Comments on: More on the MCS Stumbling Issue http://www.motoringfile.com/2003/07/29/MoreOnTheMCSStumblingIssue/ MotoringFile | MINI news, reviews and opinion. MINI Cooper, Cooper S, Clubman, Countryman Thu, 09 Feb 2012 15:48:00 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Camcam http://www.motoringfile.com/2003/07/29/MoreOnTheMCSStumblingIssue/comment-page-1/#comment-1807 Camcam Wed, 24 Sep 2003 18:30:49 +0000 http://matthewgifford.com/2003/07/29/#comment-1807 <p>seems to me that de stumble disapear on my Cooper s with de ASC+T switched off!!!</p> seems to me that de stumble disapear on my Cooper s with de ASC+T switched off!!!

]]> By: tomorthway http://www.motoringfile.com/2003/07/29/MoreOnTheMCSStumblingIssue/comment-page-1/#comment-1806 tomorthway Wed, 24 Sep 2003 00:06:20 +0000 http://matthewgifford.com/2003/07/29/#comment-1806 <p>thank you very much</p> thank you very much

]]> By: Paul Deacon http://www.motoringfile.com/2003/07/29/MoreOnTheMCSStumblingIssue/comment-page-1/#comment-1805 Paul Deacon Sat, 02 Aug 2003 20:00:57 +0000 http://matthewgifford.com/2003/07/29/#comment-1805 <p>just a quick note the company that I believe did the Powertrain and NVH development was Ricardo - they are a independant engineering consultant based in the US</p> <p>Now I know that I will call a buddy who works their to see if they a "factory code developed for more performance - Typically they get backed of for driveability, emissions etc</p> <p>great site by rthe way just found you..</p> just a quick note the company that I believe did the Powertrain and NVH development was Ricardo – they are a independant engineering consultant based in the US

Now I know that I will call a buddy who works their to see if they a “factory code developed for more performance – Typically they get backed of for driveability, emissions etc

great site by rthe way just found you..

]]> By: Frank http://www.motoringfile.com/2003/07/29/MoreOnTheMCSStumblingIssue/comment-page-1/#comment-1804 Frank Wed, 30 Jul 2003 16:28:51 +0000 http://matthewgifford.com/2003/07/29/#comment-1804 <p>There is another very interesting fact acknowledged by the BMW engineers during Phobol's visit there. It appears to be that the stumble or engine stutter tends to become more pronounced when the gas tank is about 1/8 to 1/4 full, and the ambient temperature is above 90F degrees with humidity factor in the 30% to 90% ranges.</p> <p>While I continue to say that software version update 33.2 has been very clean so far for the Cooper CVT, this week I have experienced the engine stutter (RPM's suddenly dropping while the car is idling in "D" mode from 1,100 RPM to 500 RPM and then bouncing back) meanwhile the gas tank was at or below the 1/4 full mark and the exterior temperature was 95F+ and humidity around 85%.</p> <p>This problem doesn't happen when the gas tank is full or at least at by the 1/2 mark or either morning or night when both ambient temperature and humidity are lower than in the middle of the day.</p> <p>To me this is not a problem with the sensors in the car. All the sensors in the car do is to collect data and send it over to the main EMS2000 Siemens DME for further processing. There is definetely a glitch in the software because when the gas tank is low perhaps some sort of vapor lock forms in the tank, the sensors collect this information and add to the mix the high ambient temperature and humidity and bingo! You get a sudden stutter.</p> <p>I think this is the reason why these problems become so much more evident in warm weather and places with naturally hot climates.</p> <p>Very interesting findings...stay tuned.</p> There is another very interesting fact acknowledged by the BMW engineers during Phobol's visit there. It appears to be that the stumble or engine stutter tends to become more pronounced when the gas tank is about 1/8 to 1/4 full, and the ambient temperature is above 90F degrees with humidity factor in the 30% to 90% ranges.

While I continue to say that software version update 33.2 has been very clean so far for the Cooper CVT, this week I have experienced the engine stutter (RPM's suddenly dropping while the car is idling in “D” mode from 1,100 RPM to 500 RPM and then bouncing back) meanwhile the gas tank was at or below the 1/4 full mark and the exterior temperature was 95F+ and humidity around 85%.

This problem doesn't happen when the gas tank is full or at least at by the 1/2 mark or either morning or night when both ambient temperature and humidity are lower than in the middle of the day.

To me this is not a problem with the sensors in the car. All the sensors in the car do is to collect data and send it over to the main EMS2000 Siemens DME for further processing. There is definetely a glitch in the software because when the gas tank is low perhaps some sort of vapor lock forms in the tank, the sensors collect this information and add to the mix the high ambient temperature and humidity and bingo! You get a sudden stutter.

I think this is the reason why these problems become so much more evident in warm weather and places with naturally hot climates.

Very interesting findings…stay tuned.

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