wright1889

Hello all, i've had to resort to your forum to see if anyone can make sense of a problem i have with an X3 3.0d M Sport (manual). it seems that the local main dealer can't suss it out and neither can a local independent, so here goes.... About 8 months ago i took the car to the main dealer as in the mornings when i started it up it either cut out or it went up and down the revs for about a minute and when driving it seemed to be 'missing'. My very limited knowledge told me it could be an injector(s) problem. The main dealer had it for a day and gave it a clean bill of health... I then took it to one independent who said 'yes mate it's your injectors do you have 3k' i then left swiftly. I ran it for a week or two and the problem seemed to go... until about a month ago when the problem got worse ten fold. When driving now there is a distinct noise coming from underneath the car every now and again which i could only describe as a dull clunk/knock, this is in addition to the problem of it missing which is as bad as ever, there is a shudder when this happens! The next garage i took it to were also baffled, they checked the tyre sizes which checked out ok and stripped the rear axle/diff to inform me that they're no nearer to finding a solution but it aint the injectors!! No faults show on the computer, the only thing he thinks it could be is a worn pinion??? If anyone has any idea what this could be or suffered it yourself i would really appreciate any advice you may be able to offer. Thanks in advance Frustrated