Question about 2004 Kia Optima

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My son's 2004 Kia Optima started stalling on the highway. 1st he noticed the RPMs drop then come back up. This happened several times before the car finally stalled. After a couple attempts, it restarted, then stalled again. Eventually he got it started again and he drove 60 miles without trouble until it died again. The check engine light never came on until it totally died. What items should be checked in what order? Tank was 1/2 full. Temperature has been below freezing 2 weeks. Fuel filter/pump has probably not be replaced. Crankshaft Position Sensor, Camshaft Position Sensor possible? Anything else?

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Start with the simple and replace the fuel filter. The fuel filter should be replaced every 15,000 miles or once a year to ensure the fuel system is running 100%. Auto Zone will have the fuel filter and can give you the step by step instructions to getting the job done with common tools. If it's the fuel pump failure, you have not gotten the car restarted. Good luck and keep me posted, be glad to know you got your car running 100% again soon and please rate.

Posted on Jan 11, 2010

  • Harvey N Tawatao
    Harvey N Tawatao Aug 09, 2010

    Nope, fuel pump or dirty fuel filter will not throw a check engine light till the engine stops running. Good luck and keep us posted on your KIA, and did you have the car scanned for any DTC codes.

    Post back if you have and thank you once again for using FIxya


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My 2004 Kia Optima was running fine, went home for lunch one day and went back out to go back to work, it started but it wouldn't stay running. Put a Cam Shaft Sensor on and it runs good except the check engine light is on and the RPM hand has quit working, feels like it is misfiring some. Any Suggenstions?

Posted on Aug 09, 2010

  • sexylovely Dec 16, 2010

    The oxygen sensor and crank shaft should be looked at. Most of the time if the cam shaft stops working days later you will have problems with the crankshaft, trust me im having this terrible problem as we speak. Hope this helps!

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Did you find out? my spectra stalled on me today

Posted on Feb 24, 2010

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