1990 XJ 4.0, new Bosch 19# fuel injectors, flowmaster 50 exhaust, working EGR valve and new CCV plumbing.
I've been reading other peoples' reports of failed emissions tests trying to get a clue about why I failed with very high CO readings at cruise and idle. CO levels are 5X higher than limit. Obviously two possiblities come to mind: O2 sensor and cat. Do the high CO levels point to one or the other? HC level also failed, but was just over the limit. Thanks for any help.
I've been reading other peoples' reports of failed emissions tests trying to get a clue about why I failed with very high CO readings at cruise and idle. CO levels are 5X higher than limit. Obviously two possiblities come to mind: O2 sensor and cat. Do the high CO levels point to one or the other? HC level also failed, but was just over the limit. Thanks for any help.