:rolleyes: Help, my TDI has just developed a horrible deep throaty noise. It only occurs at lower revs, and probably dissapears once I go above 1800 rpm. When changing gears it almost sounds as though there is a backfire or a misfire. The exhaust is sound, and the noise occurs when stationary, not in gear and without the clutch depressed (though I am). Any ideas - can it be a misfire with it being a tdi - I don't even know if a tdi has spark plugs . Could it be a turbo fault as the noise dissapears at 1800 revs (can the turbo jam open). any pointers would be useful cheers corskey