1998 STS : Code v
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Northstar Engines and System Technical Discussion Discussion, 1998 STS : Code v in Cadillac Engine Technical Discussion; My 1998 STS runs fine, while at idle for a long time the check engine light comes on, I pulled ...
  1. #1
    jevanof's Avatar
    jevanof is offline Cadillac Owners Fanatic
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    1998 STS : Code v

    My 1998 STS runs fine, while at idle for a long time the check engine light comes on, I pulled the codes and got P0300. I does not ever seem to idle ruff.

    just some history, I changed the Head Gasket last year. and I replaced the spark plugs and hoses, I did not change the coil packs and think that might be next.

    Any Ideas?

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1998 STS : Code v

    Did you change the plug wires? If not, that's what I'd change next (A/C Delco).

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    jevanof's Avatar
    jevanof is offline Cadillac Owners Fanatic
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    Re: 1998 STS : Code v

    i will do that today,

    is there a way to test the coil pack? they cost $100 and dont want to spend that unless I have to

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 1998 STS : Code v

    You can pull the coils and look for signs of arcing at the plugs or listen to them with a rubber hose for arcing. I think you can test the resistance, but I'm not sure what it should be.

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