Don't know about the problem when starting but mine is a 2007 MCS and I used to get a strange misfire now and again, I had several high pressure fuel pumps when it was under warranty, it never did cure it. In May of this year I had a de coke and it hasn't done it since so it looks like mine was a build up.
I know MINI will clean out the head for about £240 ish quid, they use crushed walnut shells I believe as a medium to blast out the deposits. Don't know anyone who has had this done so I'm not sure how successful it is.
Hi njsupplies. This sounds exactly like the problem I am having, my mechanic has replaced my fuel pump and still getting the same problem. Its resolved an issue of the car being very juddery when driving especially from cold but am still having the sam issue when starting. You start the car which is fine and then the revs just slowly drop until it stops and there is no saving it by using the accelerator
We had exactly the same problem with our 2009 MCS about a year ago. The dealer initially thought the problem was with the thermostat and replaced it.
This did not fix the problem and the car was still difficult to start (up to 6 times to get it running). Also the engine would die and then surge dangerously.
The problem was tracked to the High Pressure Fuel Pump and the replacement was fitted. In our minds the dealer gouged us - A$ 1550!! But what are you to do? Pay the money and take the car home with you, or leave it at the dealer!!
We have had no further issues with starting or running.
Yes, this problem seems to be a difficult one to diagnose. I have seen a few posts where dealerships have had two bites of the cherry to find the root cause.
Perhaps you could suggest to your dealer that the HPFP may be the cause and ask your dealer to check the BMW worldwide database. There will likely be several examples for them to compare with your particular issue.
2009 R56 Mini Cooper S: Chili Red, Black Roof, Black Wheels, ASC+T, SatNav, Very Cute!
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