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Just asking for some advice i have a 51 reg 172, occassionally i get a knock noise when i lift off the acelerator, either to brake or change down gear...dunno what it is, but sounds like its coming from the front drivers side area......
It sounds like the top engine mount on the drivers side to me. A common fault I've had fixed on my last two Clios. Although it's started doing it again recently.
If you potter along in first at a low speed then lift does it do it pretty much every time? Is so that's what it will be.