gm cylinder deactivation problemsUncategorized

The exhaust valve remains open during the intake stroke and closes just before BDC. 1981 Cadillac V 864. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. Covers me to 100K. Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? It is usually first noticed during highway driving. 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. NOTE: Some parts are not legal for use in California or other states with similar laws/regulations. . Ive read at many websites that the GMCs envoys, Chevys and saabs did start to come with AFM in 2005 with the LH6 motor,It says here it started in 2006 on the saabs, then the pick-ups got AFM in 2007. It came back on last Wednesday starting with a flash. 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 have driven it now for 2 days without issue but I am having the AFM disabled/tuned out today. CHANGE YOUR OIL!!!!! So I did the job one more time. Remembered that after I bought my Tahoe. 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? Next day I drove my car to work and was fine but when I left work all lights came back on and terrible noise in the hood. Cost about $250, but it is not fool proof. The engine will switch to operating on fewer cylinders when cruising at a constant speed. General motors sent out a service bulletins to their dealers however, all dealers will not tell you about the bulletin. I have seen more internal engine failures in the last 5 years or so than I have in the first 15 years in the business. Chevrolet 5.3 Engine Issues and Recommendations 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. Also, it is the easiest way [], [] for the 2010 Chevy Camaro SSis also a Gen IV 6.2L aluminum-block V8, but with the addition of Active Fuel Management and Variable Valve Timing. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. If I had wanted a 4 banger I would have bought one. in your opinion will this work, i really dont see any reason it wouldnt. [] 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. Some drivers want V8 power under their foot at all times. 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. Its got a hundred forty-five thousand miles on it. I ave noticed the point about excess oil spray. Since it is not costing me anything out of pocket, I did not go with the Delete Kit (did not want to spend the money). Can I (should I) also change to a standard volume oil pump? Now the problems back, I have 180k miles on it now. I recently bought a 2018 Silverado 5.3L with AFM. Why have you not gotten a reply from Mr Nutter, Buying a Silverado 6.2L. I didnt even think about AFM until I got to drivee it on the highway and encountered the 4 cyl syndrome. 2012 5.3 Tahoe AFM, #4 lifter collapse,replaced all lifters,started engine ran ok, then rough, got #6 misfire code. 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. If I were to put a 2006 5.3L in a 2007 Avalanche and buy the unit to plug into my OBD2 port would it work? The Oil pressure relief valve deflector added in Oct. of 2010 is small and its part number is NAL-12639759. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. 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. Brian, I have the same question as Scott. Thanks for the advice Brian! Had similar problems under warranty, no telling what they rigged me up with at the dealer. This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. Unplugged AFM engine only runs on 4 cylinders #2,3,5 and 8. Nine plaintiffs filed the General . I asked my local Chevy dealer, from whom I purchased the engine, to find out why the oil pan lacked the fitting. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. Pod. Do you think I can still disable AFM? My daughters car had about 230,000 miles when she complained of the problem. These engines made 270-400 hp from the factory will run smooth as silk for over 300,000 miles (unless you have AFM). The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. No problems with any to this point. they are known to become plugged. Yes, always change all the lifters at once. The engine will operate on 8cylinders, or V8mode, during engine starting, engine idling, and medium to heavy throttle applications. Brian, I just purchased and installed a remanufactured L76 AFM engine for my 2007 Suburban. For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). My Chevy truck with fuel management can not touch my 2000 Chevy with out fuel management. Change your oil. Only running on drivers side cylinders. Toyota has their own problems. Would never take it on a long trip. However, the fuel savings are not always as much as expected. My 2002 I had over 298K on it with no engine related issues. The GM 2.7-liter L3B Turbo four-cylinder engine for Chevy Silverado and GMC Sierra pickups is meant to change minds about power and torque in a small package. One the other hand, it came without AFM, VVT, or flex fuel capability. AFM works by deactivating half of the engines cylinders under certain circumstances to reduce fuel usage. Once I get it back, could I install the Disabler safely. Given that, would you recommend buying one of the OBD-II devices to disable AFM? We were getting a code that the cam position sensor was not functioning properly. Now you tell me AFM works and I will tell you; that you are full of shit! Bought an 07 GMC Yukon 5.3 with the AFM, 87k. I also have 08 Burb, but have different symptoms (high oil consumption, blue exhaust smoke at start, and now a really rough start after sitting overnight). Also I dont recommend doing this as you may be in violation of some emissions standard or manufacturers ethics code . No problems with any to this point. However, they are only functional on engines that usedAFM. [], [] LS Tech: How to Delete VVT or DisableAFM []. They are being forced by the feds to use stuff like AFM to meet the CAFE requirements. 2018 new truck has me really disgusted If I had checked this out better, there would have been one less POS Chevy sold last year ! But not sure very annoying. Never again, except for my gen4 Z28 that has a perfect engine/trans on an otherwise rolling pc of gm crap chassis. Love the truck so far. All New lifters were from AC delco. It is also known as Displacement on Demand (DoD) or cylinder deactivation. I have a shop 39 yrs . Id try the disabler and the screen cleaning first and do the AFM delete if that doesnt solve the problem. I would appreciate any feedback. I have a 2012 Chevy Avalanche. 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. An AFM Disabler is an electronic device that plugs into the OBD-II port, under the dashboard. I have a 2011 GMC with over 162,000 miles on it and it runs great! Any guidance would surely be appreciated. With the AFM tuned off, it shouldnt be trying to switch over to four cylinder mode. Better airflow reduces drag on the pistons and the associated pumping losses. Apparently all passkey III keys are not the same,, I bought one that said for 2006 impala assuming all pk3 would be the same, and I could not get it programmed in my saab 9-7,, so how Im waiting on ones that specially said for saab 9-7. hoping they will work. Are you saying that I am in the clear by a year and issues fixed? NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. Having it fixed now, just curious Seems like a problematic design. You may want to update your post. I havent has any lifter or cam issues. It has has 9000 miles and no lifter or other issues or codes so far. Not sure what else it can be. Replaced all lifters. the body is in great shape. I called my service station and they told me to get it in ASAP. It is being covered under warranty since I only have 72,000 miles on it. There are 5.3 cylinder deactivation problems that can occur. Having a hard time finding one .. When you don't need the full power of the engine, it provides better fuel economy." Just shut AFM off. Just recently, GM announced a temporary closure. $8500.00 fix. But if you dont like it. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. I have a 2014 Silverado with a 5-3. [] cherry on top is that it isnt saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Happened to me twice 2009 Silverado, finally deleted DOD and installed a performance cam and lifters. Just one. Found that all passenger side cylinders are not firing. please respond with your opinion. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. Learn how your comment data is processed. Is the Pressure relief valve replaceable? I have an 2004 1500 Suburban 4WD that I am about to replace the motor in. You are correct. 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. A 17 with 5.3. The VLOM consists of 4 electronically operated solenoids and is bolted to the top of the engine block beneath the intake manifold assembly. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. To do this, you need to leave the AFM solenoid pack connected to ensure no codes are thrown. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . This valve is located on the oil pan rail and prevents excessive oil pressure from negatively impacting the AFM components. Install ls3 valley cover. Engines with AFM use a high-volume oil pump. I wont bother with blocking the relief valve. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. Engine starts but is throwing a misfire on cyls 4,7. Regarding the cylinder deactivation impact on fuel consumption . Took the heads off again. Is this due to the AFM being shut off? I have a 08 6.0L out of a Silverado with an aftermarket oil pan that has no provision for a pressure relief valve. 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. Runs better than new now and no more oil consumpsion!! 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. If I put the Range module on, is that all I need to do, both now and long term? Double digit MPGs in my 98 K1500 would be a dream lmao. . I would. Good point which begs the questuion, why does the Service Stabilitrak error seem to coincide with lifter failure? . put tran fluid in oil for a day till lifter became active, had to change the fouled plug. I got as high as 23mpg on the highway in my 89 K1500 with 350ci and a five speed manual. Welcome to socialism folks . Question i just bought a 2005 Saab 9-7 with 5.3 v8, (same as GMC envoy) which came with AFM, the car runs fine, so if i just install the OBDII electronic device, is it just as likely that my lifters will still go bad? I am hoping this does the trick. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? I just got new warranty engine and dont want this issue again? another common cause for low OP is the oil pick up tube O ring. Jasper makes aGM engine that deletes AFM & will warranty the engine to a 100,000 miles parts & labor . We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. 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. Thanks for your help. Engine oil pressure is fine. 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. Sylinder one lost compression on my 09 5,3. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Keith, were happy to help. I may just do that Vic. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. I had to replace them all and the camshaft as well. I had #4 lifter stick and now i am looking at replacing the engine with a non-dod version. Absolutely agree, but we all know GM cant afford to recall them all & definitely wont, gettin a Toyota, but first will go to GM dealer and ask to see a truck without AFM & when they say they dont have it Ill say See ya, I have an appointment with the Toyota dealer! Always had GMs never anything else till now. Id wait until the warranty expires then disable. So for all of you that continue to complain about how bad these things are. Regardless of the AFM solenoid being commanded on or off. You were lucky that it worked. We chickened out though and just bolted the AFM solenoid plate onto the used engine. Don't even get me started on the shortened life of the cooling, starting and charging systems. Please report back if you have any issues, but I think you are in good shape. The LFA was upgraded with AFM and [], [] improvement over AFM, DFM has 17 different cylinder firing patterns and switches seamlessly between them to provide just []. There may be an ignition related issue on that cylinder. I could just transfer over the AFM lifter cover, but it is really nasty on the bottom side & I do not want to risk damaging this replacement engine if it is loaded with debris from the lifter & camshaft failure. Mine did at the exact same time. I tried the trans fluid in the oil. If a shop pulled a DTC code P0300 and found AFM to be the issue, it may not be too late to try the disabler. I only had 81k on the motor. Would doing the disabler option once I get it back be the right one? As GM issued 13 updatesnone of which workeddealers disabled the system on their customers' cars, leaving them permanently in V-8 mode. I had an 82 caddy 4100 with alumn block and cast iron heads ,, Exploded in Philidelpha, Garbage.. Teflon coatings does not last. 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. You will be placed in derate if the ECM does not see the correct resistance from the ATF intake. 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. Then again, it should have never been controlling those solenoids. 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. This allows the engine to run in V8 mode. Now Im here tring to figure out what to do. How about if they just let us have a manual transmission agains for fuel mileage? The biggest problem is nobody changes their oil on time. It also mentions a valve cover replacement with revised PCV valve design. Did gm make a non-dod version of the 5.3 with iron block that would work in my application? I did a delete on an 07 avalanche and no have no power, any thoughts on what might be going on? Corvette that does employ AFM. Replacing engine due to issues caused by AFM. . Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? You can search our site by engine code to find some of the upgrade articles weve published and more are on the way. With 40000 I have a 12 wit 4.8 Silverado 75000 miles Should I buy one to disable the V4 mode? Or is the shuddering indicative of failed/failing lifters that need to be replaced before moving forward? Verified over hundreds of trips, makes no sense. GM switched over to the 4100 v-8 in 1982. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. Oil flows to the special lifters through theAFMtowers. IMHO . I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. 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??? Will this AFM DISABLER damage anything???. September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. Some guys have been able to use a tool through the top with the cover off to get it to release. Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. I wii be using this truck to haul a camper for full time RV living and am thinking of a tuner to shut off AFM and maximize performance and economy. Any problems to watch out for?Did you replace the VLOM? Active Fuel Management (AFM) is a trademarked General Motors technology that improves gas mileage by shutting down half of the cylinders under light-load conditions to reduce fuel consumption. It replaces the AFM components with standard parts. I have a 2014 Chevy Z51 [w/dry sump oiling etc.] With the nipple, or without? 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? Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? AFM - active fuel management strategy which deactivates the lifters on specific . The trucks are only supposed to use two four. The only solution is to replace the entire cylinder head. 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. It essentially turns your V8 engine into a V4 which saves fuel. Also replaced push rods rocker arms and rocker plate guide because if wore push rod and crack in rocker arm. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). Perhaps a flaw by design would be a more appropriate description . The LZ1 was upgraded with AFM and []. 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. 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. Most of the complaints show up in the 2009 to 2011 model years. I have a 07 Yukon with 180K and no issues what so ever. 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. Just pulled it down in the garage there was no other damage , luckily. Brian, I repaired a 2012 GMC Yukon Denali as the AFM lifter on #4 I take failed. Still have no power. She started to have the lifter problem again after 60,000 miles more. Getting ready to diy for $450. The oil is baked on to every component. My fear now is not will it happen but when! HP tuners is not for someone like me that doesnt know how to use it and from what I read neither the range nor diablo plug and play device will work since the buicks pcm files are different than all other GM vehicles that came with afm because it was tuned in house at gms performance division. Thank you. I have the towing package on my 13 Tahoe LTZ. I saw two Summit Racing kits, with different valley coverswhich one do I need for my Yukon? The engine is running on only four cylinders. Most will want to get rid of the AFM immediately. We need availability of a replacement engine without the AFM. I recently bought a low mileage 2013 Silverado and the lifters collapsed. 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. 50,000 miles. Chris, when you did your delete, did you also change the cam at the same time? There is a chance the cam lobe was stressed and started to deteriorate. I have a 2011 GMC Sierra 1500 with the 5.3. Im praying that my RangeTech buys me a few years. 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. 1. The materials used in the engine were [], I have a 2018 GMC with the Eassist and AFM 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. They are taller and have special oil holes. It depends on the failure mode of the lifter however, certainly worth a try. .or something similar . 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. AFMis good for gas mileage and can be 5-7 percent more fuel-efficient under certain conditions. I have no other engine problems and Id like to fix the issue. Thanks. I am having that done today on my 08 Suburban and its only costing me $225. This lowers the cost of building it [], [] aluminum block engine. This is what I keep telling people. 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. Wynnewood Football Field, Preston Magistrates' Court Cases Today, Was There An Earthquake Just Now Near Vallejo Ca?, Articles G

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