Engine is perfectly driveable, perhaps a bit of a tappet-like rattle on one cylinder, but notably smelly at idle... I don't have a nose for these things, but it smells a bit rich... Does that mean the cats are up s*** creek (distinctly possible, but sounds expensive), or the MAFs playing up (i haven't removed it/ cleaned it at this point) ? HT leads and plugs are new. All the old plugs looked good on removal too. LH head gasket recently replaced. All injectors resistance tested consistently (although high end of expected range).
Any thoughts from our experts?