Lets say you have a starting problem, you take your
injectors to a local garage or motor factor they in turn send them away for specialist repair. The injectors are tested and the report comes back to you "All the injectors failed test, you need another set we can supply at £195 each!". Now lets be clear
about this unless you have had a serious contamination issue it is unlikely all of the injectors are the cause. Yes they may be slightly out of parameter but they are not the cause. A typicle Bosch injector will have a maximum permissable spill return value
of around 40mm now lets look at an example of a failed set of injectors.