[heidihancock93]

I have a 2005 Chrysler 300C with a 5.7 l Hemi in it I just replaced the engine wiring harness and now I've discovered that while I'm driving at a steady speed it will bog down like it's going into a lower gear is this normal someone told me that my car goes from 8 cylinders down to 4 cylinders?

 

[CtCarl]

Chrysler Engineer Burke Brown on the Hemi and Multiple...

Chrysler Engineer Burke Brown on the Hemi and Multiple Displacement V8s interviewed by Marc Rozman and David Zatz We had planned on MDS [multiple displacement system or cylinder shutoff] as a company, it had been there from the beginning of the Hemi. But as we were putting together all our...

www.allpar.com

 

[Curious Joe]

I have a 2005 Chrysler 300C with a 5.7 l Hemi in it I just replaced the engine wiring harness and now I've discovered that while I'm driving at a steady speed it will bog down like it's going into a lower gear is this normal someone told me that my car goes from 8 cylinders down to 4 cylinders?

Welcome to the forum. My car is a 2020 300S 5.7 and I experience no ‘bogging’. The MDS transition is smooth and I only know due to the instrument panel indicator. Perhaps something else is going on here. A quirk on the early models?

Regarding the tendered article, I drove a couple of the 1981 Cadillac DeVilles with the panned V8-6-4 ‘one year only’ motor and found the transition to be smooth also.

A co-worker bought a new ‘81 Coupe DeVille with the motor-he also had no complaints other than he preferred the motor to run on 8 cylinders all of the time ‘like they were supposed to’. Disconnect a wire somewhere and the V8-6-4 would stay in 8 cylinder mode.

Going back to my car, I enjoy a considerable fuel savings with the MDS operation - 30 mpg is common on highway trips.

 

[Marhynalds300c]

I have a 2005 Chrysler 300C with a 5.7 l Hemi in it I just replaced the engine wiring harness and now I've discovered that while I'm driving at a steady speed it will bog down like it's going into a lower gear is this normal someone told me that my car goes from 8 cylinders down to 4 cylinders?

 

[Marhynalds300c]

The short answer yes if in overdrive the car will shut down 4 cyl for fuel economy. There have been some issues with valve seats dropping out on those cyl that at shutbdown if you dont let the car idle for a few minutes in park before shuting it off. Or I suggest taking the car out of overdrive a few minutes before a stop and shut off. I have a 2006 300c and have not had aby problems with the MDS but several have.