00 deville P0300
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Northstar Engines and System Technical Discussion Discussion, 00 deville P0300 in Cadillac Engine Technical Discussion; so my deville with 70k starts acting up on drive home from work Saturday. Its running pretty damn rough and ...
  1. #1
    79lac is offline Cadillac Owners Member
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    00 deville P0300

    so my deville with 70k starts acting up on drive home from work Saturday. Its running pretty damn rough and seems to only smooth out while doing 60mph. where should i start? i checked front plugs (replaced all about 20k ago), all sensors, egr, etc. should i pull off the injectors one by one?

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  3. #2
    Zorb750 is offline Cadillac Owners Connoisseur
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    Re: 00 deville P0300

    Did you replace your wires too? What year Deville? Could be crank position sensor, oxygen sensor, MAF, EGR. If it is that rough, you will get a Service Engine light soon. Read the code.

  4. #3
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: 00 deville P0300

    No wires on the 2000. It has COP ignition.

  5. #4
    79lac is offline Cadillac Owners Member
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    Re: 00 deville P0300

    yeah i am at a loss with this car. its one thing after another.

  6. #5
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: 00 deville P0300

    Injectors are the last thing I would suspect. I'd concentrate on the plugs, coils and ICM connectors.

  7. #6
    79lac is offline Cadillac Owners Member
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    Re: 00 deville P0300

    front coil it is! thanks for the help

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