My 2009 JCW Clubman just had the timing chain tensioner service done and while the so called death rattle is completely gone I have noticed that on two or three occasions during the last 3 weeks shortly after starting off and if I give the car a little throttle - not a lot - I feel none of the expected surge in power but at the same time I hear a deep throated exhaust tone. This has happened as much as 5 or 7 minutes after setting off. The RPM is likely in the 2 to 2.5K range. Once the car has warmed up the car won't do it.

Based on the repair receipt I have a feeling some software was updated so I am trying to decide if this is a hardware or software issue. The condition was definitely not there before they did the timing chain service.

Any comments are appreciated.

 

Was there an installed software update according to your service paperwork?
It would be listed if there was such done.

- Erik

 

I looked at the paperwork and there is no mention of software on my JCW but on my daughters S they did update the software - seems odd to me they would do the software on one and not the other. Both cars were done within a week of each other at the same dealer.