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Cadillac STS Forum - 2005 through 2012 Discussion, Intake Manifold Bolts in Past Cadillac Vehicle Discussion; Originally Posted by Lifer Its only been a few days, but I have had a noticeable improvement in gas mileage. ...
  1. #61
    Lifer's Avatar
    Lifer is offline Cadillac Owners Enthusiast
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    Re: Intake Manifold Bolts

    Quote Originally Posted by Lifer View Post
    Its only been a few days, but I have had a noticeable improvement in gas mileage. It was around 13.5 average for city - suburb driving, but now I am around 19.5. Next would be a road trip. My last on in August averaged 21 miles to the gallon.
    I checked mine yesterday. Two were loose again. Only 3,000 miles. Seems to be a continuing issue.

  2. #62
    EChas3's Avatar
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    Re: Intake Manifold Bolts

    Loctite Purple?

  3. #63
    aliskerov is offline Cadillac Owners Fanatic
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    Re: Intake Manifold Bolts

    ^ Might be a good idea. I'd suggest just tightening them for now to make it easy on yourself, cause it'll be hard/impossible to get all the bolts out without removing the fuel rail. Then, down the road, if you find them to be loose again, then you hit em with the loctite.


    update: took my first 100-mile highway trip following this procedure and got up to 23 mpg avg, up from the usual 21. I like!

  4. #64
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    Re: Intake Manifold Bolts

    My torque wrench lowest setting was 15NM I used it anyway. Saw my MPG increase almost 4 gallons.

  5. #65
    DitkaFan is offline Cadillac Owners Member
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    Has anyone still in warranty approached their dealer about this issue? It seems pretty unacceptable that these bolts keep coming loose?

  6. #66
    CTBB is offline Cadillac Owners Fanatic
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    Re: Intake Manifold Bolts

    "It's def the bolt from home depot -"
    BIG MISTAKE using any of the cheap Chinese junk hardware from HD in a motor application, or any application that matters. Bolts like this are graded, and one should always make sure to replace them with the correct grade hardware. Check this out. http://www.boltdepot.com/fastener-in...Materials.aspx

    Glenn

  7. #67
    RippyPartsDept's Avatar
    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: Intake Manifold Bolts

    or get them from your nearest GM dealer ... they're only $2-$3 each
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
    Rippy is a Cadillac, Hummer, Saturn & Saab dealership - family owned and operated in Wilmington, NC since 1946
    We offer all forum members discounts on parts and freight - e: parts@rippyautomotive.com ph: 800-RIPPY-22
    <-- insert standard boilerplate about posts not necessarily representing my employer, etc -->

  8. #68
    CTBB is offline Cadillac Owners Fanatic
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    Re: Intake Manifold Bolts

    Quote Originally Posted by RippyPartsDept View Post
    or get them from your nearest GM dealer ... they're only $2-$3 each
    Matter of fact, I wasn't recommending them as a supplier, but for reference to my statement about hardware/bolt grading. Guess you didn't check the link?

    Glenn

  9. #69
    RippyPartsDept's Avatar
    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: Intake Manifold Bolts

    ah yeah i see... definitely a good link to have bookmarked
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
    Rippy is a Cadillac, Hummer, Saturn & Saab dealership - family owned and operated in Wilmington, NC since 1946
    We offer all forum members discounts on parts and freight - e: parts@rippyautomotive.com ph: 800-RIPPY-22
    <-- insert standard boilerplate about posts not necessarily representing my employer, etc -->

  10. #70
    EChas3's Avatar
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    Re: Intake Manifold Bolts

    When my wife's car was in for some other service, the dealer didn't charge for tightening them. They were surprised she asked them to check them and found them loose! She did take them brownies once!

    The symptom was occasional rough idle when cold (backing out of garage). It never lit idiot lights or set codes but hasn't done it since.

  11. #71
    DitkaFan is offline Cadillac Owners Member
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    I was looking at purchasing an 09 STS n* from my local dealership. I asked for a double check of the intake bolts and got the following response... This seems like a sign to walk away, thoughts?
    "Regarding the loose intake bolt issue you mentioned, each of our cars goes through an intensive 125-point inspection before hitting our sales lot. Also, known issues to a make and model are specifically examined by our mechanics as part of the inspection/re-conditioning process. We therefore can't ask them to re-check something that's already been inspected"

  12. #72
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    Re: Intake Manifold Bolts

    I wouldn't let something so simple dampen my interest. I'd be detting a CPO warranty, anyway. If it runs well on test drives, you're covered.

    They are arrogant, though. You might be wise to walk away.

  13. #73
    Grunder is offline Cadillac Owners Member
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    Re: Intake Manifold Bolts

    2008 STS4 V6 DI
    I've read and re-read this thread, and so far the definitive answer to the question "does this also pertain to the V6 DI engine" has not been answered. Does anyone have the correct answer for this?

    Is it just as easy to check as the N*, or is there more to it on the V6. Should it/can it be done anyway, just because? It seems that some of the same symptoms that have been listed throughout this thread are plaguing our V6, that's why I'm asking....

    Thanks,
    John

  14. #74
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    Re: Intake Manifold Bolts

    Quote Originally Posted by DitkaFan View Post
    "Regarding the loose intake bolt issue you mentioned, each of our cars goes through an intensive 125-point inspection before hitting our sales lot. Also, known issues to a make and model are specifically examined by our mechanics as part of the inspection/re-conditioning process. We therefore can't ask them to re-check something that's already been inspected"
    Okay, $50.00 to the first person who can provide me with a legit pre-sales used car mechanical inspection form that states to check the torque on various engine bolts. This has to be one of the most ridiculous things I've heard from a used car salesman. If this was truly the case (that this has now been added to the 125 point inspection), I'd expect to have seen a service bulletin from GM about this ongoing issue. If you're happy with the car and it's in good shape, I don't know that I'd walk away if the price was right. This isn't necessarily a reflection on the service department either. But, this is one reason the consumer has to do their homework and be smarter than the salesman.

  15. #75
    EChas3's Avatar
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    Re: Intake Manifold Bolts

    The CPO Checklist includes both a fuel system check and vaccum system check.CPO Checklist.JPG

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