So I am seeing VVT oscillation (+/-5 degrees) during cold start/warm-up. The car is a 2015 challenger 5.7 with a 6.2 cam. What is interesting is the oscillation does not start until VSS hits 3mph and then it seems to stay even when car is not moving but idling, which I thought anything but full advance was not possible. My biggest concern is why would VVT oscillate when desired is rock steady...it's like the cam position constantly over/under shoots? Now I vaguely remember with the stock cam and tune during cold starts the car would kind of fish bite when engine was still cold but I have no logs containing cam position. I must admit in the back of my mind I was thinking...did I nick a cam bearing? I don't have the log on hand but can post it up and the tune (work in progress) when I get home. The plan was to get the car dyno tuned by a pro but still struggling to find a shop in Chicago land area that doesn't tune for "off road" use only, meaning I need to pass emissions. Anyways, just thought I would ask if you guys have seen this behavior before? I never did a cam/crank varition relearn when I installed the 6.2 cam so wonder if that is the problem?
Nevermind, I think I know what the problem is...in my infinite wisdom I copied over the cam training values from the 6.2. We'll see when I get back to the garage later today.
VVT oscillation.JPG