Join Date: Dec 2013
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I'm glad I'm not the only one.
I purchased the car in November. Noticed the issue at around 1000-1500 miles. The car now has 2200 on it. It performs decently when warmed up, although sometimes it's still apparent. I have noticed that it is worse when accelerating on on-ramps (cloverleaf) when there's a turn associated with uphill climb to the highway. I'm guessing it's load related.
Winter blend varies here, but it really came on with the very cold weather here at which point they would have put a ton of additives to help combustion/starting/emissions.
It is noticeable in first to some degree, second is the most prevalent, with all other gears fine.
The tech at the dealership stated that its the 'nature of the beast', although I don't think he was able to duplicate it. He did, however, seem knowledgeable and spoke with me for 10 minutes about the engine/transmission (I'm a tech/car junkie). The transmission shares clutch packs on 2-4-6 and 1-3-5, so if it was a mechanical issue in the transmission, it should show up. Also, he stated that at 7mph the converter goes into full lock-up on acceleration and uses a pre-load on the clutch packs for the next gear to facilitate a small amount of slip in between gears without having to unlock the converter.
No misfire showed up (cars will throw a MIL if they get too prevalent - with this issue, and how it feels, I think it'd throw a code).
At this point, I'm thinking it's gas blend and ECU tuning related to fuel pressure/flow/injector duty cycle. I do know from previous open-source tuning I've done that vehicles will change tables for timing/duty cycle on injectors, etc. based on current gear, load, temperature (intake), etc.
My plan is to pull the positive battery cable and let the ECU clear its learned tables. If the problem goes away, I'm thinking software. If not, then???