1994 XJ Code 17
12-22-2013, 07:48 PM
#1
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Year: 1994 1993
Model: Cherokee
Engine: 4.0
1994 XJ Code 17
My '94 XJ has been idling lower than normal and my MPG seems a bit down. Today I decided to check my codes since the check engine light was coming on more than normal. (It's been on regularly for a O2 sensor code) Today there was a new code. 17. Which my manual says is "Engine running too cool" So my plan is to swap out the coolant sensor and thermostat. Is there anything else to check? Is there anyway a "running to cool" could affect MPG? I realize the O2 sensor will affect that but I've been getting the O2 sensor code for awhile now and this newest MPG loss seems related to something new. Thanks
12-22-2013, 09:09 PM
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Year: 1996
Model: Cherokee
Engine: 4.0
is the temp low on the gauge? like 150 or so?
your thermo probably failed open and the pcm is trying to warm it up by making the mixture fat.
get a good thermostat and install it.
your thermo probably failed open and the pcm is trying to warm it up by making the mixture fat.
get a good thermostat and install it.
12-22-2013, 09:34 PM
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Year: 1994 1993
Model: Cherokee
Engine: 4.0
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