In four-cylinder mode, they act like air springs and allow for smooth operation. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. hi brian when you replace the lifters do you have to change the guides also? Your email address will not be published. Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. Engine oil pressure is fine. What type of disabler did you go with? Is this the shield you referred to in a past post? I have no other engine problems and Id like to fix the issue. Brian, we have a 2007 Yukon Denali in our shop with a 6.2L v-8 that has suffered a lifter failure with camshaft damage. They replaced all the lifters, said no other damage, problem lifters were on cylinders 6 and 7. AFM - active fuel management strategy which deactivates the lifters on specific . 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. When you eliminate the AFM system, the extra oil is no longer needed. Looking for another Toyota at this point to match my 1985 4 runner with 380.000 miles and no issues since new. I just bought a 2015 5 3 17000 miles I was thinking about eliminating the 4-cylinder if I delete it with just the programmer will it hurt my motor? But if you dont like it. 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. 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. GM should recall every vehicle with this terrible design flaw! Very confusing stuff out there. Have not had a problem yet. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. My 5.3 is. Thank you for your time. Dod is the biggest failure sence the 8-6-4 caddie in 1981. I can literally drive from Seattle to Redding CA on one tank. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. But not sure very annoying. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? GM tried this on cadillacs about 20 years ago and if memory serves me correctly it was a disaster. It will show up as a misfire code in a cylinders 1,4,6, or 7. [] they have a downside? Ketil, let us know what you find out. Most of all, my concern is reliability. Hi Brian please help, yesterday after ice fishing was climbing a hill back home and check engine light flashed. Unfortunately because of emission standards nowadays, manufacturers cant go back to those style of engines. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Engines withAFMalso use a special camshaft, a high-volume oil pump, and a pressure relief valve in the oil pan. We did take it apart to check for metal possibly being trapped inside, it looked like brand new. This lowers the cost of building it [], [] aluminum block engine. Drives way better for my mostly paved road driving. Then changed the oil. Im crossing my fingers it does the trick! Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. We need availability of a replacement engine without the AFM. And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. This is what I keep telling people. Don't even get me started on the shortened life of the cooling, starting and charging systems. .or something similar . I ran 0W-20 no more the 5000 miles between changes. What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? 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. Teflon coatings does not last. When cylinders are deactivated, the number of crankshaft rotation increases between firing pulses. However, the fuel savings are not always as much as expected. When they are locked into position, they wont wear further and cause issues down the road. is it still working good since you have done that with the trans fluid? I got a 09 Chevy Ive had the 1 go out then the 7 about 2 weeks apart if I known what I know now I wouldve changed them all at once but now I have a misfire on cyl 4 but it came back in why are these lifters going out one at a time like this the 1st two that went out I was coming off the interstate an stabiltrack came on now the 4 misfired twice both times pullling out my driveway. Definitely dont want to do anything to fix one problem and create another. He used seafoam and changed to synthetic oil. 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. It was in the late 70s or early 80s and it was a POS, Your memory serves you pretty well I too have the same nightmares lol. This is in response to pretty much everyone. WATCH THIS VIDEO https://youtu.be/1MJMf3nnQhQ. Every one of these engine will have a lifter fail, this is a travesty! The most common issue GM vehicle owners with AFM report is increased fuel consumption. I asume low oil pressure cant make some of the DOD lifters to malfunction? Another option is to plug it entirely if the AFM is already removed. I am leaning heavily on installing the AFM disabler. With that said, the current global chip shortage has been affecting the industry on a wide scale, forcing production halt among several automakers. But it also restricts passages that the oil runs through. I will be installing the AFM deactivator tonight when I get hoe. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. I know I felt the same way. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM They may be able to find some of those missing ponies. 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. http://www.autoserviceprofessional.com/article/91652/ticking-gm-v8-lifters-and-dtc. But after reading this thread, Im a little concerned about the long-term reliability. Why cant you stop the send signals from the computer so that the solenoids dont open and the AFM system is never engaged? This basically deactivates the cylinder deactivation system. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. will feel like a jerk asking the clerk at lowes to cut them again. The computers had not evolved enough to control the sytem. Now you tell me AFM works and I will tell you; that you are full of shit! Cylinder deactivation works to save fuel, but it may not be for the reasons you think. 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. Driver reported this occurred suddenly while driving down the highway. So I did the job one more time. Only running on drivers side cylinders. There is no way cylinder deactivation and the resulting temperate decrease, with sudden piston heat expansion when all cylinders are engaged, can't have undo wear and tear on the rings, valves, piston and bore. New plugs and wires. Im always sorry to hear when people run into issues like these. AFM or active fuel management is a GM/Chevy technology meant to improve gas mileage. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. If under the truck while parked and it is doing it it sounds like it is towards the back of motor. I just took a long trip and it used 1.5 quarts of oil. 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. Any help would be appreciated. Do not pay that amount. I havent has any lifter or cam issues. I have a 2011 GMC Sierra 1500 with the 5.3. Love the truck. When you drain the oil at three to four thousand miles its still clean. When an engine is contstantly running on oil that is broken down, it not only wheres out components because of no protection. We had one for a company car in 82 and it never did run right from new but at least it didnt destroy itself. how many miles do you have on your engine? You can monitor the oil level on your dipstick for 3,000 miles to determine if the deflector or plug would be needed, but chances are you wont based on the TSB. Have a lifter problem on my 2010 5.3 Silverado. 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. Shame this happened. Are there errors or something only the dealer can clear? These trucks cost too much to have a terrible product. [], [] 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. Accept i only have 60K on my truck and it hasnt recovered. Can you tell me what needs to be done with the VVT? General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. An electromechanical system deactivates and reactivates all 16 of the engine's hydraulic valve lifters, controlling valve actuation. Vehicle has been serviced more regular than the manual calls for and the AFM has caused problem after problem with fouled plugs. Is there any potential down-side to doing this in other words, might this do more harm than good? Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. I always have done my oil changes on time, not sure about the people who owned it before me though. Ill Never Ever buy another gm. 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. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. Is there any reaction to the disabler when pulling a boat or trailer? This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. stalled in a certain way a warning wouldn be a bad idea. . I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . 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. Theyre also notorious for bad cam tower oil leaks. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. Your 1981 caddy was your fmu I got glue inside of it and it stuck the potentiometer for stochiometric if you get a new fmu or you pick the glue out of the potentiometer you can set it to stoichiometric and get a lot better fuel mileage as far as your truck why dont you look at the intake manifold I got a crack or a vacuum leak somewhere for gas mileage thank you truck service, Near 1981 its your fmu it has glue inside the potentiometer you have to either RNR it for a new one or pick the glue out of the potentiometer for stochial magic is the only variable resistor inside that you can turn with a screwdriver once you get the glue out of it itll read still kill metric just be careful and then you can set it properly with your own meter on your monitoring your O2 sensor and then on your Silverado thingy your 5.3 just check the intake manifold for lakes Ill get you a better gas mileage if you dont have any intake cuz theyre plastic and they crack and stuff like that other than that yeah thats it, Larry Jenkins, I have a 17 GMC Sierra 6.2 SLT, I got 25 to 27mpg regularly with 93 gas and cylinder deactivation. My dad ended up running seafoam through it and some transmission fluid, changed the oil pressure sensor which I definitely think was bad and also cleaned out the little screen and he said it was so full of junk and metal scraps. I have a 2011 Chevy Tahoe with the 5.3 Gen 4 LS (VIN Code 0) and I bought a CAM motion DOD/AFM delete kit, 3 bolt drop in CAM Motion stage 2 camshaft, VVT delete kit and finally a Diablo Predator 2 Premium for GM programmer. I have a 12 with 4.8 Silverado 75000 miles For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM).
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