1990 Ford Bronco Q&A
1990 Ford Bronco Question: Keep getting code 42 on KOER test. Changed o-2 sensor. Shows always rich.
Think you have more problems then an o2 sensor. Leaky injectors/pressure regulator. Trying to remember, Warm up engine - test the gry/lt-blu wire and ground. Idle should be 0.1-0.9v, increase engine speed voltage should increase and decrease as rpms drop. If it doesn't work as stated it's probably bad. - ProfessorG
Full size Bronco? If so which engine? - pushrod
AGREE WITH #1 - globalhelper