Hi all after some advice if anyone can help on my 54 Vauxhall signum 1.9 cdti. It started with a little bit if black smoke the other day and then finally it went into limp mode and lost a lot of its power, it's bit in limp mode anymore but still no power. There are no fault codes present and iv done the following so far, removed inlet and blanked of the swirl flaps as there were scrap and has been for ages, cleaned egr still the same so changed that for another, split the exhaust before the dpf to see if that was blocked still the same. I have just checked the butterfly on the throttle body and that never moves so that's next to swap but wondered if anyone else has had and solved this problem. Any help would be much appreciated. Thanks