Car : A4 B5 1.8T Quattro Sport Dec 1999.......... For a while now my car has an annoying engine rattle - like a bag of nails ! Originally thought it was perhaps the cam chain tensioner, but I changed this a few months ago, same rattle exists, gave the engine a flush with wynns engine oil flush twice, replaced the oil filter with the bigger transporter type oil filter and 5w/40 oil, oil temp much better and engine runs smoother, still have the annoying rattle though (disappears at 2000 rpm - comes back at idle) the main area that the rattle comes from is directly on top of the fuel pressure regulator when a screwdriver placed ontop then stick your ear to it - had the top off it but looks ok, the small 3.2mm tube that runs from the inlet manifold to the fuel pressure regulator is showing signs of the braiding being damaged, maybe a vac leak? so obtained a new fuel pressure regulator from GSF and tube, which I am going to fit tomorrow, hopefully this will stop the rattle - the last resort is the sump off and new oil pump and pickup, or could it be the hydraulic lifters worn on the actual cams? Any advice anyone ? Anyone else had this problem? I will post the outcome of the situation after the fuel pressure regulator change to see if it makes any difference.