Question about 1998 Lincoln Town Car

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Check Engine Light is on and the code is P0303

Upon returning from an 8 hour trip, when I exited the expressway and slowed to a sprre of lass than 50 mph. my check engine light came on. I purchased a Actron CP9180 AutoScanner to help me in understanding the problem. I read the code which was P0303, Mod $10 Cylindar 3 Misfire Detected. It also provided the following:

Global OBDII, Non OBD State OBD Check
Mil Status: ON
Codes Found: 1
Monitors OK: 3
Monitors Inc: 5
Monitors N/A: 3

I need help with what does these code mean as to what is wrong with this vehicle. The car is a 1998 Lincoln Town Car.

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The car has mis fired with mean an injector has gone bad or it needs spark pluges and wires i bet it needs the plugs but it could also be both replace the plugs and wires then go from there

Posted on Dec 10, 2008

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Code P0303 means that there is a misfire detected on cylinder #3. This could becaused by anything from a worn out spark plug to a blown cylinder head gasket, a faulty fuel injector, a bad ignition coil, or a leaking intake manifold gasket. I have also seen this type of code caused by clogged-up EGR ports in the intake manifold on certain engines. "Freeze Frame Data" stored in your Engine computer along with the fault code is designed to help identify what engine conditions (high speed/slow speed, heavy load/light load, etc.) are producing the misfire. This helps a lot in identifying exactly what is causing the cylinder to misfire.

One way to eliminate some of the possible causes is to swap parts with another cylinder to see if the code changes.

If you have "Coil-On-Plug" ignition, you can swap the coil on #3 cylinder with the coil on #4 Cylinder and swap the #3 spark plug with the #2 spark plug. Then clear the codes and drive the car till the Check Engine (or Service Engine Soon) light comes back on.

If it still gives you P0303, then it is not being caused by the plug or the coil. It could be any of the other possible causes listed above.
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swiching cylinder 1 to 3 fuel injector and coil. but they still have engine code

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