1997 STS - hard start, backfire when cranking
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Northstar Engines and System Technical Discussion Discussion, 1997 STS - hard start, backfire when cranking in Cadillac Engine Technical Discussion; My 1997 sts with a northstar won't start. It turns over and backfires thru the manifold....
  1. #1
    RayLantrip is offline Cadillac Owners Member
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    1997 STS - hard start, backfire when cranking

    My 1997 sts with a northstar won't start. It turns over and backfires thru the manifold.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, install a sound system
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    Re: 1997 STS - hard start, backfire when cranking

    Welcome Aboard !!!! Go up a thread or two and study the proper car/year/system parts in the sticky post "How to pull codes". That gives you the advice on how to retrieve any stored codes from the car's built-in scanner/reader. Practice, write down any found codes and whether each is Current or History. Go back to the sticky and open the link with "obd2" in the address to get to a Master Index of all codes. Decipher the codes, write it all down and post it here.

    Has anyone recently messed with the spark plug wires and/or coils ?? How old are they ? Are the plug wires connected to the correct coil terminals ?

  4. #3
    RayLantrip is offline Cadillac Owners Member
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    Re: 1997 STS - hard start, backfire when cranking

    All the plugs were replaced when we replaced the head gasket. Also the security light won't turn off when the key is in. I'm not sure how to get it to go off or if it may be the problem.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1997 STS - hard start, backfire when cranking

    Check for a leaky FPR.

  6. #5
    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
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    Re: 1997 STS - hard start, backfire when cranking

    Quote Originally Posted by Ranger View Post
    Check for a leaky FPR.
    This

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