Car cranks but has misfire, code P0300

  • 3.5L
  • V6
  • 2WD
  • 164,000 MILES
Car shut off the other day while driving, check engine light came on blinking. Gives me a code of P0300 for misfire. I changed all spark plugs and still had a misfire. Coils are good so I changed the cam position sensor and now it won’t even start. I hear the fuel pump when I turn the key on and I am getting fuel to fuel rail. Please help!
Do you
have the same problem?
Saturday, June 15th, 2019 AT 8:38 AM

1 Reply

Welcome to 2CarPros.

When you replaced the sensor, did you use the paper spacer to set it correctly? Here are directions for installing one. Make sure this is what you did. The attached pics correlate with the directions.


Camshaft Position Sensor
pic 1

The camshaft position sensor is installed in the timing belt housing cover above the left camshaft sprocket.

1. Disconnect the negative battery cable.
2 Remove the upper intake plenum.
3. Disconnect electrical connector from sensor.
4. Remove camshaft position sensor screw.
5. Pull sensor up out of the timing belt housing cover.


Paper Spacer
pic 2

If the removed sensor is reinstalled, completely remove the old spacer from the sensor face. Attach a NEW SPACER to the face of the sensor before installation. If installing a new sensor confirm that the paper spacer is attached to the face.

1. Install sensor in the timing belt housing and push sensor down until contact is made with the camshaft sprocket. While holding the sensor in this position, install and tighten the retaining bolt to 12 N.m (105 in. lbs.) torque.
2. Attach electrical connector to sensor.
3. Install the upper intake plenum.
4. Connect the negative battery cable.


If you followed that correctly, take a look through this link to see if anything helps.

Also, check to make sure you have spark to the plugs, an injector pulse, and proper fuel pressure.


I'm not sure what prompted you to replace the cam sensor, so let me know that. Also, keep in mind that an engine vacuum leak can cause a random misfire, too.

Let me know if any of this helps or if you have other questions.


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Saturday, June 15th, 2019 AT 7:04 PM

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