. Fuel pump failure is the most common problem and can occur due to a number of reasons, such as a clogged filter or a faulty pump. Where can I buy a bolt to replace this relief valve ?? Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? Its job is to direct the flow of pressurized engine oil to the active fuel management intake and exhaust valve . Hi Grant is that disabler still working for you ? Runs better than new now and no more oil consumpsion!! My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. the extra oil isnt needed. This allows the engine to run in V8 mode. Didnt really notice a loss in power other than the surging, (wondering if thats the engine trying to switch between 4 and 8 cylinders). I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. Brian, I have the same question as Scott. Does the Pressure relief vavle ever go bad?? Any truth to that? 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. The trucks are only supposed to use two four. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. 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. The engine will switch to operating on fewer cylinders when cruising at a constant speed. No other V-8 truck of similar weight can do that (except another GM with AFM). I could just transfer over the AFM lifter cover, but it is really nasty on the bottom side & I do not want to risk damaging this replacement engine if it is loaded with debris from the lifter & camshaft failure. September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. It is usually first noticed during highway driving. (Non-AFM engines have a smooth cover.). Thanks. Sylinder one lost compression on my 09 5,3. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. The collapsed lifters will not engage the pushrods and both valves remain closed. Is there any reaction to the disabler when pulling a boat or trailer? I quites down to nothing after running for about a minute. Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. Once the lifter has been damaged, the cam is probably also damaged. Dont want to make a move on a new truck or jump to a 2500 yet. New plugs and wires. any help? Constant engine and transmission problems. The biggest problem is nobody changes their oil on time. It seems this tough engine has everything incorporated into it. Is this the shield you referred to in a past post? Next day, fired it up to take the the junk yard and it ran great. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. changed oil , its all working now, but want to disable this sorry system. Another option is to plug it entirely if the AFM is already removed. .or something similar . Having a hard time finding one .. https://www.cargurus.com/Cars/Discussion-t30884_ds822284. Anyway that horrible experiment was in the late 70s early 80s along with those converted Diesel engines..those like the 8-6-4 nonsense were just terrible failures. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. GM uses 3 different styles all are engine specific. My Wifes 17 Buick with afm was my attempt to get back to gm. But then she passed away from cancer. Any thoughts or suggestions would be appreciated. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. Definitely dont want to do anything to fix one problem and create another. But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. I know a few guys with Tundras. When we removed the oil pan from the new block, we noticed a metal shield covering the bottom of the block. Getting 20 mpg in town and 24-28 mpg highway and love the truck now with these mild tweaks. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. Brian, thank you for the quick response. As a side note, the early ones had a 24x reluctor and plastic chain guide (good) vs. the later ones with 58x and the spring loaded tensioner (not so good).

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