taximark

I had exactly the same problem with my 2.0HDI and you will find probably find that the problem is the crankshaft pully driving the auxillary belt. The symptoms are a bit misleading because it appears that the tensioner is jumping about , causing the rattling, but in fact the crankshaft pulley is a two piece unit with a pulley within a pulley (for the want of a better description) which is designed to absorb vibraton and make the engine smoother. When this becomes faulty, it tightens / slips and the end result is that the auxillary belt alternates between tight and loose, the tensioner gets loaded / unloaded, and quite probably the auxillary belt gets cracked or shredded. Be warned that if the engine is run for any length of time in this condition it can lead to the timing belt breaking, due to the constant under heavy load / no load scenario.

I have a 2.0HDI 110 (auto gearbox) and had a diesel tuning box fitted last year. Ever since, the gearbox struggles to make it's mind up what gear it wants, and the end result is that the gearbox doesn't seem to be strong enough to cope with the extra power, frequently sticking in gear (requiring a gearbox re-set) and causing ecu problems.Speaking to various mechanics ( both citroen and independant) it seems that half the problem is that citroen say the gearbox is a sealed for life unit requiring no maintenance, but they definitely last a lot longer with regular oil changes, although the gearbox is a weak point anyway.The end result is that I now need a new gearbox and would recommend saving your money and just save up for the 2.2HDI, which is a far better engine anyway.The other problem I have had since fitting the tuning box is various electrical faults beinng shown on the cabin display, which I am told is due to the fact that the tuning box over-rides the ecu and confuses the onboard computer.