Question about 1999 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. Service Engine Soon light came on, Checked the code and got a P0301(Misfire cylinder 1) so I swapped the coil with cylinder 2 and cleared the check engine code. I then drove the car again until it came back on and I got a P0302 (misfire cylinder 2) So that tells me that the Coil is bad. I replaced the coil and boot plug and all the spark plugs but I am still having a misfire. I would assume it was a fuel injector but why would it change from cylinder one to cylinder two misfire when I move the coil?

Can anyone help?

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  • gerry bissi May 11, 2010

    is it misfiring for sure? Sometimes the check engine light comes on after a long drive and after a few regular rive cycles it goes away.

    Did you replace the plug wire to that cylinder?





    Misfire Detection Monitor
    The Misfire Detection Monitor is an on-board strategy designed to monitor engine misfire and identify the specific cylinder in which the misfire has occurred. Misfire is defined as lack of combustion in a cylinder due to absence of spark, poor fuel metering, poor compression, or any other cause. The Misfire Detection Monitor will be enabled only when certain base engine conditions are first satisfied. Input from the ECT, MAF and CKP sensors is required to enable the monitor. The Misfire Detection Monitor is also performed during on demand self-test.


    1. The PCM synchronized ignition spark is based on information received from the CKP sensor. The CKP signal generated is also the main input used in determining cylinder misfire.


    1. The input signal generated by the CKP sensor is derived by sensing the passage of teeth from the crankshaft position wheel mounted on the end of the crankshaft.


    1. The input signal to the PCM is then used to calculate the time between CKP edges and also crankshaft rotational velocity and acceleration. By comparing the accelerations of each cylinder event, the power loss of each cylinder is determined. When the power loss of a particular cylinder is sufficiently less than a calibrated value and other criteria is met, then the suspect cylinder is determined to have misfired.


    1. Misfire type A:

      Upon detection of a Misfire type A (200 revolutions) which would cause catalyst damage, the MIL will blink once per second during the actual misfire, and a DTC will be stored.

      Misfire type B:

      Upon detection of a Misfire type B (1000 revolutions) which will exceed the emissions threshold or cause a vehicle to fail an inspection and maintenance tailpipe emissions test, the MIL will illuminate and a DTC will be stored.

      The DTC associated with multiple cylinder misfire for a Type A or Type B misfire is DTC P0300.

      The DTCs associated with an individual cylinder misfire for a Type A or Type B misfire are DTCs P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0309 and P0310.

    -------------------------------------------

  • warlock61
    warlock61 May 11, 2010

    is it still the same cyl misfiring?

  • MARK CHAMBERS Jun 07, 2012

    Check Coil Pack on Caddy

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Hello I need a help.
I have 1999 lincoln town car 4.6L V8.They have check engine light on. P 0303 cylinder 3 missfire.
I was changed spark plugs,fuel filter. check compression test 150psi. fuel pressuer 50.
swiching cylinder 1 to 3 fuel injector and coil. but they still have engine code

Posted on Apr 12, 2009

  • steve Feb 16, 2014

    make sure you have the code[s] cleared . then drive and let me know what it is doing

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Chances are it is your Coil Pack on the Caddy

Posted on Jun 07, 2012

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SOURCE: Check Engine Light is on and the code is P0303

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.

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