When you clean the injectors have them done on a cleaning / testing rig. Avoid add-to-the-petrol fixes - they don't. More frequent oil changes will reduce the carbon / gum deposits.
Good - Fast - Cheap: Pick any two.
3 x E32 735iL (Alpine White, Glacier Blue & Kashmir Beige); 2 X E38 735iL (Oxford Green & Alpine White); E53 X5; R50 Cooper; R55 Cooper Clubman.
E38 Parts Car
E21 318i; E23 735i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
I've just changed my wiper blades and now my reverse lights don't work. Should I change my fuel pump relay?