Hey all, so I don't have an exactly stock or normal fuel setup. Here it is:
-93 XJ
-01 injectors
-Returnless fuel rail and fuel check valve cleared out to go to external fuel pressure regulator, pressure set at just under 50 psi.
-01 intake manifold
-Wideband
So my XJ has been getting very poor fuel economy. I hooked up my wideband and noticed that on hard decel, its going really rich (~12 AFR, slowly eases back up to 14.7-ish after 5 seconds or so) According to the manual it should be basically shutting down the injectors and going lean. it is definitely not doing that.
Any ideas on a sensor that might be causing this? I can't remember, is there a closed TPS switch that tells the ECU when the throttle is completely closed?
of note: coolant temp is a bit cool due to exterior temperatures hovering around 0*F, but still around 195 or so. Quality 195 degree thermostat.
Other sensors i've tested/replaced in recent history:
MAP
stock narrowband O2
Coolant temp
air temp
TPS, though it may have failed since then?
Any ideas, those with experience tuning and modifying XJ fuel systems (seems to be very few people with that sort of knowledge, but thought i'd try.)
Thanks for the help!
-93 XJ
-01 injectors
-Returnless fuel rail and fuel check valve cleared out to go to external fuel pressure regulator, pressure set at just under 50 psi.
-01 intake manifold
-Wideband
So my XJ has been getting very poor fuel economy. I hooked up my wideband and noticed that on hard decel, its going really rich (~12 AFR, slowly eases back up to 14.7-ish after 5 seconds or so) According to the manual it should be basically shutting down the injectors and going lean. it is definitely not doing that.
Any ideas on a sensor that might be causing this? I can't remember, is there a closed TPS switch that tells the ECU when the throttle is completely closed?
of note: coolant temp is a bit cool due to exterior temperatures hovering around 0*F, but still around 195 or so. Quality 195 degree thermostat.
Other sensors i've tested/replaced in recent history:
MAP
stock narrowband O2
Coolant temp
air temp
TPS, though it may have failed since then?
Any ideas, those with experience tuning and modifying XJ fuel systems (seems to be very few people with that sort of knowledge, but thought i'd try.)
Thanks for the help!