Question about Kia Optima

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The problem started with the gas cap. The engine would not go above 1200 rpm until you shut off the car tightened the cap and then would be fine, although the check engine light would stay on for a short time after tightening the cap. Then it started being more often. I replaced the gas cap and it ran fine (with no check engine) for about a week. Then the same symptoms returned only worse. The check engine does not go off, the car noticably misses at times and the stops to tighten the gas cap have been getting more and more frequent.

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Have the fuel pressure checked,if it is not in specs ,replace it,it is on passengers side ,flip back seat forward and pull back the carpet there is a access to the fuel pump there if you need to replace it,it has a check valve under the car inside of the right rear tire,that give problems also,but it sounds like the fuel pump,it is easy to change,you can change it your self.I hope this was helpful,getting the engine code will help too.Auto zone can run the codes for you,if it has a lean o2 sensor reading then replace the fuel pump.

Posted on Jul 31, 2010

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