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1990 jeep cherokee laredo 4.0 oxygen sensor

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HarryHydro
 
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Default 1990 jeep cherokee laredo 4.0 oxygen sensor - 04-24-2006 , 08:52 AM






Hi Folks:
Just a tech question, really. I just read that the oxygen sensor in
this jeep is titania, as opposed to zirconia, and therefore doesn't
generate voltage. I've read the computer puts 5V through a fixxed
resistor in series with this sensor. I think it's saying the computer
is looking for 2.5v as a good voltage. Also, it mentions it going from
0 to 2.5v. Mine seems to pulse at about a 2 seconds on, 2 seconds off
rate. It's not at 2.5V on though, but more like a half volt (like a
zirconia?) My Jeep seems to run smooth, but maybe running a bit rich,
and I think ignition retarded. Might this be a temperature sensor
going bad? Temp gauge reads normal. No indicator lights, but I think
this computer might be rather 'old-school'. It was doing this thing of
stalling when it was warm-started, which would fix itself after
restarting, but that went away when I had some battery problems and
lost good contact with the terminals. (computer reset itself?)
Is this computer behaving? Are these voltages normal?
Thanks!
Harry


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Mike Romain
 
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Default Re: 1990 jeep cherokee laredo 4.0 oxygen sensor - 04-24-2006 , 11:26 AM






If it hasn't been done the O2 sensor on that Renix system is under
recall. We had our 88's replaced free a couple years back.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

HarryHydro wrote:
Quote:
Hi Folks:
Just a tech question, really. I just read that the oxygen sensor in
this jeep is titania, as opposed to zirconia, and therefore doesn't
generate voltage. I've read the computer puts 5V through a fixxed
resistor in series with this sensor. I think it's saying the computer
is looking for 2.5v as a good voltage. Also, it mentions it going from
0 to 2.5v. Mine seems to pulse at about a 2 seconds on, 2 seconds off
rate. It's not at 2.5V on though, but more like a half volt (like a
zirconia?) My Jeep seems to run smooth, but maybe running a bit rich,
and I think ignition retarded. Might this be a temperature sensor
going bad? Temp gauge reads normal. No indicator lights, but I think
this computer might be rather 'old-school'. It was doing this thing of
stalling when it was warm-started, which would fix itself after
restarting, but that went away when I had some battery problems and
lost good contact with the terminals. (computer reset itself?)
Is this computer behaving? Are these voltages normal?
Thanks!
Harry

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