Question about 2001 Kia Optima

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I think our 2001 Kia Optima has the same problem as the guy who's Kia shifts down to 2nd. Where can I find a repair book for a 2001 Kia so I know where the speed sensors are located? Our check engine light is on and the code reads PO300 which is multiple cylinder misfire detected. Does this have anything to do with the loss of power after we drive about 25 miles? Feels like it down shifts and then it dies. We can restart it after 10 minutes and drive another 20 miles or so before it does it again. Please, can you help?

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Seems you have 'MULTIPLE' possible causes for this problem. First of all, I'd have a mechanic (a smart one) check the Throttle Position Sensor (TPS) first, Usually, the TPS does have a direct effect on trans shifting erratically. It's also used by the ECM (Engine Control Module) to calculate 'LOAD' and subsequently the Fuel Mapping (fuel to air ratio, ignition timing, etc) which could possibly create a RANDOM MISFIRE condition. This other description you have regarding 10 minutes - that one's wierd - could be a multitude of possible causes (i.e, fuel pressure not enough or too much, malfunction in the Engine Coolant Temperature (ECT) sensor, malfunction in the Intake Air Temperature (IAT) sensor. First things first - get the TPS checked - if found bad - replace it. Go from there.

Posted on Jun 20, 2009

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