I have had an issue with my Vivaro for quite a while now. There is a puffing sound when the engine is under load. At a rate as it could be from one of the cylinders firing.
There is exhaust smell in the cabin and it's now time to do somrthing about it. I have removed the plastc parts to reveal a lot of soot under the air filter housing, and around the manifold. This seems like an awful tight place to work, and I am afraid i have to drop the engine to get to fix this. Anyone here that has done this before or can come up with some adwise, would be very much appreciated!