Above: Plunger in foreground, and Barrel behind it. Notice the helix cut spiral around the plunger, also note that piece down a bit from the left end, this tang slips into a slot on the ring gear and it turns the plunger and adjusts the position of the helix to alter the pump stroke, (amount of fuel delivered per stroke of the pump). Helpful tips when removing a GDI Injector on a GM V-8 engine.To learn more, visit: Place the cylinder at TDC. Clean the bore but do not dump carbon into the cylinders, best to remove the GP and if major amounts of carbon are found, then use a vacuum to clean/suck debris out through the injector or GP hole. 93 F250 7.3 IDI S/C XLT 4X4 E40D 3.55LS, Captains chairs, Tutone Mocha, Leer 48" Hiboy cap, FR & RR hitches, full DeeZee I would think the power balance would show one cylinder pulling back. It might, but maybe not enough to be noticable. A Contribution test will be more telling, but you need Ford IDS to do a true contribution test that sets all injector trims to zero during the test. I wouldn't be so sure it's a stuck injector though and not something else. 0:30 engine crank but no start2:00 remove heater blower 2:50 remove engine breather3:30 rusted diesel injectors3:40 injector connector rubber grommet missing Zek6Q.