Po320 code (crank sensor?) 2004 lincoln navigator also comes up with code po303. when going up hills it tends to miss. I replaced fuel pump and fuel filleter thinking that was the issue. It did make the car run better but it still misses up hills. Please help.
Replaced a camshaft sensor still running rough & engine light still on, 2004 lincoln nav. 5.4 liter
Replace the O2 Sensor and look at replacing the wires and Plugs. The engine seems to idle fine but hesitates and sputters under a load. Those are all Ignition system symptoms. The O2 Sensor would not normally be my first area of concern in a vehicle but you are right on the line as far as needing a replacement. Replace the Spark plugs and wires even if you aren't at that point in mileage and consider replacing the O2 sensor. It may very well be a crankcase sensor or Crank Position sensor but those should be under warranty unless the vehicle has 150000 miles on it. They rarely go out this early in the life span of the vehicle unless it has been abused.
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You can use an Ohm Meter to test the plug wires but you would have to get the repair manual on your vehicle to see what resistance they should have. The repair manual will also tell you exactly what those codes stand for. The code reader most Auto Zone stores use will identify what the code is for as well. I am diagnosing based on the symptoms you presented in the description. If you haven't replaced your wires or plugs in the last 50k miles I would do so. If that code P320 is the crank position Sensor it is possible for it to show faulty if the vehicle is missing which will present you with a false code. A Haynes manual will take you through verifying the problem and doing the repair and is available at Auto Zone or your local auto parts store.
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is there a way to test these before i go replacing a million parts.
Thank you for that. I just know that it was running really bad before we change the fuel filter and fuel pump. Because before those changes no engine light came on. Once the fuel pump was changed the light came on and then it only missed going up hills. Before the fuel pump was replaced i would start it and then some times it just killed over or miss while sitting still. Then it would also have missing issues like crazy and so maybe it was good deal to change the fuel pump? Also before i replaced the fuel pump it would sit all day at work and then i would start it up and it would rumble a little and then going up hills it sounds like a rattle in a can when hitting speeds of 45-60 up hills (when it would do that i could romp on it and it would go away). So all it took was for 3 weeks ago it got rainy and then all the missing and killing over started. So today i found someone to read me the codes and it pulled up the two codes. last week i took it to a shop and they put it on a computer and wont tell me the codes. Why pay when your no going to give me the codes. I have a warrenty and the car hit 65505 3 weeks ago and now sits in the driveway until i find a way to tell.
All problem was fixed. It was just #3 spark plug and coil that was replaced and now its running fine.
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