01 Catera getting P0300 code
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Cadillac Catera and Cimarron Forum Discussion, 01 Catera getting P0300 code in Past Cadillac Vehicle Discussion; Hi, My in-laws car had a P0300 code come up (random misfire detected). Where do I start? Could it be ...
  1. #1
    retho78 is offline Cadillac Owners Enthusiast
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    01 Catera getting P0300 code

    Hi,

    My in-laws car had a P0300 code come up (random misfire detected). Where do I start? Could it be the plugs, coil pack or oil leak going into the plugs?


    Thanks.

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  3. #2
    waco-brian's Avatar
    waco-brian is offline Cadillac Owners Fanatic
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    Re: 01 Catera getting P0300 code

    is that the olny code? could be low on fuel,bad fuel, excessive vibration, bad drive belt for a/c

  4. #3
    waco-brian's Avatar
    waco-brian is offline Cadillac Owners Fanatic
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    Re: 01 Catera getting P0300 code

    i just went thou my notes i got that code on my 98 and it was the 6 plug coil pack lil diferant than the 2000

  5. #4
    retho78 is offline Cadillac Owners Enthusiast
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    Re: 01 Catera getting P0300 code

    That's the only code that showed up on my scanner. The car has new timing belt, water pump and serpentine belt. These were replaced early this year. I don't think there is any vibration, but will check and see what exactly is going on. I think it may be the valve coer gasket leaking oil and going into the plugs.

  6. #5
    retho78 is offline Cadillac Owners Enthusiast
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    Re: 01 Catera getting P0300 code

    Just an update, the check engine light randomly comes on and goes off now. I didn't do anything, recently filled up some gas and then the light went off and so far it is staying like that....weird!

  7. #6
    RippyPartsDept's Avatar
    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: 01 Catera getting P0300 code

    How many miles? when were spark plugs last changed? (or were they ever changed?)
    it's very possible that one of the ignition coil packs/modules is the cause here
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
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  8. #7
    retho78 is offline Cadillac Owners Enthusiast
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    Re: 01 Catera getting P0300 code

    The car has about 135K and the plugs were changed early last year. I'm think it could be the coil pack or the plug wires, because once I started it the other the day, the car had a slight shake and when I accelerate it, the car would run fine and then it was okay. So far it is running fine, but will keep an eye.

  9. #8
    RippyPartsDept's Avatar
    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: 01 Catera getting P0300 code

    the shake on acceleration is probably due to the misfire

    and i don't think you have wires... just a coil over plug module on each cylinder head
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
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  10. #9
    retho78 is offline Cadillac Owners Enthusiast
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    Re: 01 Catera getting P0300 code

    okay, will keep an eye and maybe replace the coil pack. How much does a coil pack cost?

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    Re: 01 Catera getting P0300 code

    ignition coils are around $135

  12. #11
    RippyPartsDept's Avatar
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    Re: 01 Catera getting P0300 code

    90584337 for even cyls
    90584336 for odd cyls

    list prices aren't exactly the same but basically $158
    i can sell them for $100
    each, of course (and before shipping)
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
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  13. #12
    Cadi Cat is offline Cadillac Owners Fanatic
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    Re: 01 Catera getting P0300 code

    Go to advance Auto parts. They have them for $96/side. It's not a gm part but personally who cares. Works the same!

  14. #13
    retho78 is offline Cadillac Owners Enthusiast
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    Re: 01 Catera getting P0300 code

    Thanks, and they have the coupon codes all the time which may drop the price even lower.

  15. #14
    retho78 is offline Cadillac Owners Enthusiast
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    Re: 01 Catera getting P0300 code

    I just checked in advanceauto.com and with the coupon code I can get it for $76 each.

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    CaddyObsessed is offline Cadillac Owners Member
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    Re: 01 Catera getting P0300 code

    Whenever I get this code, its because there is water in the sparkplug hole between the boot and the plug. It grounds out to the head giving you a random misfire. Sometimes I hose off the engine and forget to blow the water out of these areas.

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