Question about 2004 Kia Optima
I have been driving a 2004 Kia Optima 6 cylinder (I think it is LX? it does not have all options). At one time the engine light was popping on; I realized it was always after I put gas in the tank. One of the guys a work told me that the gas knob might not be on tight enough. So I tried that and the light went off until this past Sunday. Now as I drive the engine does sound rougher and although what I am about to state next is nothing new I am thinking I might have a problem. For lack of a better word my car surges (like I am pushing the gas) when my foot is on the brake at a stop. Anything I should be immediately concerned about?
Really need some assistance because money is tight and I can not afford any car problems.
After some deep diagnosis with my Scan-tool, I have fixed the issue. Of all things, it was the Coolant Temperature Sensor. I was getting a PO118 code, so I looked up the sensor, graphed it with the scanner and saw that the sensor was flaking out. It would read an avg. temp. of 190 degrees, then all of the sudden drop to -40 degrees. This sensor adjusts the fuel/air ratio, thus explains my idle speed troubles. Basically, the sensor was giving too much fuel or "flooding" the engine. I have been driving for 3-4 days now and have had 0 problems since the replacement. BTW, the sensor is located by the thermostat and can be removed with an 11/16" deep-well socket. I bought the sensor for $15 at O'Reilly Auto parts. Anyway, hope this helps someone.
Posted on Jan 31, 2009
This could be anything from spark plugs needing change to bad coil pack, Poor connection in plug boot (should be spring with resistor in middle these break or wear after use.) Best bet plug into obdII code reader and then check plugs. OHM the coils for 12V. If you have power supply apply 3 volts to coils and test for output ..
Refer to www.kiatechinfo.com for more information.
Posted on Jan 19, 2009
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Posted on Jan 02, 2017
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