My 2010 Fusion with a build date of 11/2009 has been showing some flares between shifts when it's cold and it has sat over a weekend. The first few shifts usually from 2->3 will show a slight flare. After that things are fine and I don't see this behavior letting it just sit over night.
This past Monday was probably the worst yet though. It flared several times from 2->3 and 3->4 during the first mile. Probably 4-5 times.
My car had the 10B15 service (reprogrammed the PCM at 2200 miles). Currently has a little over 7100 miles.
So, it's going to the dealer in the morning. They are going to let it sit and try to check it on Friday. I'm hoping they are going to be able to replicate and pinpoint the problem. Since mine falls in the time of the suspect valve body bore issues, I'm guessing this could be a valve body problem?
Here is a clip of the flare I captured yesterday. It's brief, you may need to crank up the volume to hear it rev a bit:
So, we'll see how it goes.
Edited by con_fusion, 20 October 2010 - 08:27 PM.