Can someone please help. I have a xtype 2.2 diesel they keeps losing power. I have changed the EGR valve and the alternator for new ones but it still happens. The mechanism said perhaps the alternator is defective and another said it may be still the EGR valve . The car runs perfectly otherwise . When it loses power I just have to stop and start again and it is again perfect.

 

Hi, I am a little bit unsure, to what you are referring to exactly, when you are asking about "power loss", as you swapped the EGR valve (which would indicate that your problem is engine power loss) and you swapped the alternator (which would indicate electrical power loss). But in summary I have a feeling that you have engine power loss. So, please clarify that for others to be able to help you better.

You have a diesel - and I know nothing about diesel. If it would be a petrol powered engine, I would recommend swapping the fuel filter, as this is always a good idea, is easy, cheap and may well be the problem. But I have a feeling that diesel engines also do have a fuel filter...

 

I have been thinking again about your issue (assuming your issue is engine power) while sleeping:

Even if I know nothing about diesel, the core principles should be the same as on petrol engines:

If your issue is not some kind of sneaky electrical failure, I see those 3 core requirement for any engine to run properly:

1. Sufficient incoming air: Requires e.g. a clean air filter.

2. Sufficient incoming fuel (in your case diesel): Requires e.g. a clear fuel filter - and assuming you have fuel injectors: Nothing to be in there (like dirt), which
blocks those injector nozzles - note that this blockage could be intermittent, as dirt can move).

3. Sufficient "exit-way" for exhausts: If dirt (dirt particles) - and there would be a lot of those in diesel engines - piled up somewhere it could hinder the flow
of the exhausts. This - on a petrol car - could be dirt in a catalyst. And I believe that the equivalent of a catalyst on a diesel might be the particle filter.
Again: Dirt can move and if those particles in the particle filter intermittently block the pathway for the exhausts, this would explain your issue...

I hope this leads you on the right track. I don't believe they had diesel X-Types in the US. But that does not mean that someone there does not know something about diesel engines in general...