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Engine stumble/hesitation around 2500 RPM?

 
  #31  
Old 05-03-2013, 10:51 AM
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Originally Posted by ChuckJ View Post
Is this when it is warm or cold? And is it a smooth reduction of power surge or misfire?

ChuckJ
Doesn't sound like an engine misfire. Almost feels like you hit a slight bump in the road. I think it might be PDK related, but some here have felt it on their manuals also.
 
  #32  
Old 05-03-2013, 11:25 AM
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Originally Posted by ChuckJ View Post
Is this when it is warm or cold? And is it a smooth reduction of power surge or misfire?

ChuckJ
Definitely warm engine. Happens under gentle or aggressive acceleration. Doesn't seem like a misfire. A noticeable skip in smooth power delivery. Doesn't just skip once but a few times as you climb through that range 2500-3500.
 
  #33  
Old 05-03-2013, 11:45 AM
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I forgot to ask you guys if it was a 3.4 or 3.8, but my 3.4 definitely does not do that. It used to have a slight problem right after you started it and then got in that area, but I took it in for a fluids top off and they did something to fix that.

I would definitely take it in.

ChuckJ
 
  #34  
Old 05-03-2013, 12:42 PM
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2013 C2S here, same problem as everyone else. Stumble around 2500-2800 rpm. Happens cold and warm, most noticeable in 2nd and 3rd gear. Goes away in 4th and higher gears. Mostly just annoying. Also I have 1015 miles on the clock.

Anyone getting anywhere on this? My service dept at Jim Ellis in Atlanta won't do anything without Codes or Cel. They always say issues like this are normal and will not look into it.

Also on a side note they say the 991 electronics are not compatible with any Apple phones besides the 3GS *laugh*. I have an Iphone 5 which randomly will not present an AUX bluetooth interface. They were able to reproduce it and actually replaced the entire PCM. Issue is present on the new one as well across devices such as the Iphone 4s, 5, and android based handsets. It happens about 1 in 5 pairings and can be resolved by shutting off the car locking doors and totally restarting the PCM. I took a video of it and sent to Porsche and I am certain it is a bug.

Jim Ellis just took the "New devices" like the Iphone 4, 4s, 5 and all android handsets arent compatible yet. Really bad service on their part.
 
  #35  
Old 05-03-2013, 01:25 PM
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I wonder if the quality of gas has any bearing on this. I definitely notice a difference when I use anything but 93 octane Shell or Chevron gas. Now I won't use any other brand.
I haven't noticed any gear problem on my new 991 C2S pdk, now a month old.
 
  #36  
Old 05-03-2013, 02:06 PM
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Originally Posted by hockeyguy4u View Post
I wonder if the quality of gas has any bearing on this. I definitely notice a difference when I use anything but 93 octane Shell or Chevron gas. Now I won't use any other brand.
I haven't noticed any gear problem on my new 991 C2S pdk, now a month old.
That's a good point hockeyguy; I always use Shell 93 now and I may have started using it more consistently after I took the car in.

ChuckJ
 
  #37  
Old 05-03-2013, 03:55 PM
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Mine does it warm or cold. Felt mostly in 2nd and 3rd gears but I can get it to do it in any gear if I accelerate briskly from very low RPMs (not quite lugging the engine, but close). teebo, let me know if you get Ellis to address it. Mine will be going to Hennessy after I'm done breaking it in, but I can see how they might say that they can't feel the stumble.
 
  #38  
Old 05-19-2013, 10:25 PM
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Started happening today right around 2500rpm.
A 2012 3.8 MT with 3400 miles.
Not sure if the OP or another else found a resolution for this issue.
Thanks
 
  #39  
Old 06-05-2013, 09:26 AM
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So I finally took it to the dealer to see if there was a solution to this. They told me there was a software update for the PDK, so I was optimistic that that might improve things. I got the car back today, and it's as bad as before. It's really annoying and it's taking the pleasure out of my new car purchase. I can't believe more people aren't noticing this.
 
  #40  
Old 06-05-2013, 01:00 PM
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This is a new "development" that was certainly not there during the first 2000 miles.
Once you recognize it and become aware of it, it really does detract from the driving experience. Mtony - I feel your pain.

Perhaps more people aren't noticing it because it is so much more pronounced during casual driving and not when flooring it. Definitely a dead spot.
 
  #41  
Old 06-06-2013, 01:39 PM
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I've never experienced this, my build was early May 2013.
 
  #42  
Old 06-06-2013, 02:52 PM
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My car does not do this. August 2012 build.
 
  #43  
Old 07-25-2013, 07:14 PM
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So I drove another C2S at the dealership where I bought my car and it also had the slight hesitation between 2600 and 3000 RPM. It wasn't quite as bad as mine, but definitely noticeable. Hard to believe that others haven't noticed this.
 
  #44  
Old 07-26-2013, 06:26 AM
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I notice it as well but mine is right at 3k. I mine its very noticeable. The engine sounds and feels different. It has been like this since I got it. I really have no idea what it is, im getting used to it now and don't notice it as much. But if I pay attention it's still there.
 
  #45  
Old 07-26-2013, 06:36 AM
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I do notice it on my car (not on the testdrives though). It feels lilke the engine breathes through a straw for a second before it gets a full breath.

But I can't quite replicate it. Not always does it occur, and not always at the same revs. It is less noticeable in sport mode though !
 

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