Thanks for the update.
Get a no limits device, shut that MDS motor killer off, and never look back!!! also allows you great security features jeep hasn’t provided us with!
Got one, MDS is off. Has been that way since about 150 miles on the ODO.
I would bet that the MDS is activating and it is switching to four-cylinder mode, which has a horrible drone. Take a look at your dash when you are at these just barely on the throttle conditions and I bet it says four-cylinder.
There have been suggestions that Jeep might have made a change in the fuel cut maps that has caused this deceleration drone between 2,000 and 1,500 rpm. I think this assumption is the answer if not very closely related to the question. If you apply very slight throttle during this deceleration you can all but eliminate the drone. This leads me to believe the drone is a result of engine compression braking and this rpm range results in resonant frequencies in the exhaust being amplified.
Yes. I have pretty much concluded that for fuel efficiency, deceleration fuel cut off (DFCO) is mostly likely the problem, the parameters of which have changed and need to adjusted. I think only a tune would solve this, which would invalidate the factory warranty, if we do it.
Not that I disagree with your issue, but it’s probably worth accepting that the Jeep CEO is never going to respond. It’s not that he’s personally ignoring you—your emails are almost certainly being filtered out long before they could ever reach him. The idea of a CEO hearing directly from individual customers sounds great in theory, but in reality it rarely happens, especially at large companies.
As it was on mine but greatly reduced! The best way to deal with these issues are at the dealer level contrary to popular belief. There are some incredible dealers out there, ones that acknowledge the issues that unfortunately the manufacturers just can’t fix yet we all know there are ways of actually fixing it, but everybody’s worried about warranty warranty warranty in my situation between the dreaded drone making me nauseous the MDS lifters rattling like a box of marbles and a constant smell of coolant amongst some other issues that I can’t quite remember right now my dealer got tired of doing the same old repairs to wind up dealing with the same old issues, in the end by using Mopar parts only we switched to a non-MDS cam non-MDS Lifters a higher volume fuel pump. My dealer refused to touch the PCM, which wasn’t needed at that point anyway and my truck drives absolutely perfect now I do sometimes think when almost at a dead stop about 15 to 1600 RPM I think I do hear a slight hint of drone when coming to a dead stop, but God it is 1 million times better than it was before. Also my fuel economy is 18.4 highway at 70 and my average is 15 around town my engine is quiet runs cool and the truck for some reason has a lot more power than it did before.
Don’t touch the pcm that seems to be where most reps draw the line! The no limits device basically does the same thing as shutting off the MDS in the PCM would it also allows you to do is keep people from mimicking your key IDs, and stealing your vehicle by using a crazy way of keeping all four tires locked, minimizing, the amount of torque and power when a valet takes your jeep! my text said most reps do not mind`tuners or the no limit tuners as they do understand there are things you just need to do like for instance if you drive on the beach constantly dealing with having to fill your ties back up to 37 psi before you can bring them down to wherever you need to drive your jeep while on the street! it’s honestly my opinion that what Jeep intended to build with our new 392 platform comes close to truly being one of the finest vehicles I have ever driven and I’ve had everything , granted they were neutered due to café standards, which caused all these MDS issues they did unfortunately use cheaper suspension components as far as the shocks go in the 2024 and up, but these are minimal things and things that I have corrected on mine! I wish you all the luck in the world perhaps you could find a dealer that completely understands as my dealer understood after his repeated attempts of trying to fix these issues with dozens of these 392s that he has been beaten up with over the last few years.
So the non-MDS cam, non-MDS Lifters a higher volume fuel pump where all replaced under warranty?
Yes I had 3 bad lifters and marks on the cam and a leaking head gasket! And of course the dreaded exhaust manifold leak which was on the p/s but we think that side manifold is slightly warped! Also at hot idle I was below 20 psi I believe and there seemed to be concern weather that was enough! My 392 at 6000 miles had at least 4 oil changes and I only use that ultra pennzoil oil! Again pcm not touched and only mopar parts used
Interesting.
Not that I know of!
@Srtmodmaster definitely caught a lucky break—right place, right time. It sounds like the dealer was probably reimbursed by CDRJ for the work, but the parts they used wouldn’t have passed a strict warranty audit. Ironically, the fix he got was likely cheaper than doing everything “by the book,” and clearly a lot more satisfying (who wouldn’t love that outcome?). Still, it’s probably not something the rest of us should expect to see replicated.
Its just the Clayton Performance coils with 1" Teraflex in the front and .5" in the rear.
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