2004 Deville very rough idle in morning - Page 2
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2004 Deville very rough idle in morning in Past Cadillac Vehicle Discussion; replaced the hose and started the car up and the service engine soon light was still on. it's idleing way ...
  1. #16
    bluesteve1 is offline Cadillac Owners Member
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    Re: 2004 Deville very rough idle in moring

    replaced the hose and started the car up and the service engine soon light was still on. it's idleing way better but still a little rough. drove it around the block a few times then the service engine soon light started blinking. I changed out the front 4 spark plugs before I fixed the hose. Hopfully when I change the back ones out it will fix the problem.

  2. #17
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: 2004 Deville very rough idle in moring

    A steady SES light means "Misfire detected". A blinking SES means "Severe misfire detected".

    Something is wrong. What plugs did you use ? Are/were the connector boots clean and not carbon tracked ?

  3. #18
    bluesteve1 is offline Cadillac Owners Member
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    Re: 2004 Deville very rough idle in moring

    I used AC Delcos and yes the boot appeared to be clean. Do you think the blinking light is being caused by the 4 new plugs I put in? I drove it to an AutoZone before it started blinking (when it was just steady) to get the codes ran and it pulled up 2 codes. I’m at work and can’t remember what they were off the top of my head. The guy there said my car was running lean and suggested the codes were being caused by either the spark plugs or fuel injectors. When I get home I’ll look at the codes and post them.

  4. #19
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    My guess would be that the 2 codes were P0171 and P0174 (both lean codes), and were being caused by the broken PCV connector.

  5. #20
    bluesteve1 is offline Cadillac Owners Member
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    Re: 2004 Deville very rough idle in moring

    Quote Originally Posted by MoistCabbage View Post
    My guess would be that the 2 codes were P0171 and P0174 (both lean codes), and were being caused by the broken PCV connector.
    would they still be showing up even after I fixed the hose? The light started blinking after the hose was fixed as well.

  6. #21
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    If the engine is no longer running lean, the codes will no longer be current, but will be stored as history codes.

    When you pull your codes, they will be followed by either a C (Current), or an H (History).

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