Well, I did what I said I was not going to do. I replaced the MDS harness with a brand new OEM harness and it fixed nothing. The 17 year old harness I replaced looked very good. Back to square one.
Uploading my answer to that post here.i have 2 Durango's same year 2006 with this problem, one has a problem with cyl4, it runs fine until MDS kicks in. then when its time to kick out of MDS cyl4 wont reactivate unless I shut the truck off and reset computer. unplugging oil sensor keeps it from turning on MDS. i replaced the MDS cyl4 in this truck with no fix.
2nd Durango has a problem with 4 and 7 going by the trouble codes, both cylinders started acting up at the exact same time. with that truck it runs on 6 cylinders from startup. I have to unplug main MDS plug on driver side back of engine.. then it runs fine. as soon as i plug it back in it runs ruff. This one i think it could be the wire. but today i ran the same alfaobd test in my last video and 4 and 7 don't make the ticking sound. i have not changed any MDS on this truck yet.
on both trucks all MDS solenoids in the test make a clunk sound to start and then a buzzing sound for 10 sec then a clunk off sound.
the working MDS solenoids make a taping sound when its buzzing in the 10 sec window, like in my video.
Both trucks run awesome other then this, Even now with MDS disabled/bypassed.
I just read a old 2019 post that AlfaObd can turn off MDS im trying to confirm in another post.
I started thinking the same thing about the pin. but when i tested the MDS with truck off and no oil pressure it was stuck on when i started after the test, I would think without oil pressure the pin would not activate.
Yes and yes.So I assume you are using the correct oil viscosity otherwise you would get a DTC suggesting so? Also have you followed the diagnostic steps outlined in the FSM for P1414?