Cam Angle Sensor Test

Posted by mharrison, Sep 30, 2007
420A Bolt-on Tech - Intake, exhaust, ignition, fuel system, cooling, etc - specific to 2G N/T DSMs. New Members must limit their 420A tech posts to this forum.

  1. mharrison

    mharrison Proven Member

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    The above is from another thread. When I unplug my Cam Angle Sensor, the car just dies immediately. Does this mean it's bad? Or is the above test not valid?
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  2. absolute_DSM

    absolute_DSM Proven Member

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    I dont know what that guy is talking about.

    Your CAS controls your spark. No CAS, no spark.

    Are you thinking your CAS is bad? If so, do a simple CAS test.

    Unbolt the CAS from the head.
    Pull all your spark plugs.
    Turn the key to the ON position (engine NOT running).
    Spin the CAS to verify all your spark plugs spark.
    #2
    Locke likes this.
  3. mharrison

    mharrison Proven Member

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    Well, I have an intermittent miss. It tends to miss under idle (most of the time) and occasionally under acceleration. Also throws a P0302 code.

    Coil Good, Plugs Good, Wires Good, Injectors Good, trying to find the problem.
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  4. absolute_DSM

    absolute_DSM Proven Member

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    How do you know they are all good?

    Did you test the coils? Plugs are NGKs? Grounds are good? Injectors are cleaned?
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  5. mharrison

    mharrison Proven Member

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    I appreciate the input. Here are the responses:

    Replaced the coil with a brand new one. No Change. (I had access to one at no charge!)

    Plugs are NGK's. All plugs work in all cylinders except #2. Verified this by swapping them around. They all still generate a misfire in cylinder #2 according to the computer codes.

    What grounds?

    #2 Injector has been replaced, others indicate no signs of being problematic. Can hear the electromagnet in all coils firing.

    Compression is good on all 4 cylinders.
    Timing is good.
    Car was running like a top with a new timing belt, new water pump, and rebuilt head for about 5k miles before this misfire occurred.
    Throttle body has been cleaned.
    EGR valve has been tested.
    #5
  6. Locke

    Locke N/T DSM Wiseman

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    Don't put all of your faith in the ECU's determination of specific cylinder misfire.

    Try checking the connections at the knock and crank sensors, and that the magnet in the cam sensor is not cracked.
    #6
  7. laserspeeddemon

    laserspeeddemon Proven Member

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    What year and model car are we referring to?
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  8. mharrison

    mharrison Proven Member

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    97 Mitsubishi Eclipse GS.
    420A Engine.
    5 speed Manual Transmission.
    No Mods.
    #8

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