Startup Issues
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Cadillac STS Forum - 2005 through 2012 Discussion, Startup Issues in Past Cadillac Vehicle Discussion; About 90% of the time, when I start my car in the mornings before heading to work, it will run ...
  1. #1
    maiahsdad's Avatar
    maiahsdad is offline Cadillac Owners Fanatic
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    Startup Issues

    About 90% of the time, when I start my car in the mornings before heading to work, it will run for a bout 15 seconds, and then shut down. When I restart it, I have to hold my foot on the gas because it's idling so rough that it won't continue to run. Then after about 15 seconds of that, it will smooth right out and run like butter. And will remain perfect until I shut it off for an extended amount of time.

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    BaTu is offline Cadillac Owners Enthusiast
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    Re: Startup Issues

    Take a look at the intake bolts, they often loosen and cause a lean condition (or you may have another vacuum leak elsewhere). Too Lean shows-up first during cold (extra rich) start & run conditions like you're describing...
    dkozloski and dkozloski like this.

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    EChas3's Avatar
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    Re: Startup Issues

    If you get a Check Engine light, reading that would be the obvious first step. but if not, the loose bolts mentioned above often don't set a code.

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    maiahsdad's Avatar
    maiahsdad is offline Cadillac Owners Fanatic
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    Quote Originally Posted by EChas3
    If you get a Check Engine light, reading that would be the obvious first step. but if not, the loose bolts mentioned above often don't set a code.
    A local mechanics shop said that the car had nine codes. He said that some codes cause other codes. Something about air. He says now I need to go to a dealer.

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    Re: Startup Issues

    If you have the Northstar, I second the recommendation to check the intake manifold bolts. Or, check the vacuum line that goes from the back of the intake manifold to the brake booster. I had mine come loose once, and the car idled terribly. Although in my case the tube had come off and was fixed once I put it back on.

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    maiahsdad's Avatar
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    Quote Originally Posted by orange57
    If you have the Northstar, I second the recommendation to check the intake manifold bolts. Or, check the vacuum line that goes from the back of the intake manifold to the brake booster. I had mine come loose once, and the car idled terribly. Although in my case the tube had come off and was fixed once I put it back on.
    I have the Northstar. After pulling the codes, it seems that nine triggered. But the technician indicated that sometimes some codes will trigger other codes.

    But there was indication of air problems. And they suggest I go to the dealer for that.

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    curtc's Avatar
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    Why take it to the dealer just yet?

    What were the codes?
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    Quote Originally Posted by maiahsdad View Post

    I have the Northstar. After pulling the codes, it seems that nine triggered. But the technician indicated that sometimes some codes will trigger other codes.

    But there was indication of air problems. And they suggest I go to the dealer for that.
    Ok, but before you go check the intake bolts. It is very easy to do. There are 10 to 12 going around the manifold. If any are loose, tighten them and then remove the negative from the battery to try and clear the codes. As we have been saying, loose intake bolts can cause a lot of codes. And if the first shop that looked at it wasn't knowledgeable on the STS they could easily over look it. It just may save you a trip to the dealer and a few hundred dollars.

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    Quote Originally Posted by orange57

    Ok, but before you go check the intake bolts. It is very easy to do. There are 10 to 12 going around the manifold. If any are loose, tighten them and then remove the negative from the battery to try and clear the codes. As we have been saying, loose intake bolts can cause a lot of codes. And if the first shop that looked at it wasn't knowledgeable on the STS they could easily over look it. It just may save you a trip to the dealer and a few hundred dollars.
    Are these intake bolts easy to get to? I don't own any tools here in Indiana. I would need to go and purchase what I need. Does anyone have any diagrams to show me what to do, and what to torque the bolts at?

  11. #10
    1BadCadSTS's Avatar
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    Basic hand tools especially in 1/4 will prove beneficial.

  12. #11
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    Re: Startup Issues

    A 1/4" drive ratcheting torque wrench, a 6" extension, a universal joint socket that fits the bolts, and a combination wrench are all I needed. If you take off the oil filler and power steering caps and yank off the beauty cover it's all in front of you.
    Don't mess with Binky Bear!


  13. #12
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    Re: Startup Issues

    Be careful not to over tighten. The proper torque is very light. Somebody got it handy? 12 in/pds?

  14. #13
    orange57's Avatar
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    Re: Startup Issues

    89 in-lbs for the manifold bolts.

  15. #14
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    Quote Originally Posted by orange57
    89 in-lbs for the manifold bolts.
    So we're saying to torque the bolts to 89 pounds? Not sure what the "in" represents.

  16. #15
    Ludacrisvp's Avatar
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    Re: Startup Issues

    that would be 'inch pounds' as opposed to the normal foot pounds.
    I believe people refer to this as just a bit tighter than finger tight.
    Keep in mind that the intake is plastic and over tightening will be an issue.

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