1994 Deville con

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Northstar Engines and System Technical Discussion Discussion, 1994 Deville con in Cadillac Engine Discussion; I have a 1994 deville concourse - It runs rough. I replaced the MAP sensor and replaced the spark plugs. ...
  1. #1
    Dave34698 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Jun 2008

    1994 Deville con

    I have a 1994 deville concourse - It runs rough.
    I replaced the MAP sensor and replaced the spark plugs.
    The converter has been beat out by previous owner.
    When I pull the 4&6 plug wire it does change how it runs.
    No codes
    So how do I check if this is a coil pack & Spark, or fuel injector?

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  3. #2
    chubbyranger is offline Cadillac Owners Connoisseur
    Automobile(s): 99 Seville STS, 08 STS4 N* 1SG F55
    Join Date
    Apr 2007
    The Ocean State

    Re: 1994 Deville con

    if 4 and 6 are both on the same coil pack that might be a hint. does it run better or worse with those plugs pulled?

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS - 65500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: 1994 Deville con

    Make sure your plug wires are connected like this: (click and scroll in). (Northstar only....)

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