Join Date: Nov 2011
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I've experienced the bogging problem off and on since I took delievery of my '09 R/T. Had it at the dealership to fix the problem four times. First time, they had no idea what it was or how to fix it. They cleared the fault codes, downloaded updates to the computer, and problem immediately returned. They had to get on the phone with the corporate techs/engineers to come up with a fix. Was told my Challenger was only the second one in the country to have experienced this problem. It would drop in and out of MDS in any form of accelleration. Turned out to be the cam or crankshaft position sensor. Happened again about a year after that. They replaced the cam position sensor that time, but was told it was somehow related to an oil sensor.
Since I've been dealing with this for some time, I've come up with some theories and observations. I'm not 100% positive but two things seem to have triggered the problem. The first is it seems to happen right after getting an oil change. I've always taken it to the dealership where I bought it, for the oil changes, so Chrysler techs doing the work. (free oil changes 1st year, major discount after that at dealership) The other thing that seemed to trigger the problem was when I changed grade of gas. Being an R/T auto, it isn't supposed to require premium unleaded like the R/T manuals or SRT's. When money was tight I ran it on regular unleaded which according to Dodge is what it was designed to run on. When money wasn't a problem, and I was looking for a little extra performance (based on butt dyno), I'd fill up with the middle octane gas, which is usually the norm. The bogging (MDS) problem seemed to follow a change in octane of the gas I was using. This last time I took it to the dealership, but had to wait a few days for the part to come in. By the time it was due back at the dealership to correct the problem, it wasn't doing it anymore. I did pour in a can or two of gas treatment, and haven't experienced the problem since. Exception being one tankful of regular unleaded since, and it seemed like I experienced the (MDS/bogging) problem one evening on the highway. Went back to the higher octane the next fill-up, and seemed to have gone away.
Conclusion: 1) Delicate sensors/electronics that don't like rough handling during an oil change. 2) Pick a grade of gasoline and stick with it. Engine management doesn't like changes.