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2004 Kia Optima
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Discussion Starter #1
Well the title and description tells it all.. took the optima in today to get looked at. Saturday I was leaving work when I was HIT with the CEL (Check Engine Light). So I went to Advance Auto to see what code would pop up... get this..

The THIRD CYLINDER IS MISFIRING!!! (CODE: P0303) *Go here to find out what the code means...

GREAT!!! I don't have time for this! BUT since I had a day off today, I took it in. I was told by the service guy that it's covered under warrentee, so that's kool...
either KIA or Enterprise (Where I purchased a 4 YEAR back-up package, which covers the engine and tranny! Grr.. we'll see what's going on when I get a call tomorrow (Hopefully!)

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*Here's the information that I've found on the code P0303:

P0303 Code - Cylinder #3 Misfire
Technical Description

Cylinder #3 Misfire Detected
What does that mean?

A P0303 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #3.
Symptoms
Symptoms may include:

* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes

A code P0303 may mean that one or more of the following has happened:

* Faulty spark plug or wire
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
* Running out of fuel
* Poor compression
* Defective computer

Possible Solutions

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
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2004 Kia Optima
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Discussion Starter #4
OK, so I got a call to pick up the car this evening (around 5PM) and I get there to be told that the problem was the SPARK PLUGS that I've installed. The FMS could was not programmed for the new sparkplugs. NEWayz, they're out and the OPTIMA is running like usual.. smooth! Man, what can I say.. I'm sorry guys for telling about the spark plugs.. you can still get them, BUT make sure that the FMS is tuned to take the MORE spark that it provides. NEWayz, I'll be calling the company up since the box DID NOT state that I would have to tune the car before installing the plugs. IT was the plugs fault for the issue so they should be held responsible. Well enough babble.. just wanted to let you guys know. Hope it helps! :57:
 

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I am looking for instructions on how to replace my spark plugs and where can I find a repair manual. Can anyone help. :huh:
 

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2004 Kia Optima
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Discussion Starter #11
Originally posted by tricky455@Nov 7 2005, 08:23 PM
I am looking for instructions on how to replace my spark plugs and where can I find a repair manual. Can anyone help. :huh:
Please check your original thread that you've created for an answer.. thanks! :57:
 
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