Dodge Repair Questions? Ask a Mechanic for Answers ASAP
The system cleared out your last question. What year is your Durango again?
That's awesome, my son just started. This was his third den meeting. Last week was the Pinewood derby- he placed second. Everyone blamed his mechanic Dad...go figure.
It sounds like they are on the right track. Bad lifters (MDS solenoids) are fairly common on this engine and dodge blames it on engine sludge. That usually means that the part was poorly engineered and will need replacement regardless of how much or how little sludge there is.
The lifters have to fill with oil pressure to open the valves correctly. If the oil passages become restricted the valve doesn't get opened at the right time or duration and the engine misfires. If the oil can't get through for long enough time then the lifter gets scored and might damage the cam shaft. I doubt that happened unless you were getting an engine chatter.
They will (or at least should) probably replace all of the lifters and put it back together. It will likely cure the problem. I can't imagine there would be any additional engine concerns if they performed the leak down and compression tests properly. Any cylinder or head problems would have shown up in those tests.
The only bad news I would prep for would be if the lifters were bad enough score the cams. Then you will need all new lifters and new cams. That might get expensive.
So the PCM wasn't commanding the MDS solenoids rather than a problem with the solenoids themselves. That's odd that they couldn't see that through the data stream from the PCM. I'm glad they got you going again!
Please let me know if you need help in the future.
Just Answer must be sending you automated messages.
The system has this question logged as "not yet rated" on my end. Perhaps try again? Maybe it's hung up somehow. I'm sorry, I've never seen how it looks from the customer side. As experts we get a limited view of what goes on on the customer end.