cuda341
Junior Member
I have a weird thing happening at 135K miles, with a clean well-maintained, original-owner 2009 Ram 1500 Hemi MDS. It’s actually two things that are probably related:
- After a cold start, it runs fine. I drive about 1 minute and if/when it kicks into eco/MDS mode, it runs poorly (95% sure due to cyl #5 - see below) until I either pull over and turn off the ignition completely, and restart, or until it warms up over ~165F or higher. This NEVER happens if I start out in Tow/Haul mode or with shifter in a lower gear i.e. 5th, in order to keep it from going into eco/MDS mode until warmed up (or over 165F). Once it’s warmed up, I can use eco/MDS mode just fine, and it purrs along great – like new,
- BUT under normal operating temp, if I put relatively heavy throttle into it, typically on the highway, somewhere between 3-4K RPM, it throws a P0305 #5 cyl misfire code. When I let up, the light usually goes away pretty quickly. But this will repeat fairly consistently under heavier throttle, and when it’s occurring, I can usually feel the roughness until it clears.