Rough Pedal
01-15-2012, 07:06 AM
#31
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Year: 1994
Model: Cherokee
Engine: 4.0l
This probably is rellavant but I thought I'd share, few years back when I had my 98 I had the same issue. I ending up thinking it was my injectors I know my xj was newer and didn't have the renix but it turned out to be both upper and lower o2 sensors.
01-15-2012, 12:32 PM
#33
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Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
It does ignore the O2 at 70% throttle like you say, but I believe that if the O2 sensor is bad, the ECU has already defaulted to a pre-dettermined fuel map.
That said, I wouldn't doubt that there are plenty of Renix Jeeps running around with bad or "lazy" O2 sensors that need replacing.
That said, I wouldn't doubt that there are plenty of Renix Jeeps running around with bad or "lazy" O2 sensors that need replacing.
I wonder, could it be, the "default" get's you by through low and medium rpm, but you need to kick into open loop (70% +), to get enough fuel for more RPM/harder acceleration.
Last edited by DFlintstone; 01-15-2012 at 02:16 PM. Reason: when ,
01-15-2012, 01:39 PM
#35
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
01-15-2012, 02:29 PM
#36
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Year: 1992
Model: Comanche
Engine: 4.0
Originally Posted by cruiser54
We don't have but one O2 sensor.
01-15-2012, 03:55 PM
#37
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Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
90 was the last year for Renix, just one there I guess. I've seen allot of posts saying the rear sensor on the newer is only to monitor cat function. (and cause headaches). Only the front "effects injector pulse length".
I haven't personally read the FSM there on that.
I haven't personally read the FSM there on that.
01-15-2012, 05:28 PM
#38
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Year: 1990
Model: Cherokee (XJ)
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