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Mack E Tech


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So here is the deal. I'm helping a friend with an older mack with the E Tech in it. He just did a motor swap and had the ECM reflashed for the reman motor. The problem is it is still running poorly and throwing a code saying mid:128 sid: 231 fmi: 8 blink code 6-8. We did a cylinder cutout test and got no change in how the motor runs with cylinder number 5 cut out. That tells me number 5 is dead. We checked the eup, injector, cam, lifter, timing, ran the rack on it twice, and pressure tested the cylinder. I know the code is for the data link on the J-1939 but would that have anything to do with number 5 being dead? Any insight or help would be awesome. 

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