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Thread: misfire and crankshaft error codes

  1. #1
    Regular Member shadow.warrior's Avatar
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    Default misfire and crankshaft error codes

    hey guys.
    i need the aid of your expertise.

    i drive a manual 3.2 ltr 2004 vectra. even though a service is not due, i have had the little wrench up on the dash for about a month now. So i decided to check the error codes and i got the following:

    P0336 Crankshaft Position Sensor A Circuit Range/Performance
    P0300 Random/Multiple Cylinder Misfire Detected
    P0303 Cylinder 3 Misfire Detected
    P0305 Cylinder 5 Misfire Detected


    the car runs fine, and its definitely got plenty of power. i didnt even notice the misfire.

    also, the car has issues starting when its cold. it will crank but will not fire up very easily, and often will run really rough until i rev it a little. when its warm its fine. its been like this since i got it 1 year ago.

    i have done some research and it looks like these issues may be related.
    can anyone confirm that a faulty crank sensor would cause it to misfire?
    or should i look elsewhere for the cause?
    does this error mean i should change the crankshaft sensor? surely if it was needing replacement i would get the error:
    P0335 Crankshaft Position Sensor A Circuit Malfunction.

    i will be checking and possibly changing the spark plugs on the weekend.

    thanks

  2. #2
    Regular Member LADmachining's Avatar
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    The ECU uses the crank sensor for timing of all engine functions such as injection and ignition. It also moitors the signal from the sensor for minor variations in engine speed that would be attributable to a misfire.

    A problem with the sensor may be fooling the ECU into thinking that there is a misfire. A possibility is the shielding on the crank sesnor wiring breaking down and allowing interference to affect the cranks sensor signal.

    You would be more likely to see the PO335 code if the sensor had gone open/short circuit or was failing to provide a signal to the ECU at all.

    If you only had the misfire codes, I would suggest replacing the plugs or ignition coil pack(s). In your case I would initially suspect the crank sensor itself.

  3. #3
    Regular Member shadow.warrior's Avatar
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    thanks so much LADmachining. what you said makes loads of sense.

    now, one more question: where abouts can i find the crank sensor? and, is it as easy to replace as it was on the vectra b?

  4. #4
    Regular Member DaveW555's Avatar
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    Its on the front of the block on the flywheel side, you'll probably have to get at it from underneath tho.

  5. #5
    Regular Member shadow.warrior's Avatar
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    thanks dave. when you say the front, do you mean the side facing the front of the car? or the side where the timing belt is?
    Last edited by shadow.warrior; 16th July 2010 at 14:22. Reason: had a few winter ales

  6. #6
    Regular Member DaveW555's Avatar
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    front of the car bud

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    Regular Member shadow.warrior's Avatar
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    for anyone looking for this in the future. its right under the oil filter. you cant miss it.

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