What are Injector Balance Rates and IQA Codes? Injector balance rates and IQA codes are two different things but they are also connected. These terms can be complicated so lets break it down for the crayon eaters. Balance rates are adjustments made by the vehicle engine computer to "balance" injector output. This creates a smoother running engine, quieter injection and better performance. Nothing is perfect in this world, engines and fuel systems are no different. Two exact same fuel injector...
