Need the XJ to run HOTTER
10-20-2014, 12:14 PM
#17
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
Let me ask this question of u.....if the heated O2 sensor reaches operating temp within seconds of motor start-up thus signaling lean/clean running info, why would the system need to wait say +/-10 minutes for coolant temp to reach 195 to start signaling lean/clean running info? The sooner the motor starts running lean/clean the better, no?
Does anyone have an O2 sensor blurb/info stating something different than the blurb/link I post??????
10-20-2014, 01:26 PM
#22
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Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
You're confusing factory original assembly line procedure versus an optional field service replacement for many engines and car lines.
10-20-2014, 02:26 PM
#25
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Year: 1998
Model: Cherokee
Engine: 4.0
Oh my.....how the myths/false info continue to be perpetuated on the Internet and in forums.
The facts are, Jeep dealerships sold a 180F 4.0L t-stat and your engine enters "closed" loop within seconds of cold start-up. When the heated O2 reaches operating temp of 600F-650F is when the loop "closes, NOT when/because coolant temp reaches 195.
Folks.......please quit posting this false info.
http://www.picoauto.com/applications/lambda-sensor.html.
The facts are, Jeep dealerships sold a 180F 4.0L t-stat and your engine enters "closed" loop within seconds of cold start-up. When the heated O2 reaches operating temp of 600F-650F is when the loop "closes, NOT when/because coolant temp reaches 195.
Folks.......please quit posting this false info.
http://www.picoauto.com/applications/lambda-sensor.html.
If I remember to, I'll try to record a video of this later.
10-20-2014, 03:16 PM
#27
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
We see mid-teens every winter. The 180F Stant SuperStat has been in our XJ for 4 plus years. The heater will make u sweat even in mid-teens ambient.
10-20-2014, 03:20 PM
#28
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
DJ is absolutely correct. This is a longtime and popular myth. You can verify this on OBDII Cherokees using a bluetooth OBD adapter and Torque Pro. It has an option to show fuel status, and you'll find that when you start the jeep up, it goes into closed loop rather quickly.
If I remember to, I'll try to record a video of this later.
If I remember to, I'll try to record a video of this later.
Looking forward to the video.....it will be a great teaching aid and myth buster..........and the O2 sensor, not the coolant temp sensor, is what "closes" the loop on all other vehicles, not just Jeeps, as well.
.........and the t-stat does not have to be a 195F.
Last edited by djb383; 10-20-2014 at 03:28 PM.
10-20-2014, 04:15 PM
#29
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Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
All the while drinking ice cream slushes from Sonic.
Last edited by Firestorm500; 10-20-2014 at 11:53 PM.
10-20-2014, 04:16 PM
#30
I have a 160 degree thermostat in my Firehawk, and it gets plenty damn hot in the car!
Turn your hot water heater "UP" to 160* and see if you can keep your hand under the faucet for more than a half second!
However, for the OP, you should get rid of the "Failsafe" thermostat........
I had two in a row fail open at regular operating temperature.........
Once was in December when we had a super cold snap..........Drove to work for a few days freezing my *** off, cause the Jeep didn't even reach 100 on the gauge...........It was below zero that week
Turn your hot water heater "UP" to 160* and see if you can keep your hand under the faucet for more than a half second!
However, for the OP, you should get rid of the "Failsafe" thermostat........
I had two in a row fail open at regular operating temperature.........
Once was in December when we had a super cold snap..........Drove to work for a few days freezing my *** off, cause the Jeep didn't even reach 100 on the gauge...........It was below zero that week