MSDS dropping cylinders

[wild E coyote]

I always thought this was a bad thing
for a motor but have seen where you
get to 8th in High and push minus on the steering and it detaches the MSDS
to not drop cylinders to eco mode
and the Trans. shifts normal., once the
truck is restarted the ECU goes back to
controlling the Trans.

 

[fishslayer]

My 21 has always done that... and i use it. i dont like the eco mode..i think its the root cause of all the lifter issues in Hemis

 

[bigdodge]

I always thought this was a bad thing
for a motor but have seen where you
get to 8th in High and push minus on the steering and it detaches the MSDS
to not drop cylinders to eco mode
and the Trans. shifts normal., once the
truck is restarted the ECU goes back to
controlling the Trans.

and your question is?

 

[Scap]

MSDS is Material Safety Data Sheet.

 

[mikeru82]

I always thought this was a bad thing
for a motor but have seen where you
get to 8th in High and push minus on the steering and it detaches the MSDS
to not drop cylinders to eco mode
and the Trans. shifts normal., once the
truck is restarted the ECU goes back to
controlling the Trans.

Appreciate the information but this is common knowledge. It's actually called MDS though.

 

[G Gerard]

I always thought this was a bad thing
for a motor but have seen where you
get to 8th in High and push minus on the steering and it detaches the MSDS
to not drop cylinders to eco mode
and the Trans. shifts normal., once the
truck is restarted the ECU goes back to
controlling the Trans.

I installed a Pulsar XT module and permanently shut off start stop and MDS. It gives you control of several other functions too. The MPG loss is negligible and I believe it will keep the engine from problems down the road. .

 

[RAMTEXAS]

i think its the root cause of all the lifter issues in Hemis

from what i have read recently, it's due to poor lubrication of the lifter and its surrounding components...

 

[fishslayer]

from what i have read recently, it's due to poor lubrication of the lifter and its surrounding components...

So, like when you shut off those lifters oil pressure?

 

[HSKR R/T]

So, like when you shut off those lifters oil pressure?

The oil pressure actually increases

 

[HSKR R/T]

MSDS is Material Safety Data Sheet.

Which are now just SDS.

 

[G Gerard]

So, like when you shut off those lifters oil pressure?

I have been told that it literally shuts off oil to the lifters, which makes no sense. I am not sure if that true, but it would explain the rise in oil pressure.
MDS is just a bad idea. There is no way that is good for the engine. I shut that off permanently along with start / stop and lost a whopping two miles per gallon at most.

 

[mikeru82]

I have been told that it literally shuts off oil to the lifters, which makes no sense. I am not sure if that true, but it would explain the rise in oil pressure.
MDS is just a bad idea. There is no way that is good for the engine. I shut that off permanently along with start / stop and lost a whopping two miles per gallon at most.

No, you have it backwards. The lifters see higher pressure oil when MDS is active. Under non-MDS operation the lifters still get oil flow. Just not under high pressure. MDS does not cause lifter failure. In fact, there are those who say that disabling MDS causes more wear because of the lack of high pressure oil to the lifters. There is a ton of conflicting information out there, mostly by uninformed people who are passing on what they read in a forum. I would suggest that you do your own research if you really want to understand the system. Here is just one article of many that are out there.

What Is Hemi MDS?

We explain how Chrysler Hemi MDS cylinder deactivation works, what goes wrong, and how to fix it when it breaks.

www.hotrod.com

 

[Scap]

Which are now just SDS.

Not to be confused with roto hammer drill bits or tapered bushings....lol

 

[G Gerard]

No, you have it backwards. The lifters see higher pressure oil when MDS is active. Under non-MDS operation the lifters still get oil flow. Just not under high pressure. MDS does not cause lifter failure. In fact, there are those who say that disabling MDS causes more wear because of the lack of high pressure oil to the lifters. There is a ton of conflicting information out there, mostly by uninformed people who are passing on what they read in a forum. I would suggest that you do your own research if you really want to understand the system. Here is just one article of many that are out there.

What Is Hemi MDS?

We explain how Chrysler Hemi MDS cylinder deactivation works, what goes wrong, and how to fix it when it breaks.

www.hotrod.com

Thanks for that info. I appreciate it.

 

[Greaser]

It would be interesting to know if those experiencing engine issues, generally speaking, fall into the low mileage/long idle times categories?

Dodge Ram trucks are really popular in this neck of the woods and the number of post-2000 beaters that are used as daily workhorses never ceases to amaze me for a truck that seems to attract a lot of negative online chatter when it comes to mechanicals. Surely if they were that bad there would be fewer of them on the roads? (Older Fix Or Repair Daily's are like rocking horse poo round here - sure there are still the odd 90's F150 and 250's knocking around but 11th and 12th gen F150's are rarer than hens teeth round here...)
Could it be that a Dodge Ram designed to haul stuff around does not do so well when it's used as a pavement princess that does little more than sit on a driveway most of the week with the odd trip or two to the mall a couple of times a week?