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Availability:
Only 10 left in stock, order soon!
Arrives
Tuesday, Nov 4
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Features
- Keep your vehicle in V8 mode! Disable 4-cylinder mode on all GM active fuel management vehicles. Full Power all the time.
- Plugs into diagnostic port with no tools needed. Simply plug into your onboard OBD-II port and it instantly begins working to eliminate the AFM system.
- Does not reprogram factory ECU. Leaves no trace. Unplug it to return to factory settings.
- Please disconnect your battery before installing.
- Power to the people. Increased throttle response and more consistent power delivery across the entire power band.
Description
★ Keep your vehicle in V8 mode! Disable 4 cylinder mode on all GM Active Fuel Management Vehicles. ★ Installs in seconds! Plugs into diagnostic port with no tools needed.Does not reprogram factory ECU. Leaves no trace. ★ Full power all the time. Increased throttle response and more consistent power delivery across the entire power band. ★ Best for high load scenarios, such as towing, off-road, icy or snowy conditions or high speed commuting. IMPORTANT: DO NOT LEAVE YOUR QZUCAR DEVICE INSTALLED ON A VEHICLE THAT IS NOT DRIVEN DAILY. UNPLUG DEVICE IF THE VEHICLE WILL NOT BE DRIVEN FOR A FEW DAYS . THERE MAY BE A DRAW ON THE BATTERY IN SOME VEHICLES. ［NOTE］: The Qzucar AFM Disabler is currently NOT compatible with 2019+ Silverado and Sierra models equipped with 5.3L / 6.2L motors and 10-speed transmissions.
Brand: Qzucar
Power Source: Battery Powered
UPC:
Manufacturer: Qzucar
Manufacturer: Qzucar
Brand: Qzucar
Item Weight: 2.08 ounces
Product Dimensions: 3.05 x 3.07 x 1.73 inches
Manufacturer Part Number: Qzucar-4V8
Date First Available: December 23, 2020
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Nov 4
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Gives me peace of mind that my engine won't grenade one day from bad lifters. Just make sure to unplug it if your vehicle is going to sit more than a few days, will drain the battery
Reviewed in the United States on April 18, 2025 by Harrison Guilliams
I own a 2007 Chevy Avalanche with the Active Fuel Management system. Every time I would slow down I would get this shudder or vibration throughout my whole vehicle. I had no clue of what could be causing this but did some research. I lubed my calipers, checked and lubed my drive shaft. I changed my spark plug wires, throttle body and was to the point of changing the wheel hubs and the torque converter. After reading some online threads I found the information about disabling the AFM by using an OBD II plug in. I figured what could it hurt. So I ordered this little device, disconnect my negative on my battery, installed the disabler, reconnected the battery and an immediate difference was noticed. V8 mode is now constant and no more vibration/shudder when slowing down. This saved a lot of money I would have spent trying to figure out this issue. Because of V8 mode your vehicle will burn more fuel but at the same time lengthen the life of your engine. I haven't noticed a significant battery drain but it's possible it your vehicle is not driven for long periods of time. This device doesn't delete AFM, it just disables it.
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Reviewed in the United States on July 18, 2023 by Bernard
Caused my truck to go in limp mode
Reviewed in the United States on September 10, 2025 by Timothy Hicks
It's easy to install, it works on my silverado even though I didn't disconnect the battery. It hasn't gone to 4 cylinders one time since I've installed it and it doesn't drain my battery. It turns off when I turn my key off. The truck feels like it has its pep back, but I also installed this after I had the rockers and lifters replaced for a second time. Hopefully, this product keeps me from having to do that a third time. I can't give it a proper mileage rating in this review because I haven't been tracking, but I will and I'll update when I do. Then again, it's a truck. UPDATE: I literally just had my engine rebuilt and blew the engine while this product was being used. You've been warned.
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Reviewed in the United States on July 27, 2021 by Jerome L
Having read all the horror stories about collapsed lifters and premature engine rebuilds caused by the Chevy AFM system, I opted to get a bypass widget. Installed it after disconnecting the negative battery cable then fired up the engine (2018 Chevy Silverado 1500 w/ 5.3l with 24k miles). Device worked as advertised and I never had a V4 drop off on a 450 mile round trip pulling a small enclosed cargo trailer carrying about a ton of weight. Mileage dropped from 22 mpg to 13 mpg on highway but it was all because of the poor aerodynamics of the brick shaped trailer. Also had several bizarre prompts on dash--Roll Driver Window All The Way Down Then All The Way Back Up, Open Then Close Driver Side Door...odd. Did enjoy the quicker response when pulling away from stop signs and red lights and ridding the truck of the unnerving floating feeling when going from 8cyl to 4cyl. More precise shifting from the tranny too.
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Reviewed in the United States on July 5, 2021 by Mike Wrbelis
Waited for 2 oil change cycles on my 2013 Sierra 5.3 before reviewing. I change my own oil and filter. I was getting "low oil pressure" because of Low Oil Level with anywhere between 20 to 35% left on the oil life monitor. I would have to add 1-3 quarts to get level back up, and make it until oil change. Also would notice only 2 to 3 quarts left in oil pan upon draining (not counting filter). Reading fourms online my symptoms led to my diagnosis that I had an "over active" Active Fuel Managment lifter creating too much oil spray then burning through the PVC system. Since this device disables the AFM system, as well as reading others online, I decided to try this device. After 2 oil change cycles, I have not received the "Low Oil Pressure" message, AND noticed almost a full 5 quarts drain from oil pan (not counting filter) so almost the full 6 qts added. I am also hopeful this will lessen the chances of having damaged lifters/cam, which is a a common issue with these engines. I also DID NOT notice any difference in fuel economy. I also researched and this device DOES allow overdrive/converter lock up (which is a hack by leaving truck in M5 gear range) I purchased this for my particular issue, which MAY NOT be your issue. Many variables can create excessive oil usage/burning. I had 25 years of GM dealership experience before retiring 8 years ago into the high voltage electrical field. I also use ONLY Dexos approved oil as well as Delco filters. I also change oil with between 10-0% on oil life monitor system depending on when I can get it done. Thats my review. I will update if I notice any huge issues, but for me, for now this device far exceeded my personal expectations.
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Reviewed in the United States on July 1, 2023 by Paul F.
After a couple weeks it stopped working?? I will NEVER have a vehicle without this device hooked up to it. If I wanted V4 I would buy a V4!!! I purchase my trucks and SUVs with V8s so I can have a V8. I can only speak for GM engines, but this thing works as advertised. Still getting 18+ MPG with V8 running all the time, and no more of that V4 under power. SImple to hook up, disconnected Negative Battery Cable, Installed as directed, re-connected battery. My truck went through a self diagnostic, and shortly after the computer recognized all the electronics I had no more V4.
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Reviewed in the United States on January 26, 2022 by Brian B
Purchased this to get rid of afm. Guess what it works!!! Key out with the vehicle off is how I installed the product. 2018 GMC Sierra Crew Cab 4x4 5.3L motor. It has been a month since I installed it and it has been doing its job. I have not noticed any negative since install. My mpg has actually improved over using afm. Having full v8 mode has been great with constant full v8 power and no more sluggish acceleration etc. I have done several long trips since installation and averaged 24mpg with a max of 28mpg on the highway. In the city I am averaging anywhere from 17 to 20mpg in the city. Overall cheaper than the other brands and works perfectly! I highly recommend it.
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Reviewed in the United States on April 24, 2022 by Roberto