Erratic Temp Readings - Kia Forum
 
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post #1 of 4 (permalink) Old 12-09-2016, 09:03 AM Thread Starter
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Erratic Temp Readings

My 03 Optima LX with a 2.4L 123K miles has been doing some crazy readings with the temperature gage. When I first started driving the car, the gage would not budge from slightly under the midway point. Now every once in a while, it pegs all the way to the max red zone. It only does this while I'm in stop & go traffic. As soon as I get moving, the gage will drop down to normal. The fans are working and I've gotten a temp reading of 180 degrees at the radiator while the temp gage was pegged & there is no steam or other signs of overheating.

While troubleshooting, I replaced the stat with an OEM thermostat, replaced the temp sending unit, the radiator is about a year old- I can't seem to find a two core radiator, the water pump was replaced with the timing belt about 10K miles ago. I even tried a different ECU from the recycle yard.

Don't now if it's related but since all this began, I can't fill the gas tank. It takes forever to fill because the nozzle keep clicking off. At my wits end & don't know what to do next.

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post #2 of 4 (permalink) Old 01-03-2017, 12:02 PM Thread Starter
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I've found an exhaust leak and am in the process of fixing the leak to see if that takes care of the erratic temperature readings. I guess the exhaust leak can make the engine run lean causing it to run hotter than normal. I will update as soon as it's been repaired & verified. Still need to get the fuel filling situation taken care of.
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post #3 of 4 (permalink) Old 01-05-2017, 04:00 PM
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Quote:
Originally Posted by Largop View Post
My 03 Optima LX with a 2.4L 123K miles has been doing some crazy readings with the temperature gage. When I first started driving the car, the gage would not budge from slightly under the midway point. Now every once in a while, it pegs all the way to the max red zone. It only does this while I'm in stop & go traffic. As soon as I get moving, the gage will drop down to normal. The fans are working and I've gotten a temp reading of 180 degrees at the radiator while the temp gage was pegged & there is no steam or other signs of overheating.

While troubleshooting, I replaced the stat with an OEM thermostat, replaced the temp sending unit, the radiator is about a year old- I can't seem to find a two core radiator, the water pump was replaced with the timing belt about 10K miles ago. I even tried a different ECU from the recycle yard.

Don't now if it's related but since all this began, I can't fill the gas tank. It takes forever to fill because the nozzle keep clicking off. At my wits end & don't know what to do next.
Change your gas tank filter it is near the fill pipe in the rear wheel opening that will stop the gas tank filling problem.

You believe your high temp reading is real or is a faulty gauge?
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post #4 of 4 (permalink) Old 01-05-2017, 04:03 PM
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Originally Posted by Largop View Post
I've found an exhaust leak and am in the process of fixing the leak to see if that takes care of the erratic temperature readings. I guess the exhaust leak can make the engine run lean causing it to run hotter than normal. I will update as soon as it's been repaired & verified. Still need to get the fuel filling situation taken care of.
Exhaust leaks that let in O2 to the exhaust upstream of the O2 sensor usually cause the car to go rich as the O2 sensor signals the ecu that a lean mixture is present due to excess O2 and the ECU increases fuel flow in response.
Rich mixtures usually make a engine run cooler.
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