Yeah I've heard about injector problems, xentry also lists it as a possibility too and there is a procedure for checking the values, I just can't get my head round it, it gives min and max values for specific ranges, but I don't know how much would be bad and cause this issue. Will take another look tomorrow and post the info, see if anyone can explain it.

I kinda ruled out compression or injector seals, as the customer said it was same with the original lump, it does point to injectors but I would like to prove it first.