At first glance, this replacement Dorman MDS lifter transducer looks like an injector, as many of its parts act similar to an injector's. These often get clogged with particles from the oil. When that happens, the lifters can fail if the solenoid is not replaced.
A common scenario with the MDS system in Hemis is where the ECM believes the lifter is engaged at higher rpm when it is not. Here, the internal pin that locks the lifter body to the plunger is still disengaged when the engine rpm goes up. In this failure mode, the roller follows the cam lobe, until it reaches an engine speed where it can't, and the roller crashes repeatedly on the lobe. Eventually, the lifter, roller, needle bearings, and the lobe surface become damaged to the point of failure.
^ right from MotorTrend. Lifter failures are enough to take out any motor.
Last edited by A39Coronet; 07/13/21 06:39 AM.
