Sounds like an air leak if the revs are going up.
@ OP have a look and smell between the engine and gearbox, if it's fume smelling you probably have a cracked egr pipe and the crack was acting like a whistle until it got bigger, best time to check is from stone cold. You probably won't be able to see the split in the metal pipe but if the smell is there it's split, it goes at the rippled vibration sections. hth.
|