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. Most will want to get rid of the AFM immediately. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. The secondary pressure relief in the back of the pan began to open at 55 psi and was completely open by 75 psi. The cost of just rings $4,000.00, [] Disable your Chevy AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] like front timing cover, knock sensor location, cylinder head style (cathedral ports), AFM (Active Fuel Management), and other components are key clues to which engine family youre looking []. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . It uses a M14 x 1.5 thread plug like Dorman 65217. Would you get enough power to drive at freeway speeds? Replacing engine due to issues caused by AFM. Had nothing but trouble out of it. i have a 2007 suburban 6.0 and the number 4 intake lifter took a dive.i have already started to disassemble the engine as i plan on replacing all the lifters and reassemble the engine as i never had any other problems with it. No it runs fine on sylinder one but not on 6 or 7!!! Drives way better for my mostly paved road driving. Had similar problems under warranty, no telling what they rigged me up with at the dealer. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. Solenoids, new lifters also test voltage to solenoid pack all good their, Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. Didnt change exhaust nor tune so likely no change in power/torque. Seems my oil pressure sensor is bad, are showing the same oil pressure at all times, even when it dosnt run.Dont know it that fault was there before i replaced the lifters. Junk . Most of the complaints show up in the 2009 to 2011 model years. 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. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. It is a bad deal for sure.ive fixed a few best thing u can do is delete it in buy kit.no sense in fixing a flawed problem with the same flawed parts. I own a reputable repair shop. Ayush Srivastava There are so many more oil passages on engines these days. [], [] as the LS engine familys hybrid engine in trucks and SUVs. The most common are fuel pump failure, transfer case sensor failure, fuel injector failure, and carbon build-up. Double digit MPGs in my 98 K1500 would be a dream lmao. The Tundra fares better but the frame has the rigidity of wet spaghetti and the 5.7 has had problems with VVT solenoids and the plastic timing chain tensioners. 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. yep, you are 100% Right, I called a local saab shop and they filled me in, in 2005 the trailblazer and clones have DOD (displacement on demand), My next issue is getting extra ignition keys on the cheap. I have 217,000+ on it and it never fails meever! Teflon coatings does not last. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). I would just have the AFM disabled (tuned out) then. Any problems to watch out for?Did you replace the VLOM? I have a 2007 Yukon XL with the 5.3L and am planning to do this as my lifters have failed and it rattles loudly if it starts, and runs limp. 1. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Thank you. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. of cranking pressure because the duration is longer on those cylinders to being with to offset the AFM lifter design. I recently bought a low mileage 2013 Silverado and the lifters collapsed. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. It does seem that when they start goingthey go quickly. The problem I am facing is that I want to drive this vehicle for at lease another 77K and do not want to drive my vehicle with this AFM issue. Covers me to 100K. The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. Every one of these engine will have a lifter fail, this is a travesty! Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders1, 7, 6, and 4, switching to a V4mode. I sold them when they were new. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. However, they are only functional on engines that usedAFM. Question is, since my 2004 ECM and wiring harness were made before the AMF came about will this motor work properly as a V8 or will I need to replace the lifters, cam, oil sensor, etc as the delete method mentions? Billy, there is some interesting trivia here on the L92. 2011 Chevy Avalanche LTZ. I had one fail and it chattered the cam to the point that I had to Install a new cam. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. Is this the shield you referred to in a past post? As you said, the ECM was never seeing the AFM so I think youre good to go. 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? Below youll see references to the L99 as a result. AFMengines use special lifters for cylinders 1, 4, 6, and 7. The computers had not evolved enough to control the sytem. Give the folks in Summit Racings tech department a call (330-630-0240) and they can work on a solution for you. Hi Grant is that disabler still working for you ? Took it to the dealer and was told I had a collapsed lifter. I had purchased an extended warranty when I bought the truck new. Oil 0w or 5w -20 However I do have 7 year bumper to bumper warranty that covers this problem if I start to get lifter problems over the next 2 years.. On the other hand if get the AFM disabler installed I am pretty sure that I void the warranty from what I read on the policy. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] There has been a lifter noise since I bought the truck 1 year ago. No other truck my ass .lol my 99 silverado 1500 with the junk LR4 4.8l and 320k miles 9n itgets 21mpg all day long with 93 octane gas in it. Diablo says yes but they do not provide tunes. Thanks. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. Chevrolet Silverado 2014-Present: Common Problems Can you tell me what needs to be done with the VVT? Thats a tough call, if the warranty will cover itId let it run out. I have a Yukon 116k it now needs its 3rd set of lifters and cam. Thanks for your help. Sometimes it will do it all the time and other times can drive it for 10 miles and then it starts but doesnt do it constantly when driving. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. I have a shop 39 yrs . You are correct. Shame this happened. It depends on the failure mode of the lifter however, certainly worth a try. The Cylinder Deactivation system, known as the Active Fuel Management system by GM, shuts off some of the cylinders when extra power is not needed which improves fuel economy. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. I tried the trans fluid in the oil. [] 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 []. Yes a poor design but a flaw ? 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. Get this, rebuild is only rings and maybe lifters. But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. Nine plaintiffs filed the General . Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. Toyotas 5.7 is one of the biggest gas guzzlers among half-ton trucks. After all we bailed them out of bankruptcy. Yes thats true. That might show up if you cut the filter and looked for debris in the pleats. No clue what to do. I have also heard that the oil pump is to be changed and I have also heard that it does not matter. Because your Saab is mechanically similar to the Trailblazer, wed suggest that you are correct and no changes need to be made to the relief valve. All eight cylinders are now powering the engine. Yeh truck has 5237 miles on it It seems this tough engine has everything incorporated into it. Im a little confused on the problems too, Im reading that the 2007 pick-ups with 5.3 really had bad oil consumption and plug fouling problems, but is the 2005 5.3 that came in the trailblazers, envoys, and sabb 9-7s the exact same design as these pick-ups and prone to the same failures? It only has about 9k miles on it. Active Fuel Management About Gone From 2022 Silverado Lineup - GM Authority If you scroll back, you will find that it is recommended to change lifters and camshaft and looks some more. 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. Thankfull for any ideeas! I would appreciate any feedback. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Wow, thanks for the wisdom,, i checked my VIN Code (position #8, M=LH6) and my 2005 Saab 9-7x does have the LH6 motor with iron block, Are you sure its only 2007 & newer motors? .or something similar . This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. Install an AFM Delete Kit As a side note, Range Technologies recommends removing the disabler between visits to the dealer as they will need to access the OBD-2 port. do you fill to capacity anyways???? I have a noise in the engine but it seems to go away when revved up. . If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. Who knew? If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. i just bought a 2018 Silverado with the 5.3 Very expensive repair too! Replaced the engine with remanufactured one and had the AFM turned off with a computer hooked to the ECU. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. As we were installing the sensors prior to installation in the vehicle, we noticed that there was no fitting on the oil pan for the oil level sensor. Have a lifter problem on my 2010 5.3 Silverado. 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. Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. Here's what you need to know: 1. I didnt have lifters fail, I had the 4 cylinders 1,4,6,7 have such blow by that my choice was a valve and piston job or a new motor. 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 []. [] swaps come with an extra step or two thanks to the Generals fuel efficiency efforts (VVT and AFM). The engine had 200K miles. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . It is also known as Displacement on Demand (DoD) or cylinder deactivation. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. Just one or two. This allows the engine to run in V8 mode. I have a 2013 1500 with the LC9. It actavated the lifter? I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. She started to have the lifter problem again after 60,000 miles more. But not sure very annoying. Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors.It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy.Estimated performance on EPA tests shows a 5.5-7.5% improvement in fuel economy. Have misfire code and engine has what I would call a surge while driving. It works . What Is Hemi MDS? - MotorTrend It was good for about 10 miles and started with same loud knock noise. Then again, it should have never been controlling those solenoids. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? The original version sprayed oil on the cylinder walls and increased oil consumption. Thanks. Ive heard the Brand name Range thrown around in other forums, This is how mine started outthen 6 months later on the highway the service stabilitrak light and flashing engine light came on. I loved this rtuck until this happened!! Cylinders two, three, and eight are all similar in cylinder deactivation. []. 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. Engines with AFM use a high-volume oil pump. If you just crack it without it starting it moves all the time . They are taller and have special oil holes.