The easiest way to tell if your Hemi engine has MDS is to look for the “MDS” logo on the valve covers. If it’s present, then your engine has MDS. You can also check the owner’s manual or ask a dealer representative.
If you have a Hemi engine, chances are you’re wondering if it has MDS. Here’s how to tell:
MDS is a feature of some Hemi engines that allows them to run on four cylinders when under light load, which conserves fuel.
When the engine is under heavier load or higher speeds, all eight cylinders are engaged. You can usually tell if your Hemi has MDS because there will be a slight ‘loping’ sound at idle, similar to a V8 with cylinder deactivation.
If you’re not sure whether or not your Hemi has MDS, the best way to find out is to consult your owner’s manual.
It should list all of the features and specifications of your particular engine. If you still can’t find out for sure, take it to a qualified mechanic and they should be able to tell you for certain.
How Do I Know If My Challenger Has Mds
If you’re wondering how to tell if your Dodge Challenger has MDS, there are a few things you can look for. First, check the vehicle’s options sticker to see if it has the MDS option code (MNU). If it does, that’s a good indication that your Challenger is equipped with MDS.
You can also look for an MDS “on” light on the instrument cluster. This light will come on when the system is active. Finally, listen for a slight humming noise coming from the engine when MDS is engaged.
This noise is caused by the deactivation of four cylinders.
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Which Hemi Engines Have Mds?
MDS, or Multi-Displacement System, is a technology found in some Hemi engines that allows the engine to run on only four cylinders when full power is not needed. This can improve fuel economy by up to 20% compared to a similar engine without MDS. MDS is activated automatically based on driving conditions and cannot be turned off.
The following Hemi engines have MDS: 5.7L Hemi V8 (found in the Chrysler 300, Dodge Challenger, Charger and Durango), 6.4L Hemi V8 (found in the Dodge Challenger, Charger and Durango) and 6.2L Supercharged Hemi V8 (found in the Dodge Challenger SRT Hellcat).
What Year Did 5.7 Hemi Have Mds?
The MDS system was first introduced in the 5.7L Hemi engine in 2003. This system allows the engine to operate on four cylinders during light loads to improve fuel economy. The MDS system is active at speeds below 50 mph and during coasting or deceleration.
When the system is active, cylinder 1 and cylinder 4 are deactivated. Fuel is cut to these cylinders and they do not fire. The intake and exhaust valves for these cylinders remain closed and the spark plugs are disabled.
What Year Hemis Had Mds?
The MDS system was introduced in the Hemi engines in 2003. It was first used in the 5.7L Hemi V8 engine and then later in the 6.1L Hemi V8 engine. The MDS system allows the engine to run on four cylinders when full power is not needed, such as during highway cruising, which saves fuel.
What Year Did Ram Get Mds?
Ram was introduced to MDS in 2019.
What is MDS? Multiple Displacement System: How to Disable MDS Temporarily
Conclusion
If you have a Hemi engine in your Chrysler vehicle, you may be wondering if it has MDS. MDS stands for Multi-Displacement System, and it’s a fuel-saving feature that allows the engine to run on four cylinders when full power isn’t needed. To see if your Hemi has MDS, just look for the “MDS” light on the dash.
If it’s lit up, then your Hemi does indeed have MDS.
