All about the C7 Corvette AFM and why its a problem

Lyle at C&S Corvettes talks about the C7 AFM and recommended options to disable the AFM.
AFM DFM Disabler on Amazon:
www.amazon.com/TECHNOLOGY-AFM...
C&S CORVETTES MERCH:
www.corvettepartscenter.com/c...
-------ATTENTION---------
As a working Corvette shop, we are unable to take every call we recieve. If you need a part or to schedule service, give us a call. However, if you have a general question for Lyle or one of our C&S Corvette techs, please use the link below to send your questions or email lyle at [e-mail] Thank you for understanding.
www.corvettepartscenter.com/p...
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www.CorvettePartsCenter.com
#corvette #corvetteparts #corvettesalvage #Corvetteservice #corvetterepair

[@Henry-sk2dr]

I purchased my 2014 with 22000 miles on it in July of 2023. I learned about this issue early in my ownership ( I'm the 2nd owner) and started using the paddles. It's the same stout A6 that was in my 2006 Corvette. I love using the paddles with the LT1. Not so much with the LS2. The NPP even pops quite a bit. So for me, this is a no brainer. Paddles rule. Thanks for the information.

[@nyernga]

I had the range device on my C7....worked as described.

[@loutruckmd]

I am a mechanic for a local Buick and GMC dealership. They make us replace the lifters on V8 GMC trucks, right of the transport truck.

[@Kevs442]

The 1st accessory I bought for my C7 is a Range. Have read WAY too many horror stories about AFM engines destroying themselves.

[@xcytibl]

Lyle, you not only hit a home run with this informative video, you hit a game-winning grand slam out of the ballpark! The amount time, effort, research and attention to detail you put into this video is quite evident and is greatly appreciated! Thank You! PS: The used set of C5 storage compartment covers I bought from you recently are working flawlessly and look great! Also, I appreciate the missing latch grommets that Steve sent me!

[@cscorvetteify]

Thank you! I do try. :) Lyle

[@loutruckmd]

I have had the pleasure of speaking with you on the phone. You are very professional and passionate about Corvettes. Every product I have purchased from you, has worked out very well. I also enjoy watching your videos, they are very informative.

[@johnxiongnu8789]

I believe. It’s GM responsibility to fix all c7 corvette default. It’s the right thing to do.

[@timmollins]

Hello Lyle. First of all thankyou for the video. The question I would like for you to answer (if you can) is the following. Given that there have been nearly 200,000 C7 corvettes produced, how many of these have experienced AFM issues? In other words, what is the percentage? I think putting real numbers regarding the problem would be helpful if this is indeed an issue…Thank-you

[@jameshicks954]

I’ve used the range device on my 2019 c7 my 2016 camaro and my 2017 Tahoe. All work great and I see no noticeable difference in mileage.

[@pilotgirl5953]

I had a 2019 C7 and never knew this! So glad I had a manual but I never heard about this... dam Whew..... Thx for this...

[@s1vrbck_fitness]

Yep, just stay out of eco mode. I have over 90,000 care free miles on my C7.

[@TheSurfRyder]

Again you keep making sense of these amazing cars. Thank you C&S Corvettes. This is C7 very important information

[@wanted-33]

I bought the Range unit for my 2016, and plugged it into the OBD of my 2019 GS before it left the dealers lot. No problems to date, and the engine is quite happy.

[@Longhorn-s7z]

So appreciated as I had no idea AFM was an issue. I just bought a 2014 C7 with 14K miles and ordered the Disabler from Amazon. Tremendously thankful for your insight!

[@243wayne1]

What color? Z51? What trim level? So happy for you and your new Vette!

[@Longhorn-s7z]

@@243wayne1 Thank you sir! Torch red 2LT w/Kalahari interior. Also has brushed bronze Rohana RXF 11 wheels. These get more attention than the car itself 🙂

[@243wayne1]

@@Longhorn-s7z Beautiful! Enjoy!

[@Spartan620]

Outstanding info Lyle, thank you!

[@bobhasslinger2510]

Informative video Lyle. I own a ‘16 Z06. After reading of several folks with Corvettes losing entire engine due to AFM failures ( lifter failure) that the RANGE product is a great alternative to “keep” the engine in V8 mode continuously. I’ve owned the RANGE for a year and have had zero problems! Bob

[@tyclawson8276]

Always helpful man thanks!

[@allanh2687]

Thanks for this information. I am going to get the Range today.

[@stevedakolios8117]

Hi Lyle, great video! Because of all of the information on the channels about the 6.2L AFM system, and my experience with my 2020 GMC 1500 6.2L (all lifters replaced over a total of 10 weeks in the shop), I brought the Range Technologies device with me when I picked up by 2017 Z06 in Pennsylvania last year. Great device - never had one problem with my engine, and in the full V8 mode I have seen 27 mpg while averaging 70 mph on extended trips. Highly recommend the Range device!

[@tomm6789]

Great video. I am trying to decide if I want to buy a 2019 C7. Not really looking for a problem. Your video was very informative. Thank you for your time.

[@sugarbea]

Thanks!

[@imdeplorable2241]

Excellent, EXCELLENT video. Informative without becoming overwhelming. Well done.👍 I own a '16 convertible Z51 and I use a Range device to, hopefully, prevent an engine problem. Again, great video. Thanks.

[@thomasgill968]

Thank you so much for you time and information I love you podcast you are so great with your information on everything you do I can't thank you enough

[@jrparker4804]

I have a C7 with the A8 transmission. I bought the Range plug-in and it works great by keeping it in V8. I also had shuddering around 50 mph but a triple flush of the transmission solved this (there is a NHTSA Alert out there about GM using hygroscopic fluid and flushing it resolves this issue). Still have the crappy lifters, but the Range device works great and I never take it out. No dead battery issues as I don’t keep the fob close to the vehicle when it’s parked in the garage.

[@oldrover3007]

Great straight forward explanation of how the System works ( or doesn’t ). Good job as always explaining in layman’s terms how these complicated experiments in gas mileage stretching are further complicating our cars ! Luckily I drive a Manual . 👍

[@harrydaniels9436]

thanks great info and video,,,,,,,and i really like that black sting ray behind you,,,,,,thanks again

[@trobertson1825]

I got a stick never use Eco mode 57500 miles no problem

[@KISSfan1973]

VERY helpful, thank you!

[@richardmarcott4343]

Advice, if you get valve rattle when the engine goes between 4 and 8 cylinders get the OBD plug in to shut it off, if you don’t there is very good chance you will detonate the top end.

[@jayfishman7694]

I had this rattle and had no idea what was causing it. I hated the 4 cylinder mode and bought one of the Range OBD modules to simply eliminate that mode. Low and behold, the rattle was gone. It was this 4 cylinder nonsense making the noise the entire time. I literally stumbled across the solution. I paid $100 for the module on Amazon.

[@Scrimmer08]

The nice thing about C6/LS3 is no AFM. That being said, I've heard the way to avoid AFM issues on all LT engines is to change the oil more regularly 5K miles max.

[@PepperFarms-vb5wg]

I believe you're correct on frequent oil changes. I have a pickup (2008 GMC w a 5.3 V8 iron block LS) with factory AFM on it that I've ALWAYS made sure that the oil is changed at less than 3000 mile intervals. At 40,000 miles I took it to a well-respected independent shop to have all of the AFM deleted, owner asked about oil changes--he told me I didn't need to do it with my oil change habits, just continue to KEEP THE OIL CLEAN/changed frequently and it wouldn't be a problem and and I now have 175,000 miles on that pickup with no problems whatsoever. BTW my C7 is a manual; I wasn't dealing with this crap on an LT engine......

[@phillipgarrow2297]

My C7 doesn't even get driven 1000 miles a year I always have the oil changed and serviced before it goes up for the winter

[@ernestbrown3690]

I have a '17 C7 Grand Sport A8. I live in Germany so i can really get on it on the Autobahn. I have also read and heard about this problem with the AFM. I heard that one way to avoid this problem was to not drive in eco mode so i do not use eco mode at all. Now this is what i watched while driving in tour mode. I had set my display to where it shows that little V8/V4 icon. When driving at a steady and low speed for while in tour mode the icon will stay in V8 mode but as soon as i change into eco mode still driving at the same low and steady speed the icon will instantly change to V4 mode. So i am confused. Has anybody with a C7 A8 ever noticed that. One more thing i have to say is that my C7 A8 is built for the european market but i can't imagine that having anything to do with it.

[@phillipgarrow2297]

@@ernestbrown3690 I have 2016 with a manual transmission it doesn't go into eco mode unless I put it there

[@StefBelgium]

I m changing oil every 5,000 km which is 8,000 miles unless I driving the car hard during that period. I also have the AFM disabler installed already on my C7 Z06 Z07 8 speed automatic. I ll eventually pull the trigger on the AFM delete kit anyway.

[@robertbass974]

I use a Range unit on my Z06 and have had no problems with oil consumption or burning. It has been on the car for almost 2years and nearly 10,000 miles.

[@WarriorsPhoto]

Appreciate your input. Was Lyle's message about the system only working in ECO mode accurate?

[@robertbass974]

@WarriorsPhoto l didn't here him say that. He said the only way the afm didn't operate was paddle mode only, which is correct.

[@cscorvetteify]

@@WarriorsPhoto ECO mode only is for stick shift, paddle-only mode is for automatics. Lyle

[@WarriorsPhoto]

@@cscorvetteify This is what I remembered as well. Thank you Lyle. I’m going to call you all soon about a Vette. (:

[@TheCemonthegreat]

You need to drive your car more

[@johannesvanhoek9080]

I have a range device on my 2019 grand sport already but I thank you for the description and how it actually works 😎👍

[@JamMaul]

Where did you purchase it can you send a link or description to look it up?

[@robskully3539]

⁠@@JamMaulright from Range Technology website

[@bruceolmsted3544]

Thank very much for the informative video. It makes a C6 look pretty good.

[@robarnt6]

Kinda does!!

[@billmcmeekin7909]

Unless you have a Z06! I paid $6500 CAD for OEM Lingenfelter upgraded heads on my LS7. Hopefully my engine is reliable now. I really enjoy my Vette, but it sounds like GM needs to do more R&D or recall weak engine components. Disappointing that you can't trust a new engine! My Boss 302 Roadrunner is bulletproof.

[@dvwash145]

Just came across the video and a new subscriber. Thanks for the additional info. Had a '14 Z51 A6 and didn't worry about this too much. Now have a '17 GS A8 20K miles (purchased Dec. '22) and knew of the potential AFM issues... Bought a Range Finder a few weeks ago but have not plugged in yet as I started having the infamous transmission shudder issue. Driving back from my first big road trip (1500 miles) and experienced the shudder...have an appt in a few weeks for the triple flush recommendation and will definitely plug in my Range thereafter!!! Have read that it should be unplugged before any dealer work so the engine is back to its oem function when they get their hands on it....will be searching to see if you have a A8 transmission shudder issue vid... Missed you at Carlisle!

[@Vexrak]

Did you fix the shudder?

[@dvwash145]

@@Vexrak yes, got the triple flush done…

[@victorjohnson2093]

Thanks Lyle for your messages I’m looking to buy my next Vette looking at going from my C5 to 6 or 7. I think the 6 will be the better choice for me. Thanks Again

[@mikecorlett1305]

Fantastic video! Very informative and helpful. I have a 2017 GS and use the manual paddle shifter 98% of the time while driving the car. Hopefully this will prevent any problems with AFM.

[@ozzstars_cars]

I can't tell you how many internet keyboard experts told me how there such and such C7 doesn't have AFM after I posted the video on AFM and NPP valves. Good info Corvette buddy!

[@shaark92]

thanks Lyle. New sub. I've had my C7Z51 for almost a year. I learned of & put the range device on the OBD2 port as you described before I refueled the second time. Had a Chevy service writer recommend it. As you mentioned, GM put this silly system on all their V8s ... the writer had a shop full of Suburbans, Tahoes and pickups with lifter problems. Shifting back to V8 is where the system runs afoul. I wasn't aware of the high volume oil pump. wonderful. smh. I've been pretty particular about checking oil levels after an AX/Drag/Track event. So far, the LT engine has not burned any extra. This is my daily. have put 20K on it in just under 12 months. fun car. though the wheels are not very strong. Have them getting repaired right now. IDK what to do about that long term. anyhow, I digress. Glad to have one. glad to have guys like you pushing great info, too.

[@cscorvetteify]

Welcome!! Long-Term solution for anybody doing track work in their C7 is upgrading to forged wheels. They are made for that kind of duty, and short of hitting a wall they will not bend or crack. Best $2500 you'll spend if you are involved in competitive driving. Lyle :)

[@StefBelgium]

That's really useful mate! I'll add that it is recommanded that you don't leave the AFM disabler in the ODB port because it drains the battery! I have a C7 Z06/Z07 with the 8 speed automatic and I'm using the AFM disabler since I hit 4,000 km, I now have 5,500 km so far so good. I just need to plug it in and out when I enter/exit the car. It is my week-end car as I have a company car to go to work so removing the AFM disabler from the port is mandatory for me. I will now check to install the AFM kit through my mechanics shop thanks to this video as I don't want to have any issue with my car in the future And this I will need to replace the cam shaft, why not going for an aggressive one then and get a small tune out of it?! Thanks so much for this valuable piece of infotmation! Really appreciate it. Greetings from Belgium. Cheers!

[@cscorvetteify]

My pleasure! Belgium is my favorite place on earth...WWII history and the best beers anywhere in the world....plus, Spa Francorchamps is there....Cheers!! Lyle

[@christianpilon747]

Excellent

[@georgejetzell2678]

I use a plug-in unit called Qzucar. It works fine, no issues.

[@BigFiveJack]

1:16 Lyle states C&S does Not Do "deep engine work". I'll ask if you might do a video on what that really means, and maybe detail for us how far you all at C&S Do Go into the engine work. Thank you for the Great Collection of Videos That You've Posted!

[@TheMrmmkkpro]

My 2015 6.2 Silverado failed at 117k miles, and I used the Range Tech Module. While it keeps your engine from even going into v4 mode, it will not prevent actual mechanical lifter failure. The actual lifter failure is a symptom of reduced oil pressure. I believe my issue was the formed gasket on the cam thrust plate, it was flat, the felpro thrust plate I bought for my cam swap had a much more robust formed gasket than stock. I believe I was loosing oil pressure there which in turn caused lifter failure on cylinders 4 and 7. BTR cam, LS7 lifters and all assorted parts done myself for around 1500 bucks. Purrs like a kitten now. Just drove a 1350 mile trip at an average of around 80 mph and averages 20 mpg. Once deleted your engine will thank you. Nice job on the video, much great info.

[@TheMrmmkkpro]

I forgot to mention, install a oil catch can, is a must. The intake, intake ports in the heads and piston tops were filthy from oil being pulled through the pcv valve. I'm 62 and have been building engines since the mid 70s and this was by far the most filthy engine I have ever torn down. I could eat of the inside of my engine but the pvc system is very bad, my intake valve stems and ports were in very sad shape. An oil catch can will greatly improve this.

[@robertstolting5620]

Lyle, I love all your videos! I did find something out, however, about the AFM disabler you refer to in this edition. I wrote to them and asked them how I actually know that the V4 is not engaging, other than just not getting the indication on the instrument panel. His reply was kinda shocking. Now I was asking about my 2014 Silverado, not my 2003 C5, to which it does not apply. But I have a 6.2L with an A6 transmission, and all the disabler does is put it in M5 mode. So you completely lose the final overdrive gearing, and you are paying $230 for something you can do for free! I am sure it is the same for the C7.....most likely just goes to M7, or the C6! Honestly, to me it is dishonest that they dont tell you this. It doesnt really disable the AFM, just puts you in M5, or M7, which ever is the case. Here is the reply: The device would put the vehicle in M5 mode to prevent the AFM from kicking on. It is most noticeable if you have an aftermarket exhaust, the disabler would prevent the “droning” sound coming from the exhaust when the AFM normally activates. The disablers do reset the emissions readiness modules. We would recommend disconnecting the disabler and driving the vehicle for 50-100 total miles for the readiness system to show a ready status.

[@circusclown9690]

I’ll stick with my C-5 then move on to a C-6 never liked the look of the C-7’s anyways. But good information as always

[@nyplantings2420]

Great video. Not a problem for me anymore I just traded my Z for redeye. Redeye has factory dod delete! Yay!

[@incog99skd11]

You can buy a module to turn it off. My supercharged version had it removed.

[@sammywaltens7308]

Lyle, awesome videos all the time love your Chanel. I just bought a 2015 c7 stingray. it has 17000 miles on it. after I bought this car I see a lot of these videos about the AFM and the transmission cause I have the 8 speed automatic transmission needing a trip flush. it make me wonder if I made a mistake .I love this car but had no idea about this issues. so worried now.

[@cscorvetteify]

Don't worry! Have the triple flush done and get a Range Module to keep the AFM from activating. It isn't a complete solution, but we know both of those things do help, long-term. Lyle

[@wildlesbians]

This is why I will be sticking with my C5. I read articles about the AFM, and it seems the engineers did not design the engine parts to be used this way, such as pistons. I also have heard of incidents where a brittish company supplying the wheel hubs, was providing wheel hubs with out all the ball bearings in the bearings, and the hubs fail. Lots of areas where GM cheaps out on parts and engineering on the c7 and later corvettes. That is a shame, considering the price they charge for the cars. Also a shame, as the c7 and c8 corvettes look really cool. How fun is that, to spend 80 to 120K on a new car, and have the engine failing on you a short time down the road? No thanks!!!

[@incog99skd11]

Mine has a Lingenfelter supercharger on it and the first thing they did was remove all of it from the ground up. I suspect the override module works just fine.

[@wildlesbians]

I can afford one. Just dont have no confidence in the quality. I do agree, they do look great though.@jackmeeoff5257

[@varmastiko2908]

Engines and transmissions failing quickly has become the industry norm. If you want to stay clear, you pretty much have to stay clear of new cars. There's variation in how bad it is for different makes and models but no manufacturer is without any issues. As long as it's legal to do so, it's better to stay with older cars.

[@dirkpalmer1067]

Had 2 C5s and had to get the shift bypass done with manuals to prevent the occasional 2-4 shifts--irritating. First thing I did was get the Range OBD for my 2016 C7.R. Easy fix for both gens.

[@imdeplorable2241]

You're exactly right about GM "cheating out" on parts. When confronted, they'll say, "Would you rather pay $150,000 for your Corvette?" GM, like the government, is a bloated bureaucracy. They both waste A LOT of money.

[@JJ-bb8kq]

So basically, c6 gs is better than a c7 gs. I am looking for vette and it has to be an auto. My left knee is JUNK, so the standard is not an option. By the way I think your videos are kewl!!!

[@fultonguyy]

Just did a 7hrs drive to Biloxi Ms, from Georgia plans were to use Eco mode, after learning about cylinders dropping out to save gas, i kept car in Sport mode i do occasionally get the shudder but keep my foot on the accelerator at those certain speed to eliminate the shudder, i will be buying the Range device, and by the way coming back from Biloxi had to make several more than usual gas stops, one from whooping Azz in Ala, and Ms, i rather pay for gas than a new Engine 😂 2017 Z06

[@243wayne1]

Omg. NOT good. NOT good at all. Damage probably already done from THAT trip. Geez... Better start putting money aside or sell it.

[@paulmoss7940]

I submit that all vehicles have too much tech after 2013. Once again, C6 FTW.

[@timothyhanner8118]

I purchased the range device. It worked, but I couldn’t get my car through emissions this year. The dealership had to reset my computer to get it through. Ended up costing me about $550. Just something to consider if you live in an area that requires the stupid emissions testing.

[@garysnyder1110]

Having an engine stall issue since installing the Range module. It did everything as advertised but do not like engine stall. The stall is rare and occurs when approaching a stop. I was made aware of this issue from a service advisor at my local Chevy dealer. He also experienced the stall issue. Decided to remove the module.

[@cscorvetteify]

Did you contact the manufacturer regarding this issue? The only other option is to have the AFM programmed out by a tuner. Lyle

[@garysnyder1110]

No, did not contact the manufacturer. On the positive side, the module also eliminated my "check engine lite", large vacuum leak. A different Chevy dealer was not able to fix this problem in two tries and $800. My new dealer recommends changing the PCV valve the next time the CEL comes on.@@cscorvetteify

[@joegotz1971]

I traded my low mileage C7 for a 2023 C8. I had AFM problems, mostly after I changed to a Borla Exhaust.

[@SHADOWBLACKs650]

I would like to buy a Corvette, and this video along with others have rained on My Parade, apparently a major problem is also with the lifters collapsing and requiring replacement, even on a 2024 Corvette, such a nice car and engine and they've actually ruined it with this active fuel management.

[@cscorvetteify]

The good news is that there are a ton of Corvette options from 2013 back, so while you may want to avoid the C7/C8 with the government-mandated AFM, a 2012 Grand Sport (for example) is an excellent car and had no such silliness! Lyle :)

[@SHADOWBLACKs650]

@cscorvetteify going to try for a 24' but its a big price for me.... we will see.

[@robherrera6178]

I recently sold my C7 Stingray and went back to a 2012 C6 Grand Sport. I personally am not a fan of the LT1 really expensive to mod when you have to upgrade fuel system. The LS3 is really hard to beat and the I just prefer the wide body C6. Just my 2 cents. Also the C7 Stingray I owned also had this weird slight vibration at 55mph -60 could not figure it out tuning alignment wheel balancing etc. Plus my buddy and his C7zo6 experienced the same thing.

[@jsmith9739]

I have a C7 Z06 Stick with 21k mi and it has the slight vibration that comes and goes in rhythm about every 5-10 seconds. It is not tires. Could it be driveshaft?

[@diegoquijanotorres7019]

@@jsmith9739its probably the torque tube, needs to be replaced or rebuilt.

[@user-fq9ug8zl6n]

I have a 2019 C7 love the car and the info on your channel is great. Can I use the Corvette Red Light Bandit Throttle booster instead of the Range device since they both use the same connection?

[@bobhasslinger2510]

Red Light Bandit connects to accelerator pedal cable. RANGE plugs into the ODB-2 plug. Both can be used together. That is what is on my ‘16 Z06. Bob

[@jeepgunner82]

Drove my c7 cross country on a move, used 4cyl mode on freeways (most of the trip). At destination, the engine blew a lifter. Luckily, GM warrantied the engine, which would've been a $17,000 fix elsewise. If I want to save fuel, I'll use 7th gear

[@joelpierce3940]

I have a 19 stick, but plan to get rid of the system all together. Some interesting information. What if you have a dry sump, with a variable pressure oil pump? Lot’s to undo.

[@z512345]

Boy, I'm glad I just bought a C6 GS. I was considering a C7. I had the 8-6-4 system on my Caddy back in the day,and it sucked!!!

[@rirsz]

Love my 7 spd...

[@Bullwinkle056]

I'd been reading about this in GM truck engines for a few years now. I wondered whether the Corvette had the same issue so I quit using "E" mode in my 2014 Corvette. I guess it just took a little more time to realize that the lower mile Corvettes have the same issue.

[@cscorvetteify]

Exactly. Those trucks hit 150k miles much faster than any Corvette.

[@madriver50]

my lifter came apart at 61,000 miles on a 2017 grandsport, and destroyed the cam and put metal into the engine, $10,500.00 later I had the AFM system pulled out and had all the metal shavings remove

[@sherryswisher8911]

The AFM was more a problem in earlier models mostly in trucks. These later models it is much less an issue and the odds are likely you will never have an issue. These systems really do little for mpg or emissions. GM gets credits from the government for installing and it helps reduce the gas’s guzzler penalty. Most of these latest AFM engines were redesigned and issues are few compared to the early LS engines in the trucks. I you are building an engine for sure remove it. But don’t panic you have to do this or fear of sure failure. The Ranger tool eights well. I work in the performance aftermarket snd we sell the parts to fix these and that is where we see what works snd what fails.

[@Vexrak]

What model year would you recommend for the C7 stingray to have a lower chance of AFM/ transmission shudder/ fluid problem? Not sure if i can afford a 2019 i was looking at 2016/2017 automatic c7s

[@michellariviere6195]

So we should drive with the paddle to skip the afm mode ?

[@anthonypapa8676]

Great vid. also known as D.O.D. Get a tuner turn it off be done with it!!!! If a lifter goes bad you could be talking about a new cam and 4K in labor

[@z06rcr]

Thankfully my C6 ZO6 does not have AFM. However my Cadillac CT6-V does unfortunately… but I use the Range device which works flawlessly.

[@SeanPennII]

I am so jealous of you. Ct6V is a truly elite automobile. I just traded my 14 CTS V-Sport for a 16 stingray. And I miss my Cadillac. Wish I could have kept both

[@z06rcr]

@@SeanPennII it’s really an amazing car combining real luxury with incredible power… always a thrill to drive.

[@robertheinrichs7882]

You said long term a couple of times. In regards, to Not keeping the Range device inferring that; there’s an end use of the Range Device. If that’s correct, what would be a reason to stop using the Range Device other then adding a Supercharger, Cam swap or new tune because what you did requires a new tune to the ECM. Cheers, a fellow Sarasota long time resident😎

[@cscorvetteify]

Hi Bob! To clarify: The Range device does exactly what it is supposed to do with no time limits imposed. The long-term danger is the failure of those special lifters that make the AFM system work. There are thousands of GM pickups with the same system all over the country that have had catastrophic engine failures due to those same lifters...but those vehicles get to 150=200K miles very fast as they have to "work for a living" everyday. That is a preview of what C7 owners can expect if they keep their C7's for that many miles and don't delete the system entirely. Lyle

[@robgoudy1149]

Great Video. I understand the AFM system much better now. I have a 17 GS A8 with the Range device always installed. Question: Do you know of a good shop who has the knowledge to do a proper AFM delete? I have been wanting to upgrade my cam to a stage 2 comp cam anyways, so having the AFM delete done at the same time would be a good idea. I live in Lakeland and we have spoken on the phone before about another issue. Thanks for the great video.

[@cscorvetteify]

Rob, we do not do deep-engine work here. This job would not be in our wheelhouse. I suggest locating a performance/engine- oriented shop for this task. Lyle

[@user-ko2fz5fw9m]

I did some research on how often a ZO6 goes into V4 and according the articles I've read and talking with certified Corvette mechanics they all claim because of the supercharger it will hardly ever go into V4,

[@bobshowup2501]

It also locks out the AMF when your in TRACK mode.

[@jimharrow8104]

Thank God I've got a 2002 C5.... 😮😅...

[@josephaprile2051]

a long time ago, i had a 81 caddy with a 468 engine....i toke to a garage where he disconnected a sensor on the transmission,,,, the car never went into 4 or 6 mode after that... i hope this helps

[@WarriorsPhoto]

Was the car always in high performance mode?

[@blessedlife1039]

They say the range unit is not compatible on the C8’s. The only two ways you can stay out of V4 mode is to shift in manual mode, which isn’t too bad because it automatically down shifts you just have to do all the up shifts. The second way is to select track mode everytime you start it up. Of course ride quality is harsh. I have a 2023 C8.

[@cscorvetteify]

I'll have to look into that...we don't see many C8's yet, as they are all under warranty. I'm sure that Range is working on the issue if there is a possible solution. Lyle

[@bobshowup2501]

So if you Never put it in ECO mode on a manual will it do damage long term by just leaving it alone and running it in V8 mode?? ?

[@stevekru6518]

Please excuse my ignorance, but why must cam shaft be changed?

[@mikerisner]

I have a '17 Grand Sport A8. Hoping for some perspective. Do casual drivers (like me) experience the AFM problems? I only occasionally indulge in spirited driving, and I do not track the car. If I use a Range module, will it affect my Vette's ability to pass emissions tests? I live in a state (GA) with annual emissions testing. Thanks for covering an important topic for us C7 owners!

[@robertbass974]

I have been told by my Corvette tech that it usually happens when accelerating after being in v4 mode.He also believes that going to long on an oil change causes many of the problems but not all.

[@cscorvetteify]

The Range unit shouldn't affect emissions at all, but you can always unplug it for the test and plug it right back in. Frequent oil changes help keep the AFM issues to a minimum, but I recommend using manual shift mode as frequently as possible to leave that system out of the equation when you can. Lyle

[@robskully3539]

@@cscorvetteifyI live in MA and take the module out when going for my yearly inspection. They have to plug something into the port when doing the inspection anyway.

[@TheCemonthegreat]

Yeah, GM has really been cutting corners. My C7 stingray is a stick and stays in sport mode (I'm scared to take it out) so it never goes to V4. Had a 2020 Yukon that had AFM, got rid of it after learning of the AFM problems @ 15k miles for a Lexus GX 460. The Yukon got better gas mileage, as the Lexus drinks gas badly, but it's made better and seems like it will last longer.

[@cscorvetteify]

The manual shift cars only use AFM when placed in ECO mode. Every other mode doesn't engage it. Lyle

[@scottbarker9058]

get a back-bone...shood buy amer. cars..instead of running 2 the asians!!!!nuff-said!!

[@cscorvetteify]

@@scottbarker9058 who said anything about asian cars, my dude??

[@paulsamora1348]

May be a dumb question but is there a speed that the AFM activates?

[@Cando79]

Hello Lyle. No one seem to be able to give a straight answer on the problem of the AFM system. I drive a 2011 Ram 1500 with the system no problem to date. ( December 8, 2023.) Also have C 7 2019 no issues with system. If system causes issues why is GM and others still using system? Is the problems with system is the loss of power to engine?

[@jimclark7917]

Government sucks

[@freshMila]

Thanks for sharing. I’m in the market for c7 what year you recommend for the best

[@cscorvetteify]

2017 thru 2019 are the ones we see the least here at the shop. :) Lyle

[@memphizballa1]

What's the ballpark cost of doing a delete on a C7 Stingray Vette?

[@dougmoore8061]

Would you recommend the deletion kit for a manual transmission if I don't ever turn to eco mode?

[@WaybackRewind]

Totally unnecessary. AFM only activates in ECO mode on the M7

[@anthonyb9911]

Lyle, does the afm have anything to do with the transmission shudder that affects some C 7's I had the shudder in my 2015 and the fix was to do a triple transmission flush

[@cscorvetteify]

Yes, it absolutely does. The shudder is the result of low speed, low rpms and an increase in power demand (like going up an incline) cause the engine to bog and shudder. The answer is to get the Range Module and keep the car out of AFM. Hope this helps! Lyle

[@danlaur7973]

Bring back the mighty LS engines.!

[@houztx]

If I have the AFM tuned out / turned off at the ECM, do I need to change Lifters ? No other major upgrades yet just headers. catless exhaust and a tune. (2014 Z51 Automatic)

[@cscorvetteify]

Long-term, the consensus is that removing the system physically is the best answer. It won't be cheap, but if it is going to be your "forever Vette" it is only permanent assurance that your engine will not fail from the AFM lifters going bad. Lyle

[@WaybackRewind]

Do these issues also apply to the 5.3 truck engine with AFM? I've been driving mine since 2006 with zero complaints.

[@lyleaulwurm9486]

The 5.3 can fall victim to these issues, and online it makes up the vast number of engine failures due to the AFM issues. Of course, they also made far more of the 5.3 than any other AFM V8...so the failure percentage may the same or even less than for the 6.2. Lyle

[@WaybackRewind]

@@lyleaulwurm9486 I guess I've been lucky. I've used my truck for towing and hauling and have had no issues.

[@classiccorvettesmusclecars5846]

I’ve never liked the rear end of the C7 & now C8. This cylinder deactivation & direct injection were just more reason I’ll never own one., Keeping my 2013 Grand Sport forever…

[@Airman..]

The Same exact issue since 2007 LS i don't know why GM let it slide and piss off their loyal customers

[@rodneygreenman8107]

I was wondering why some times my C-7 seemed to loose power.I do not drive on the highway all the time.GM dos some stupdd shet.How do I get one of those plug in range devices? What is the order number and where do I buy it from.Thanks for this GREEAT information.

[@cscorvetteify]

Rodney, just google "C7 corvette range device" and several retailers will pop up. :) Lyle

[@waynegood9233]

I have had my C7 for 9 years and have no problems with this item

[@fredrickmillstead2804]

I disabled the afm as soon as I purchased my C7. Don't want to risk the headaches.

[@rickprice6312]

My G8 GT had this. Camshaft and lifters replaced under warranty at around 25K miles. Yuck. Only issue I ever had with the car.

[@Danasmith2816]

I'm hanging on to me 2003 Z06, till death do us part.

[@cscorvetteify]

That makes two of us. :) Lyle

[@ronalddeering3850]

The problem with the Range device is that it resets the emission monitors. That requires getting them re-established in order to perform annual emissions checks. That usually requires several hundred miles of driving with yge Range device removed. Annoying.

[@davenobleswimmer7235]

I had an engine tuner delete the 4 cylinderl mode once I was out of extended warranty at 72k miles. Now have 88k miles & no issues. Should I consider the total removal of the AFM System

[@cscorvetteify]

According to the authorities that I spoke to, complete deletion of the system is the best way to insure not having issues down the road. That said, IF you don't plan on keeping the car forever you will probably be ok for at least the near future. Lyle

[@davenobleswimmer7235]

But if I remove the entire AFM system will I have to change the Camshaft?, If so that would be the time to get a much better Camshaft and lifters

[@danmoore1744]

Looked into Range for my C7 to find ot is illegal in California. Is the delete kit illegal in California as well?

[@cscorvetteify]

Probably, but contact Lingenfelter to make sure. :) Lyle

[@robertbass974]

Just unplug it when you have a emissions test then plug it back in. It only takes 2 seconds!

[@petercosentino6653]

Do you know if this AFM system is on the LT4 crate motors

[@cscorvetteify]

I would assume so, but check with GM directly to be sure. Lyle

[@RichardK-ql7mt5qi2y]

I have a 14 z51 Stingray. It is the 7 speed. So I understand that it only goes to 4 cylinders in Eco mode. Does it cause any problems if I am cruising in the interstate and put it in Eco or should I just never put it in Eco mode?

[@MrAmmotube]

I have a 2018 7 speed Stingray and I NEVER use ECO mode because of AFM. When I first got the car I used it some but I did not like the shudder felt when the system turns on and off. During C7 development the cars shook so badly that the torque tube had to be reengineered and made stiffer (and heavier) in order to reduce the shudder. In my opinion, the car is fuel efficient enough without AFM. I recently took it on a highway trip. After 576 miles with an average speed of 70 MPH it got 30.3 MPG. Hot weather so AC was on all the way and had a heavy load of luggage, passenger and a dog in her lap. I took a picture of the Speedo documenting all this. I was doing 86 MPH and it was turning a little less than 1600 RPM. Ran in touring mode for the trip but I normally run sport mode.

[@RichardK-ql7mt5qi2y]

@@MrAmmotube thank you sir! I haven’t noticed the shuddering but I will plan not to use that mode further