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Unread 03-31-2004, 01:07 PM   #1
greenmachine99
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1999 TJ Wrangler 
 
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cooling issues

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.

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Unread 03-31-2004, 01:17 PM   #2
Texas ZJ1
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Mine runs hotter than that. I'll have to search around for an answer.


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Unread 03-31-2004, 03:10 PM   #3
Meerkat
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Hotter spark plugs
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Unread 04-01-2004, 07:06 PM   #4
greenmachine99
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yea, i know, its supposed to run @195. any ideas?
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Unread 04-02-2004, 06:30 AM   #5
Meerkat
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Quote:
Originally Posted by greenmachine99
yea, i know, its supposed to run @195. any ideas?
Seriously, have you tried hotter spark plugs? They will burn more of the fuel, and lower your emissions, perhaps enough to pass.
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Unread 04-02-2004, 07:45 AM   #6
97RedBird
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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?
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Unread 04-02-2004, 01:01 PM   #7
greasefingers
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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.
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Unread 04-02-2004, 03:24 PM   #8
greenmachine99
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Its getting about 15 mpg, so i dont think its running all that rich because thats pretty average.
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