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Northstar Engines and System Technical Discussion Discussion, Check engine light in Cadillac Engine Discussion; 1998 Cadillac DeVille Northstar. Check engine light came on today while driving. I checked codes and came up with PO300 ...
  1. #1
    csbeard is offline Cadillac Owners Member
    Join Date
    Feb 2004
    Posts
    14

    Check engine light

    1998 Cadillac DeVille Northstar.

    Check engine light came on today while driving.
    I checked codes and came up with PO300 (Engine misfire detected)

    Before I take it to the shop, is their anything I can do.

    Like fule injection cleaner in the fule tank??

    Thanks
    CSBeard


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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    69
    Posts
    82,383

    Re: Check engine light

    Change wires and/or plugs. Stick with OEM.

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