Usually, NoP2, the main stage pressure, which should be at or near 300bar (4350psi), is also reduced. However, on nozzles which have many miles and much wear, especially ones that the pop pressures have diminished, block 13 is not going to give usable information on balance.įor example, we often find that the pilot pop has diminished from the 220 bar (3250psi) pop pressure, to usually around 170 bar, or 725 psi loss. By using the VCDS/ engine module/ measuring blocks/ block 13 (idle balance) and block 15 (liter per hour fuel usage), we have been able to determine if new injectors are working 1) well with one another and 2) if the fueling usage is close to spec. It's probably been more than 10 years ago, we discovered 'not all injectors are created equal'. The rest of this conversation has to do with the 2-Stage rotary pump injectors. You will always have to replace the TTY hold down bolt. If a any of the lower black seals are cut, fuel will leak back to the fuel return galley and power will be severely diminished. Sometimes you can reinstall the seals without replacing, but if you cut it, it's done for. The burr must be removed before reinstalling the injector or you will cut the seals. I would caution, there is a burr that is caused by the PD injector body leaning against the aluminum cylinder bore.
Some will swap two deviating injectors to be sure it's not the cylinder or bad cam, as we pioneered many years ago. Veedubmad might get lucky and try Liqui-Moly Purge, which isn't very likely to work, or replace the worst injector. When the number 2.99+ or 3.01- comes up, you are usually looking for new injectors. Veedubmad's injector quantities have to be a PD, as those are the kind of deviation numbers we see with PD's.