Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. Some guys have been able to use a tool through the top with the cover off to get it to release. These trucks cost too much to have a terrible product. I am going to do the full repair of the engine now, but not an overhaul (too hard to get at the pan). Was a disaster then but a profitable disaster. Since no air can get in or out, four cylinders provide no power. Yes thats true. How stupid do you have to be to whine like a welfare check cashing idiot when there are literally 3 or 4 different ways to totally disable AFM. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Whats the next step? will feel like a jerk asking the clerk at lowes to cut them again. Seems like the AFM disabler device is working for a number of people including myself as the 5.3l AFM engine has inherent design faults. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. Oil 0w or 5w -20 A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . Easier said than done. My concern is if I leave the non-AFM lifter cover in place & have nothing to plug the 5 pin AFM solenoid connector into, will I get a MIL? Send response to tkrieg@cox.net. Thanks for the detailed post! [] 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. I have read synthetic isnt good for AFM lifters. A 14 gmc 5.3 Sierra 85000 miles Hi Mike, the metal shield you noticed is probably the windage tray. Pushing forward. Some drivers want V8 power under their foot at all times. Have misfire code and engine has what I would call a surge while driving. I am wondering the same thing. Did Obama make them do this? GM should recall every vehicle with this terrible design flaw! I just got new warranty engine and dont want this issue again? Very expensive repair too! You will get codes thrown if the afm is physically removed without telling the ECM you did so. Would it be fine to go ahead with the AFM Disabler? Last GM Ill ever buy unless its got a diesel. The wife however found this deal on an Envoy Denali . The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. It has the orings in place, that seals the towers. 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. Id wait until the warranty expires then disable. 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. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. Next day, fired it up to take the the junk yard and it ran great. Once the failure has occurred, the AFM shut off methods other than that probably wont work. Any advice that you could offer would be great. I may just do that Vic. I also notice that it doesnt go into V4 when it is cold. Its not GMs choice to use AFM. How is that an improvement. 4,7 plugs foul runs rough at idle. I had to replace them all and the camshaft as well. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. Had similar problems under warranty, no telling what they rigged me up with at the dealer. This really sucks. I call it active obama fuel management .A scam . I want to put a AFM disabler in it what all do I need to have done. Engines with AFM use a high-volume oil pump. I went ahead and purchased a Disabler on Amazon, for preventing it happening in the future. 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 []. Then again, it should have never been controlling those solenoids. Constant engine and transmission problems. I would appreciate any feedback. Then changed the oil. Clean oil is crucial. The engine had 200K miles. Never did strand me on the side of the road way. Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . Todays computers are faster so it does work. There is a good chance that some of the drivers side lifters decided to go. Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . When they are locked into position, they wont wear further and cause issues down the road. Engine starts but is throwing a misfire on cyls 4,7. My question on a 2007 Chevy Tahoe 5.3 AFM NOT GOOD!! As it turned out one of the cam bearings was failing and causing the cam to wobble (my guess) which messed up the AFM and probably some other stuff too. Friend will send to me from Arizona. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. Most of all, my concern is reliability. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. Solenoids, new lifters also test voltage to solenoid pack all good their, This is what I keep telling people. The most common issue GM vehicle owners with AFM report is increased fuel consumption. I have a 12 with 4.8 Silverado 75000 miles We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Have a lifter problem on my 2010 5.3 Silverado. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. Plugs spark fine engine has power at higher RPMs although it is still in Limp mode / stabilitrack message, even after driving it a few times above 60 MPH then clearing errors with handheld programmer. I have no other engine problems and Id like to fix the issue. Its got a hundred forty-five thousand miles on it. We need availability of a replacement engine without the AFM. Hopefully more is known by then. They shift cam lobes by sliding the cam, never actually shutting down the value but riding a different lube! Carbon Build-Up in the Intake Ports. whith a disabler. Below youll see references to the L99 as a result. In other words, the crankshaft and bearings were not visible. What can I expect with the AFM in place, or, with AFM disabled (not deleted)? 330-630-0240. I have been assuming this is just a slow to pump-up lifter or lifters. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . 190k on the motor always ran AMSOIL full synth since new. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. Keith, were happy to help. I ordered a electronic disabler for it today. A 17 with 5.3. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. 2 15 with 5.3 Sierras both with 100k and Where can I buy a bolt to replace this relief valve ?? This basically deactivates the cylinder deactivation system. I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. A 17 with 5.3. 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. Thats not all bad because it saves the cost of an AFM delete kit. Should I buy one to disable the V4 mode? Although the last oil change I had they offered a more expensive oil that would let me go every 5,000 miles and when this happened I was almost at 4,000 so needless to say I will never do that again. Ever since that which was Feb/March 2020 i get a intermittent rattle does not do it all the time and I am not getting any codes i.e. Well, they move a couple of times after startup thats all.Asume its the same on syl 7 on the other side.Disconected the Connector to the solenoids, no difference. Don't even get me started on the shortened life of the cooling, starting and charging systems. All Gen IV engine blocks haveAFMtowers and oil passages cast in. The Service Traction Control and Check Engine lights also came on again but went out after a few minutes. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. Install ls3 valley cover. The lifter came apart and chewed up the lobe on the cam Im selling it I also told my friend at work when he asked me about my truck .I said Ill never by another GM ever. Now I get 24 to 26 with deactivation locked out and full power. 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. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. More information can be found in the GM TSB bulletin number 10-06-01-008g. Thanks. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. I guess I might have to call a dealership or GM to get a definite answer on this one. Correct me if Im wrong- If such an item was available couldnt you then just replace the lifters in the 4 AFM cylinders and then just run a disabler or have your ECM/PCM reprogrammed to have AFM disabled permanently. The engine will normally operate on 8 cylinders in V8 mode during starting, idling, and medium or . If I put my truck in manual 5, it doesnt try to go into V4 mode. The LZ1 was upgraded with AFM and []. Its ribbed with solenoids on the underside. With the nipple, or without? Having a hard time finding one .. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. I have a 2012 Chevy Avalanche. Thanks. In 2010, GM added a deflector (p/n) NAL-12639759 to redirect in into the pan. As you said, the ECM was never seeing the AFM so I think youre good to go. I love the car so far. I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. Hello Brian, I just purchased a 2018 Silverado with a 5.3 AFM engine, I have 200 km on it. They have plastic casing, so you can imagine what will happen with aged plastic. (Bought car 1 day before lifter died!) The engine also had 799 or 243 casting heads which are closely related to the LS6. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? Are you saying that I am in the clear by a year and issues fixed? 8000 grand for the repair mine was 1,700.00 to repair, I had a 2004 small block v8(4.8) 331,000 miles on the truck,it was the usual on the maintenance front axles,etc. You could also have tried that if the trans oil didnt work. Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. Fouls those plugs. another common cause for low OP is the oil pick up tube O ring. Install the AFM disabler now or wait until my warranty just about to expire to get this AFM issue resolved? It was good for about 10 miles and started with same loud knock noise. This happened on a camping trip with my kids last friday night. Hi Grant is that disabler still working for you ? Is this the shield you referred to in a past post? We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. It is replaceable.. just remove oil pan and it will be on top at the filter. 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? It essentially turns your V8 engine into a V4 which saves fuel. Now the problems back, I have 180k miles on it now. My daughters car had about 230,000 miles when she complained of the problem. Or not because it is the cast iron block and not he aluminum block? 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. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. No other V-8 truck of similar weight can do that (except another GM with AFM). This is in response to pretty much everyone. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? Should I buy a Diablo AFM disabler to prevent the new block from dropping to 4 cylinder? All these comments on the 5.3 are blowing my mind!!!. That might show up if you cut the filter and looked for debris in the pleats. [], [] LS Tech: How to Delete VVT or DisableAFM []. Would doing the disabler option once I get it back be the right one? You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. When you eliminate the AFM system, the extra oil is no longer needed. In the mean-time I found that you can keep the engine from going into 4 cyl mode by using the manual shift (if so equipped) and keeping it out of 6th gear. Just pulled it down in the garage there was no other damage , luckily. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . Very confusing stuff out there. Drives way better for my mostly paved road driving. I am trying to find out of this is true. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. Here are a few of the issues that you'll want to keep on your radar if you drive a 2017 Chevy or GMC vehicle with a 5.3L engine in it. Cylinder Deactivation to the Rescue. I can literally drive from Seattle to Redding CA on one tank. 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.
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