1998 Deville - change spark plugs

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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 1998 Deville - change spark plugs in Past Cadillac Vehicle Discussion; I want to change the spark plugs and wires. I am unable to get off the plastic cover on top ...
  1. #1
    dongill is offline Cadillac Owners Member
    Join Date
    May 2006

    Smile1998 Deville - change spark plugs

    I want to change the spark plugs and wires. I am unable to get off the plastic cover on top of the engine. There are four nuts holding the cover. Two nuts rotate but do not come loose. I think the bolts are rotating. Any suggestions? I appreciate any help you can give!

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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
    Woodstock Ill.

    Re: 1998 Cadillac Deville - change spark plugs

    Keep turning and pull the studs with it. Once they are off you can remove the studs, put them back and apply some anti-seize to the threads.

  4. #3
    mavric240's Avatar
    mavric240 is offline Cadillac Owners Fanatic
    Automobile(s): 1998 Deville
    Join Date
    Mar 2014
    Dayton Ohio

    Re: 1998 Cadillac Deville - change spark plugs

    The padding under the cover can over time adhere to the plenum too so you might have to "gently tug" to get it loose.

  5. #4
    rodnok01's Avatar
    rodnok01 is offline Cadillac Owners Master
    Automobile(s): 98 DeVille, 97 DeVille d'Elegance
    Join Date
    Feb 2012
    Make sure to put ground under the ICM over back plugs when you reinstall. It geta left off a lot.

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