Combines 670T engine miss

To tell which injector is bad, have the engine running at idle and crack open each injector one at a time. You will hear the engine miss when each injector is cracked open. If any of the injector's is bad, when you crack open the injector it will not make any difference in the engine ( not miss ). If I was doing the injector's I would have them all removed a taken to a shop that can test them to see if they needed to be replaced, before I went out a bought new one's. They are cheaper to replace, than your motor.

Fix it FAST! The 670 doesn't tolerate drooling nozzles! For some reason the Bosch fuel system is much better than the Roosamaster system, but when the engine starts to miss it normally is a nozzle going bad(drooling nozzle, it will score the sleeve wall and might damage the piston top and things just snowball from there. I own an 8030 and 8050 with the 670 engine and both were overhauled at the time of my purchase because of drooling nozzle damage to the engine.

Do I need a special tool to remove the injectorsIJ I have three engines I need to check.