Hi Mike.as kevin has siad you code/callibrate the injectors on these engines.It would not suprise me if all four are no good .We have had this before done by diesel experts only to find they have nothing to test them with.We now have our own cr injector tester you be suprised how many new ones are faulty never mind supposedly recon ones, we now only fit new and we test them before we fit.Mike McDowell