- Location
- on the beach in Ocean View, VA
I'm trying to wrap my brain around what might be a very simple question:
Will the ECU ignore an O2 sensor that reads rich or lean if it sees an injector circuit fault at the same time?
back story with specifics:
-- 1994 XJ with 2.5L low output 4 cyl.
-- injector circuit malfunction code (27) and dead miss last Sunday
-- gas dripping out of drain hole in the muffler (stuck open injector)
-- used Matco version of Snap-On's "the brick" code reader to determine that injector 3's circuit is F.U.B.A.R.
-- unplugged the faulty circuit's injector and still had a dead miss (duh)
-- dripping gas stopped and I reduced the chances of polluting my "new" catalytic converter until I could dig deeper
-- changed injectors two days ago and solved miss :clap:
-- at no point during the 6 days of using this as a daily driver, did I get a rich mixture code (pig-rich with injector stuck open) nor a lean mixture code (unplugged injector after determining the correct one)
I guess the real question is:
If the ECU knows that there is an injector circuit malfunction, does the ECU ignore the O2 sensor being out of range?
anyone with the smarts to know how the ECU "sees" the problem is welcome to chime in!
she's fixed and running fine, I'm just trying to wrap my brain around why I never saw any codes for rich or lean mixtures.....
Will the ECU ignore an O2 sensor that reads rich or lean if it sees an injector circuit fault at the same time?
back story with specifics:
-- 1994 XJ with 2.5L low output 4 cyl.
-- injector circuit malfunction code (27) and dead miss last Sunday
-- gas dripping out of drain hole in the muffler (stuck open injector)
-- used Matco version of Snap-On's "the brick" code reader to determine that injector 3's circuit is F.U.B.A.R.
-- unplugged the faulty circuit's injector and still had a dead miss (duh)
-- dripping gas stopped and I reduced the chances of polluting my "new" catalytic converter until I could dig deeper
-- changed injectors two days ago and solved miss :clap:
-- at no point during the 6 days of using this as a daily driver, did I get a rich mixture code (pig-rich with injector stuck open) nor a lean mixture code (unplugged injector after determining the correct one)
I guess the real question is:
If the ECU knows that there is an injector circuit malfunction, does the ECU ignore the O2 sensor being out of range?
anyone with the smarts to know how the ECU "sees" the problem is welcome to chime in!
she's fixed and running fine, I'm just trying to wrap my brain around why I never saw any codes for rich or lean mixtures.....