Originally Posted by
Simont122
Have checked the air shut of valve and it seems to be fine.
Doing so, I did notice the hose which leads to the manifold has a big split in it. Maybe this is the cause, will pick up a new one from the scrappy Saturday as it's a dealer only part and they want £64+ VAT. For a hose!!
The battery is a year or so old and is fine, even when jump leads connected to another car there is no difference.
That would cause a lack of boost pressure/poor performance and black smoke when driving, shouldn't effect the starting at all.