O2 sensor heater fuse
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Senior Member
Joined: May 2012
Posts: 602
Likes: 13
From: Salt Lake City, UT
Year: 1998
Model: Cherokee (XJ)
Engine: 4.0
O2 sensor heater fuse
Don't underestimate how this could be affecting idle after a cold startup.
Now that the weather was turning colder here in UT, my XJ was starting up fine, but the first minute or so the idle was very rough. No codes were being thrown. My O2 (NGK) sensors are just a little over a year old, same as my IAC.
I looked at the blue 15 amp fuses in the PDC, none appeared to be blown, but they were corroded/brownish at the contacts. Threw in all new fuses last night and this morning no rough idle despite it being the coldest morning of the year so far.
Just some info, YMMV.
Now that the weather was turning colder here in UT, my XJ was starting up fine, but the first minute or so the idle was very rough. No codes were being thrown. My O2 (NGK) sensors are just a little over a year old, same as my IAC.
I looked at the blue 15 amp fuses in the PDC, none appeared to be blown, but they were corroded/brownish at the contacts. Threw in all new fuses last night and this morning no rough idle despite it being the coldest morning of the year so far.
Just some info, YMMV.
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
Don't underestimate how this could be affecting idle after a cold startup.
Now that the weather was turning colder here in UT, my XJ was starting up fine, but the first minute or so the idle was very rough. No codes were being thrown. My O2 (NGK) sensors are just a little over a year old, same as my IAC.
I looked at the blue 15 amp fuses in the PDC, none appeared to be blown, but they were corroded/brownish at the contacts. Threw in all new fuses last night and this morning no rough idle despite it being the coldest morning of the year so far.
Just some info, YMMV.
Now that the weather was turning colder here in UT, my XJ was starting up fine, but the first minute or so the idle was very rough. No codes were being thrown. My O2 (NGK) sensors are just a little over a year old, same as my IAC.
I looked at the blue 15 amp fuses in the PDC, none appeared to be blown, but they were corroded/brownish at the contacts. Threw in all new fuses last night and this morning no rough idle despite it being the coldest morning of the year so far.
Just some info, YMMV.
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