Contribution Test Failure
1994.5 F250, 5 speed, 208,000 miles.
Engine has slight miss at idle...
AE Contribution Test displays DTC's
P0263 Cylinder 1 Injector Circuit Contribution / Balance Fault
P0269 Cylinder 3 Injector Circuit Contribution / Balance Fault
During he Contribution Test I can count 6 cylinders that make engine rough running and 2 that hardly make any difference, guess these must be #1 & #3 cylinders.
Is it just a coincidence that #1 & #3 are on the same uvch?
If there was an electrical problem would it necessarily set a DTC?
All injectors buzz at equal volume during Buzz Test which should rule out electrical issues?.
What are my next step's?