hello, I have a 95 GC with a 318 ci. It fails emissions because it wont get hot enough. The hottest it runs is about 175. I just replaced the thermostat with a stock 195 degree, replaced the coolant tempeture sensor and air intake tempeture sensor and it still doesnt heat up. Anyone have any ideas? I need to get this fixed, i only have about 2 more weeks before its due in the emissions place again, and with it running cool it will fail. Thanks.
Jeep Jedi Master
Mine runs hotter than that. I'll have to search around for an answer.
04 4.7 HO, limited
08 Z71 Suburban, front leveling kit with rear spacers. 285/65 18s Nitto TerraGrappler G2s
94 5.9 Laredo 6.5 RE lift with 35 Maxxis Bighorns
and 33 Bridgestone Duelers
Detroit and true trac
Red Jeep Club Member
Texas Jeep Owner #6
USN Jeep Club #4
For your performance needs:
Originally Posted by greenmachine99
Black 1996 5.2L ZJ Limited
Running rich would cause you to run cool as well. If the O2's are getting old they will cause your Jeep to run a little on the rich side. Running lean will cause more heat. How does your MPG look?
The tick-mark just before 210 °F = 182.5 °F. Your temperature dial should in-between these two. Mine never is. It’s always at 182.5 °F with a 195 °F thermostat. But that’s not important. What is important is that the CTS sends the correct information to the PCM. Since you just replaced your CTS, I would suspect that it is sending the correct information. I would not trust the read out of the dashboard display to be very precise. If you curious enough, you can check the resistance of the CTS at different temperatures using a pot of water on a stove with a thermometer. There are values for resistance vs temperature, listed in the Haynes manual. The best part about this test is it’s free. If you know how to plot graphs in Excel, then it does not matter what temperatures you choose. Simply plot your measured values and then co-plot the values listed in the Haynes manual. You will see if they are close or not. I would start if checking O2 sensor first.
94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new
88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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