How do I know if my AFM Lifter is bad? With the Lifters the noise it creates in your Trucks’ Engine is clear. More of a tapping noise, if Lifters are bad, get over to an Automotive Repair Shop. The longer you go with bad Lifters the more damage happens with your Vehicle. However, there was no for-warning with this Engine, and it did damage not only to the Lifters but with the AFM and to the Engine itself. It is possible to catch this problem early, making sure the proper level of Oil for lubricating the Lifters is present. Without Oil the Lifters will suffer in function.