The 2016+ Tacomas are junk. GM's Active Fuel Management (AFM) works under certain light load driving conditions to maximize fuel economy by deactivating 4 of the engines 8 cylinders. We figured we already had the intake manifold off to install the engine, why run the risk of MIL only to have to removed the intake manifold again without being paid. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Looking forward to input from the forum, Thank you.
How to Fix GM's Cylinder Deactivation Problems 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. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. Any problems to watch out for?Did you replace the VLOM? All ready done valve job . 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. Once I get it back, could I install the Disabler safely. Don't even get me started on the shortened life of the cooling, starting and charging systems. Took it in this morning and mechanic said cylinder 6 misfire, he said the lifter hasnt failed. But it also restricts passages that the oil runs through. Diablo says yes but they do not provide tunes. December 20, 2021 A GM lifter recall should allegedly be ordered for Buick, Cadillac, Chevrolet and GMC vehicles equipped with 5.3L, 6.0L or 6.2L V8 engines. Regards, Most will want to get rid of the AFM immediately and VVT isnt for []. I wouldnt trade my 2000 Silverado, 5.3 liter that has constantly gotten 20 mpg since I bought it 15 years ago, for a dozen of these new $50,000 POS. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. Is the Pressure relief valve replaceable? GM get a clue! Would doing the disabler option once I get it back be the right one? I have no clue what to do now. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? Now it appears GM and their handlers want to push the electric market with throw away junk that is mechanically weak . I couldnt agree with you less, yet I respect your opinions. Ditto , never buy a throw away vehicle again is my recommendation and my fix . 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. We chickened out though and just bolted the AFM solenoid plate onto the used engine. IMHO . Hi Grant is that disabler still working for you ? Is this an issue only with GM SUVs and trucks, or does it include cars too? 190k on the motor always ran AMSOIL full synth since new.
Why does GM's cylinder deactivation cause lifter failure? 2 15 with 5.3 Sierras both with 100k and Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. TheAFMcylinders are opposite of one another in the firing order. But after reading this thread, Im a little concerned about the long-term reliability. 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. It prevents the computer from switching over to four-cylinder mode. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. Replaced all 16 lifters due to collapsed lifter on CYl #4. All Gen IV engine blocks haveAFMtowers and oil passages cast in. Your email address will not be published. The only problem is the extra spray on the cylinder models if a deflector isnt used and this can show up as increased oil consumption. i just bought a 2018 Silverado with the 5.3 The early part of his automotive career included working for engine builders Scott Shafiroff and C.J.
GM 6.2 Active Fuel Management Problems: What They Are and How - CarAraC I love the car so far. [] 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 []. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. Just recently, GM announced a temporary closure. 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. Why this happens is a more . I just got new warranty engine and dont want this issue again? A lot of drivers reported losing 2-4 quarts of oil in between oil changes. My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. will feel like a jerk asking the clerk at lowes to cut them again. Every one of these engine will have a lifter fail, this is a travesty! AFMengines use special lifters for cylinders 1, 4, 6, and 7. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Plug the tuner into your GM vehicle's OBDII diagnostic port, and follow the instructions provided to update the engine control module's program The new program will make sure that AFM never engages. I am considering the same. 4,7 plugs foul runs rough at idle. According to some experts, switching to cylinder deactivation reduces the emissions high somewhere between 4 and 10%, which is a huge percentage of saving the air from pollution. Was thinking maybe I could trick the ruck into thinking the engine was not warmed up, however, this might cause some problems for other processes, such as mix ratio and timing. 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. I always have done my oil changes on time, not sure about the people who owned it before me though. When they are locked into position, they wont wear further and cause issues down the road. 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. Service manager said nothing else needs to be replaced because the engine has a Teflon coating. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. in your opinion will this work, i really dont see any reason it wouldnt. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. I have a 2007 Gmc Envoy Denali with LH6 cant find a good LH6 engine but I found a 2011 LC9 engine w 52000 miles will everything plug up or what am I getting into? Corvette that does employ AFM. Just one. Had similar problems under warranty, no telling what they rigged me up with at the dealer. Yes a poor design but a flaw ? When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. 1. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. 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. My question is: do I install the electronic disabler on the new engine to avoid future issues? I told her to never pull the gadget out. . Should I buy one to disable the V4 mode? If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). Most of the complaints show up in the 2009 to 2011 model years. Id wait until the warranty expires then disable. [], [] rugged iron block 6.0L came with VVT, but without Active Fuel Management, which saves you the cost of an AFM delete [], [] The LH6 engine is a 5.3L Gen. IV aluminum engine that replaced the LM4 in 2005. Everything was fine for two weeks, ow customer complains s it same noise it made as before. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. Never did strand me on the side of the road way. Looking to tear down myself. Many people find the four-cylinder sound annoying if their vehicle is equipped with a louder aftermarket exhaust. Since the tranny oil worked, you should now change the oil, right? Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. Drives way better for my mostly paved road driving. NOT GOOD!! 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. 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. My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. NOTE:If you were in a situation where youve installed the AFM delete kit, but dont have access to a programmera disabler can still be a viable option. I had to replace them all and the camshaft as well. Installed them again, all facing upwards, will know tomorrow if that was the solution.If this is the cause i cant beleve why they arnt build so that it is impossible to install them the wrong way in the plastic holder.And altso that there was no warning or installation advice With the New lifters.If these are the only lifters in the Whole world that must be in Dummy Me thought gm learned its lesson in 1981 but they never did and I Too am stuck with a Buick thats just waiting to self destruct. This allows the engine to run in V8 mode. Thank you. I called my service station and they told me to get it in ASAP. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. I have a 2012 Chevy Avalanche.
The 5 Most Common Chevy EcoTec3 5.3L Engine Problems Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. Engines with AFM use a high-volume oil pump. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. 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. Then I guess I have to spend a bunch of money and get the delete kit. Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . 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). It works .
chevrolet - How does cylinder deactivation work? - Motor Vehicle WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. Thankfull for any ideeas! I can tell you for the past 2 years I changed out my LC9 5.3L fully synthetic oil every 3,000, even though Mobile Oil claims 10,000 miles or more. 2 15 with 5.3 Sierras both with 100k and