Question about 2003 Kia Sorento

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(P0303) misfire on #3 . replaced the spark plugs and cables.. rough idle continues and the check engine light remains illuminated.. I just purchased a new coil pack, will install once it arrives. please help, with a solution..

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A misfire is not always caused by a bad plug or wire, although that is always the first place to look. I have found that this code is set by a faulty Defective Crankshaft and/or Camshaft Sensor more times than not. If the ciol ack does not solve your problem, then the sensors is where I would target next. But i am just going to say that I doubt that the coil pack will be your problem Common Problems That Trigger the P0303
Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable) Incorrect ignition timing Vacuum leak(s) Low or weak fuel pressure Improperly functioning EGR system Defective Mass Air Flow Sensor Defective Crankshaft and/or Camshaft Sensor Defective Throttle Position Sensor Mechanical engine problems (i.e.-low compression, leaking head gasket(s), or valve problems

Posted on Sep 16, 2010

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Will the heads have to be pulled in order to check so see if it is a valve that is causing low compression? How long can you drive on a p0303 ?


Low compression does not require head removal. Do a compression test on a cylinder, then squirt some oil in the spark plug hole. Do the compression test on that cylinder again. If the compression goes up then the rings are worn. P0303 is a misfire in cylinder 3. This lets unburnt gas into the catalytic convertor. The cat can overheat, melt and be ruined. If the check engine light is blinking don't drive the car. A misfire is either no gas, no spark or low compression. The quivering light can be from idle or failing alternator. Put the probs of a multimeter on the battery posts. Set the meter to volts dc. Start the car the voltage should be between 13 and 14.6 volts. Anything more or less points to an alternator problem.

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Consider replacing the Cylinder 3 Spark Plug. If that does not settle it,replace the wires too.

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Thats the list of things to check.
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There is also TSB about #3 injector needing added heat protection. This could definitely be the cause. I start at plugs and go from there.
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