4.5 spark plugs
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HT4100 4.1, 4.5, 4.9 Discussion, 4.5 spark plugs in Cadillac Engine Technical Discussion; what would be the easiest way to change the back 4 spark plugs because i always have trouble and it ...
  1. #1
    snydly402 is offline Cadillac Owners Member
    Automobile(s): 1990 sedan deville
    Join Date
    Aug 2007
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    Nebraska
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    Question 4.5 spark plugs

    what would be the easiest way to change the back 4 spark plugs because i always have trouble and it pisses me off. thank you

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  3. #2
    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
    Automobile(s): 1985 Sedan DeVille
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    Southern Maryland
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    Re: 4.5 spark plugs

    disconnect the motor mounts and rotate the engine

  4. #3
    caddydaddy's Avatar
    caddydaddy is offline Cadillac Owners Connoisseur
    Automobile(s): 2005 Escalade 6.0L 2WD, 2007 Jeep Grand Cherokee Limited CRD
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    Gales Ferry, CT
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    Re: 4.5 spark plugs

    Use a combination of extensions and U-joints to get to them from above the engine. It's a real pain, but it can be done. Be sure to use platinum tipped spark plugs so you don't have to do it for another 100k miles!

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