2002 caddy deville
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Northstar Engines and System Technical Discussion Discussion, 2002 caddy deville in Cadillac Engine Technical Discussion; i have a 2002 cadillac deville and for a while now i have been having a bad rough idle and ...
  1. #1
    drapedupDTS is offline Cadillac Owners Member
    Automobile(s): Cadillac
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    2002 caddy deville

    i have a 2002 cadillac deville and for a while now i have been having a bad rough idle and the acceleration is less than perfect.... short and sweet my question is that what is the economical way to test the issue accurately and a good online store to buy the coil packs if needed... Thanks

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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)
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    Re: 2002 caddy deville

    Before you buy anything do a search for plenum and check that. While you're there, clean the TB.

  4. #3
    Mark C's Avatar
    Mark C is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Seville STS, 2000 Seville STS
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    Re: 2002 caddy deville

    If you had a bad coil pack chances are you would have an SES light on and a P0300 misfire code in your current DTCs. Pull your DTCs to find out what the car thinks is the issue. P0300 by itself, probably a coil pack, or plugs or plug boots, P0171 or 0174 with or without a P0300 means vacuum leak and probably a split plenum boot.

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