Hi all, as the title suggests really, the recently resurrected T4 has started to puff a bit of blue out the back again, but only in certain circumstances.
If I coast along off the throttle and in gear, such as going down a hill above 1800rpm, no smoke, if I do the same below about 1200rpm then still no smoke, if I leave the car idling then no smoke, BUT, if i coast between roughly 1300 to 1800rpm then a nice blue puff out of the exhaust when I first touch the throttle again, nothing on boost or off boost when accelerating, and as already said, nothing after prolonged idling as before with the old engine, just between these specific revs, so at a stab in the dark it's possibly vacuum related, but then again with the RPMs it happens at being so specific maybe it isn't.
Any ideas people?
Many thanks in advance
