I'm my case - Absolutely..

 

I did.

 

As aggressively as possible while remaining within the break-in parameters - as with all my previous Pcars.

 

Hi dux.. My car was born with the stumble but to be fair it's quite mild and doesn't detract... A bit like that stone chip that bothers you when you see it... Then you forget it's there until you see it again and the cycle continues. I'm just hoping it doesnt get worse because i can live with it for now...

 

You must be one the few that has this defect right out of the barrel.

Mine has the normal dip in the power range at ~3300rpm which is the very mild stumble that we all have.
But the 2500 rpm stumble and subsequent fishing line tug at that rpm is unmistakable and sadly not ignorable.

Sadly my passengers can't ignore it either...

 

You may be on to something here. In a contrarian way. I don't have the problem & I can say with absolute certainty that the recommended break-in as it relates to RPM < 4200 until 2,000 miles was NOT followed in my 991. My car has been in the 6,000 - 7,000 range since it had 40 miles on it.

Frank C.

 

Has anyone managed to get some quality video footage of the shuddering?

 

Mine has had the weird power loss since day 1 at around 2300 rpm under hard accel.

 

In my experience it's basically a seat of the pants sensation; nothing unusual on the tach or speedo. The only other symptom I get is if I'm in a tunnel or right next to a concrete barrier with the window down I can sometimes hear a distinct change in the exhaust note. (Especially with the PSE selected). I'm tempted to try to place a small mic near the exhaust and try to record it. (And yes, I'm getting desperate)

 

A buddy of mine has the same car as I do (2014 911 S M7) although it's a different color and he has this fish bite issue at around 2300-2500 RPM. No passengers have complained, but I can feel it when I drive his car, just tooling along at light throttle. He did not follow the US break-in procedure. He has not yet taken it to the dealer because he has little faith that they can do anything until Porsche comes up with a solution.

 

So far I've seen this mix of data:

- PDK and MT7 both affected
- 3.4 and 3.8 litre engines both affected
- Break-in both followed and not followed

 

Yep, same here. My passengers dont really feel it. Just me when driving it. Calling it fish-bite issue is actually a great way of explaining it.

 

My fish started out as a minnow but feels more like a largemouth bass now.

 

Update: Scheduled to take the car to a different dealer next week. I've never been to this dealer before, so it's a chance for me to get a second opinion. Will be riding with the shop foreman to get things rolling.

 

Was this at suggestion of PCNA?