Engine switch please help
Captain
Joined: Mar 2012
Posts: 597
Likes: 33
Yes. Just went thru this. MDS equipped hemis have different cam and lifters. I rebuilt with non mds cam and lifters. MDS solenoids are under intake and were difficult to remove due to rust. Although We werent being to careful we broke all 4 taking them out of the block. They are plastic. Replaced the solenoids with similar plastic plugs.
Purchased a HP tuner and software. Went into the settings in the PCM and disabled MDS. Not many miles on it yet but so far so good
Purchased a HP tuner and software. Went into the settings in the PCM and disabled MDS. Not many miles on it yet but so far so good
Legend
Joined: Nov 2014
Posts: 8,098
Likes: 318
I think they are relatively easy to get to, but, in an application that DOESN'T use MDS, there won't be connectors for them in any event. It is my understanding that the pcm energizes the solenoids to disable those cylinders, so, simply not having them hooked up *should* work just fine.
Now, if the truck the engine is going into actually HAS MDS, and expects things to change when it tries to engage it, (it will still cut fuel to those cylinders) THAT will be a problem. The engine block should be the same though, but, I think cam, and lifters are different as well, so, it isn't just a matter of adding the solenoids. Easier approach might be to disable MDS in the programming.
Now, if the truck the engine is going into actually HAS MDS, and expects things to change when it tries to engage it, (it will still cut fuel to those cylinders) THAT will be a problem. The engine block should be the same though, but, I think cam, and lifters are different as well, so, it isn't just a matter of adding the solenoids. Easier approach might be to disable MDS in the programming.
Captain
Joined: Mar 2012
Posts: 597
Likes: 33
if he ( does as you suggested ) and plans on putting the mds solenoids into the 2500 engine that does not have mds cam and lifters he is in for issues
Legend
Joined: Nov 2014
Posts: 8,098
Likes: 318
Well then I must have a miracle engine. 2500 everything with MDS selenoids.
Veteran
Joined: Feb 2018
Posts: 408
Likes: 6
I think they are relatively easy to get to, but, in an application that DOESN'T use MDS, there won't be connectors for them in any event. It is my understanding that the pcm energizes the solenoids to disable those cylinders, so, simply not having them hooked up *should* work just fine.
Now, if the truck the engine is going into actually HAS MDS, and expects things to change when it tries to engage it, (it will still cut fuel to those cylinders) THAT will be a problem. The engine block should be the same though, but, I think cam, and lifters are different as well, so, it isn't just a matter of adding the solenoids. Easier approach might be to disable MDS in the programming.
Now, if the truck the engine is going into actually HAS MDS, and expects things to change when it tries to engage it, (it will still cut fuel to those cylinders) THAT will be a problem. The engine block should be the same though, but, I think cam, and lifters are different as well, so, it isn't just a matter of adding the solenoids. Easier approach might be to disable MDS in the programming.