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So after 2 weeks since doing the tensioner and gasket mod and cleaning the MAP sensor the engine runs and sounds much better and no more start up rattle, even from cold. It's a tricky job and alot of it by feel as you can't really see behind the Egr valve but it's a do-able job and worthwhile. The small steel pipe from the egr to inlet manifold was full of oily gunge and so will the inlet manifold I imagine but I'm not taking that off !!
I also solved the problem with mine.

Sold it, so now it will be someone else's problem (Sold it to a Vauxhall dealer, they will know about the problem, so if they sell it on without fixing it, it will be them, doing something bad :) )
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81 - 81 of 81 Posts