code 0300 1999 Deville
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, code 0300 1999 Deville in Past Cadillac Vehicle Discussion; check my ignition coil all 4 read 6.0 is that normal. yes new plugs, wire etc throttle body clean as ...
  1. #1
    King Tom is offline Cadillac Owners Member
    Automobile(s): 1999 Cadillac Deville
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    code 0300 1999 Deville

    check my ignition coil all 4 read 6.0 is that normal. yes new plugs, wire etc throttle body clean as a baby a.. ac parts nothing else. still a misfire detected.

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    basscatt's Avatar
    basscatt is online now Cadillac Owners 10000+ Posts
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    Re: code 0300 1999 Deville 4.6

    Quote Originally Posted by King Tom View Post
    check my ignition coil all 4 read 6.0 is that normal. yes new plugs, wire etc throttle body clean as a baby a.. ac parts nothing else. still a misfire detected.
    ---------------------------
    P0300 is a generic misfire code -
    our on-board code readers will not display WHICH cylinder/cylinders is/are misfiring -
    only that there IS a misfire -

    take the car to any large auto parts store - they will check your codes for free -

    P0301 is a misfire in cylinder #1 - P0302 is cylinder #2 - P0303 is #3 - etc -

    once you discover WHICH cylinder is misfiring - diagnosis becomes much easier -

  4. #3
    King Tom is offline Cadillac Owners Member
    Automobile(s): 1999 Cadillac Deville
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    Re: code 0300 1999 Deville 4.6

    I have coder I will go check.

    ----------

    nothing wit on board computer or my ob reader . started engine and waited and no codes.I still have a rough idle stalling like.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: code 0300 1999 Deville 4.6

    Sounds like the only thing left is a coil. Swap them out one at a time with a known good one and see if the misfire goes away. Note the condition of the contacts when you do.

    P.S.
    This misfire isn't only briefly on a cold start is it?

  6. #5
    deville905's Avatar
    deville905 is offline Cadillac Owners Member
    Automobile(s): 2005 Deville,1999 Eldorado
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    Re: code 0300 1999 Deville 4.6

    I tried swapping the coils out and it made no change in the engine. I was getting a code 0300 (MISFIRE) to it to a local shop and he puled code 0301. Number 1 piston.....I got a good lick on line with a set of coils ACDELCO for 125 off AMAZON. Check for a vacuum leak. check intake cover where starter sits.....

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