david_brenchley
Member
I have a knock from the front of a w210 320 CDI engine (2000 & 110,000 miles). Sounds like no1 cylinder, have replaced 4 cam followers on no1 and have renewed the injector on this cyl also, all others have been cleaned. Still have the same knock. Have now stripped off the inlet manifold as I was told it may be one of the flaps broken off and now in the cyl, but all flaps intact! The EGR valve came up as a fault, but is only a year old and the car has done less than 10,000 since replaced, can I test this off the vehicle? The inlet manifold is full of a black tar like substance and there is a lot of it, it is also completely covering the flaps (although they are working correctly) is this normal?