Balance rates are an indicator of how evenly each cylinder is accelerating the crankshaft. Anything that affects cylinder firing "strength" will affect the balance rate readings. We have heard of normal things, such as valve lash and low cyl compression (copper seal, loose injector cup - LB7, rings, head gasket...) affecting balance rates. We have also seen a few unusual things such as bent connecting rods causing high balance rates as well. So there are a number of things besides injectors affecting balance rates, and those should be eliminated as possible contributors before removing the injectors.
To help determine if the root cause is related to the injectors, or one of the other items mentioned above, exchange the injector in the questionable cylinder with one from another cylinder. If the excessive balance rate does not follow the injector to its new position, begin checking the engine related items listed above. If the balance rate does follow the injector, the injector needs to be repaired (if possible), or replaced.
