Carbon Build-Up in the Intake Ports. I loved this rtuck until this happened!! Love the truck. I have a 2011 GMC with over 162,000 miles on it and it runs great! I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Truck has an active P0300 code and runs very rough. Right now I have just over 77K miles with no lifter problems Knock on wood I am thinking of the AFM disabler. 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. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. Some guys have been able to use a tool through the top with the cover off to get it to release. Thanks. Im looking at the Range Disabler but want to make sure it is required/suggested/recommended/safe? Ive been reading, with disgust and concern of the lifter/cam situation. Id wait until the warranty expires then disable. But it also restricts passages that the oil runs through. After reading these forums Im a little concerned about my decision to stay with GM. RANGE TECNOLOGY.COM. It uses a M14 x 1.5 thread plug like Dorman 65217. If I had wanted a 4 banger I would have bought one. When I first bought my newer truck with fuel management, the GM tech at the dealership told me; if I wanted the engine to live a long life keep the RPMs below 4500. It is replaceable.. just remove oil pan and it will be on top at the filter. CAM motion says no just have to disable the AFM and VVT with a stock tune as the camshaft is not an aggressive camshaft but a drop in. There is no light on my dash or anything that indicates the system is active or exists, so its very confusing, Im still not sure if my vehicle has it or not. Send response to
[email protected]. How did your turn out? 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. 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. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. We chickened out though and just bolted the AFM solenoid plate onto the used engine. It will show up as a misfire code in a cylinders 1,4,6, or 7.
How to Fix GM's Cylinder Deactivation Problems This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. Im servicing a 2011 Chevrolet 5.3 with AFM. Better airflow reduces drag on the pistons and the associated pumping losses. I did and they diagnosed it as being on Cylinder 3, not one of the cylinders that deactivates. This basically deactivates the cylinder deactivation system. It also has an electrical connector on the back. I have an 07 Silverado 1500 ltz. Are you saying that I am in the clear by a year and issues fixed? Whats the next step? 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? You cannot compare them to old 350s. I have had some say that it is the valves and others say that it is the cats plugged. I hate it. She started to have the lifter problem again after 60,000 miles more. Does the Pressure relief vavle ever go bad?? Bought an 07 GMC Yukon 5.3 with the AFM, 87k. Glad I did. Then had to drive the truck back to Tampa from Cheifland Fl. (Non-AFM engines have a smooth cover.). Hi my name is noel I am a mobile mechanic and I have a client that was having trouble with the lifters on a 2011 gmc yukon Denali 6.2 I placed the lifters after finishing I still had a problem with cylinder 8,6,3 rocker arms were not moving so I replaced the cam OEM part but still having miss fire on cylinder 6 what should I do to get rid of this problem, [] computer cannot switch over to four-cylinder mode. Double digit MPGs in my 98 K1500 would be a dream lmao. But then she passed away from cancer. Toyota has their own problems. In 5th gear on deceleration and 99 for fuel mileage estimate on the dash it still didnt go into 4 cyl mode. Driver reported this occurred suddenly while driving down the highway. One must anticipate this. I cant really tell from driving. Thanks for the advice Brian! All Cylinders. hi brian when you replace the lifters do you have to change the guides also? I have a 12 wit 4.8 Silverado 75000 miles 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. They are taller and have special oil holes. [] Here is a guide on how to turn off AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Guide to disabling AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] Here is an article on how to deactivate AFM. This video covers the steps youll need to take before upgrading to a larger [], I am installing a complete delete system, just wondering what it will do if dont plug the oil pressure relief valve? Dale, I have a 08 Tahoe thats doing the same thing.Any info you have on this would be appreciated, [] Do they have a downside? The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. It does seem that when they start goingthey go quickly.
The Hit and Miss Nature of Cylinder Deactivation Systems Chevy 5.3 Engine Problems (Gen 4) #3: Spark Plug Failure. A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. Fouls those plugs. Mine did at the exact same time. I traded in a 2004 4.8 L with 256000KM on it that ran like a clock and never gave me a problem. the extra oil isnt needed. GM get a clue! 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. If possible, will simply not using VVT provide a powerful,good running engine? I had to replace them all and the camshaft as well. please respond with your opinion. Required fields are marked *. You may eventually see a check engine light from a misfire code and the ECM dialing everything back to protect your engine. . 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. Now i have my mechanic trying to follow a YouTube video I saw with a guy and a rod and a hammer. 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??? Oil 0w or 5w -20 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. Is there any reaction to the disabler when pulling a boat or trailer? [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. 2 15 with 5.3 Sierras both with 100k and It looks as if Ill need to start saving for a complete AFM delete kit with a new cam. The engine will switch to operating on fewer cylinders when cruising at a constant speed. Would it be fine to go ahead with the AFM Disabler? 2 15 with 5.3 Sierras both with 100k and I would just have the AFM disabled (tuned out) then. [], I have a 2012 Silverado Z71 bought new. All eight cylinders are now powering the engine. Diablo says yes but they do not provide tunes. While the system sounded good, the microprocessors scrambled to activate, deactivate, and then reactivate cylinders as driving conditions quickly changed, causing the car to hesitate, buck, and stall. 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. 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. The market for nonhybrid gasoline-powered vehicles is expected to fall by 20 percent during that time, but with tech like smarter cylinder deactivationin these upcoming GM V-8 trucks, for . I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. My tech just installed the engine, only to notice that he doesnt have anything to plug the AFM solenoid pack into. a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. I will be installing the AFM deactivator tonight when I get hoe. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Not sure which direction to go from here. Chris, when you did your delete, did you also change the cam at the same time? Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. I have a 2012 Chevy Avalanche. IMHO . Todays computers are faster so it does work. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. Cylinder misfires (most common sign) Rough idling, poor acceleration, loss of power Check engine light with engine misfire codes Air-to-fuel ratios are either running rich or lean The easiest way to tell that you have an injector problem is through the check engine light and engine codes for misfires. All ready done valve job . I service plenty of these vehicles with AFM, and the ones I have to open up the engine for repair because of a failure doesnt surprise me anymore. 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. Happened once 1yr ago, truck was not used for a week and worked fine when i started it back up. This is my second Avalanche and I never had any issues with either of them. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. Have an intake and Borla exhaust. This system was originally used in early 1980s Cadillacs. The 2nd went with a conventional valvetrain. She had driven it for a couple of months that way. Ditto , never buy a throw away vehicle again is my recommendation and my fix . Replaced all 16 lifters due to collapsed lifter on CYl #4. 91 GMC Sierra K1500 F44 6.2 NA Plow truck with 7.5ft Leo Plow 94 K3500 CC DRW 6.5TD DE exhaust . Hopefully he can free up the stuck/collapsed lifter. Last GM Ill ever buy unless its got a diesel. Nine plaintiffs filed the General . My 97 k2500 suburban with a lightly modified 6.5L diesel gets 20ish. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. the body is in great shape.
2017 5.3 Liter Chevy Engine Problems: Be Aware of These 4 Issues! I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? Oh,the throw away vehicle has 77,000 miles and has always had meticulous maintenance . We did take it apart to check for metal possibly being trapped inside, it looked like brand new. "The idea behind cylinder deactivation is that when you're cruising down the freeway and there's low load, the engine can turn off half the cylinders and in theory burn half as much gas. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage.
Cylinder Deactivation: What Is It and How Does It Help Save Fuel? Only thing I noticed with the oil consumption issue. Only wish Id did my homework, nothing but issues, from 14,000 miles it starts this motor noise,as if lifters at cold starts, let set up for 8 hrs same noise, this noise is on the right side of engine, it lasts 5 seconds but never heard this until we had this cold spell in the state low temperatures or it was just time for this to start? When a deactivated cylinder is reactivated, the control system opens the exhaust valve first to evacuate the trapped exhaust gas, before reactivating the intake valve to allow reactivated cylinders to revert to the normal operation of the compression/combustion exhaust/intake cycle. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). . How do you know if the lifter has failed? Hello Keith, if your lifters are still in good shape, an AFM Disabler is a good idea. Chevrolet 5.3 Engine Issues and Recommendations I remember those Other GM vehicles that the consumer tested for GM and paid GM for the honor. .IMHO . Accept i only have 60K on my truck and it hasnt recovered. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. 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. 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. Took the heads off again. 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. 1. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. I dont know where to being to look for the problem. Get this, rebuild is only rings and maybe lifters. Also putting in a new transmission vs. rebuilding. It seems this tough engine has everything incorporated into it. Shame this happened. Would never take it on a long trip. Constant engine and transmission problems. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. I know a few guys with Tundras. The only solution is to replace the entire cylinder head. Definitely dont want to do anything to fix one problem and create another. it is the regulator guy! A V8 firing all 8 cylinders sees 90 degrees between combustion events, while a 4 cylinder engine lengthens this to 180 degrees. Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? Because I want to. Regardless of the AFM solenoid being commanded on or off. If a lifter has already started to fail, an AFM delete kit and non-AFM components are the way to go. It is usually first noticed during highway driving. I still get a P0336 code every once in a while but still good to drive around town. I just got a 2013 Silverado extended cab 4X4 with 124,000 miles on it. I have 217,000+ on it and it never fails meever! 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. Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. As the problem gets worse, youll hear a lifter tick and eventually you may see clearance between the pushrod and the rocker which will quickly destroy the cam. Solenoids, new lifters also test voltage to solenoid pack all good their, Is this the shield you referred to in a past post? The service manager that I spoke with said, GM states if 2 qts of oil is used between oil changes the engine needs rebuild. We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. [], [] LS Tech: How to Delete VVT or DisableAFM []. NOT GOOD!! I tried the trans fluid in the oil. Oil flows to the special lifters through theAFMtowers. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. Do you think I can still disable AFM? 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. My 2011 Tahoe has a LMG motor in it with a build date of May 2011. Open to suggestions about best course of action. Love the truck so far. If I put the Range module on, is that all I need to do, both now and long term? Can I (should I) also change to a standard volume oil pump? I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. According to CarComplaints.com, several drivers have had excessive oil consumption issues for a while from 2007 to 2011. Teflon coatings does not last. With 44, its a enormous Jon to remove the oil pan. AFMlifters have a history of failing and oil consumption can be a problem. I am hoping this does the trick. I am considering the same. Vehicle has 40k miles been maintained well and shows no signs of lifter concerns at present. This system is the most effective way to disable AFM. Then again, it should have never been controlling those solenoids. I own a reputable repair shop. It has the orings in place, that seals the towers. From what I am reading this would eliminate the possibility of failure, prevent false check engine lights and continue to make the appropriate power??? I would appreciate it if you let me know how you make out. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. It had the AFM wiring & lifter cover installed with solenoid pack in the original engine, we even removed it to inspect. whith a disabler. 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.