Range uses factory messages sent over the CAN Bus to "tell" the ECU to stay in V8 mode. This is a best-selling AFM disabler that can eliminate cylinder drop and speed bottleneck for any GM 5.3L Active Fuel Management engine. Best Overall: Range Technology Active Fuel Management Disable Device Criteria for Comparison As soon as we turned the key, it kicked into action, bypassing the AFM in a record response time. Turn off half chambers and reduce the fluid flow. All of these require the use of a Range AFM Disabler. Does using Range products void my factory warranty? I've made a few observations pre and post Range AFM disable. Notwithstanding, there could be other issues that can cause an engine to be unresponsive. If it is not, contact the manufacturer to carry out the necessary update. Best AFM Disabler - [Top 6] Reviews & Buying Guide 2021 - Mechanic Insider The Range Technology AFM Disabler is designed to disable the AFM system so that your engine can run at full power all the time. Warranty and Policies - Range Technology Theyre a cheap fix for people who want to disable AFM as soon as possible. The next time I took my car out it didn't want to start and then finally it started and I drove off, as soon as I got on the road it tried to die on me again. But if everything else seemed good, remove the AFM disabler; the CEL could just turn off. I got it started and drove it home and didn't have any other problems that day. Installation is as simple as plugging it into the OBD-II port. The Range AFM Disabler is a plug n play device that lets you get the most out of your GM vehicles engine. The main difference between afm delete tuners and disablers is that disablers deactivate the Active Fuel Management for as long as they are plugged in. I just couln't afford to take any chances at having to go through an engine disassembly so soon in my truck's life. There are times when the Active Fuel Management (AFM) disabler on your vehicle can cause problems. Make sure to oil them and look out for any signs of deterioration. Plus, there are certain cases where they violate the vehicles warranty. It helped me maintain a set cruise speed going down some hills with a light 2000 pound trailer load, and the fact that the engine no longer shuts off at stops or red lights (the "e" model has the Lithium battery pack and induction motor to spool up the engine under these conditions but it won't do any of that while this particular unit is plugged in). Fitting a silencer will help with the noise when youre driving with the AFM disabled. There was a slight shutter on light to moderate acceleration. You get to enjoy good throttle response and enhanced fuel efficiency. Many of our customers ask, Will your product void my vehicles manufacturers warranty? Range is committed to providing quality products that are safe to use.

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