Acceleration hesitation 07 STS 4 V8
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  • 1 Post By dkozloski
Cadillac STS Forum - 2005 through 2012 Discussion, Acceleration hesitation 07 STS 4 V8 in Past Cadillac Vehicle Discussion; Hi all- how bad is your downshift delay? When I am going along at a constant speed and then need ...
  1. #1
    Alden's Daddy is offline Cadillac Owners Member
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    Acceleration hesitation 07 STS 4 V8

    Hi all- how bad is your downshift delay? When I am going along at a constant speed and then need to accelerate, it feels almost like the car shuts off for a second, then downshifts and accelerates. Anybody ever experience this? Thanks.

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    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: Acceleration hesitation 07 STS 4 V8

    My wife's RWD has the 6-speed and the downshift seems slower but the gearing is so different that the comparison isn't a fair one. At 2,000 RPM, I'm going 62 MPH & her car is cruising at 80!

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    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Acceleration hesitation 07 STS 4 V8

    Quote Originally Posted by Alden's Daddy View Post
    Hi all- how bad is your downshift delay? When I am going along at a constant speed and then need to accelerate, it feels almost like the car shuts off for a second, then downshifts and accelerates. Anybody ever experience this? Thanks.
    It depends on your speed at the time you nail it. You're feeling the TCM sychronizing internal gear speeds. It's the same as if you were driving a manual trans, shifted to neutral, blipped the throttle to synchronize the gears, and then completed the downshift.
    Don't mess with Binky Bear!


  5. #4
    chrisgotgigs is offline Cadillac Owners Member
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    I just purchased an 07 STS 4. I have experienced the same problem. I just got the car so I thought I must have had it in the wrong mode (touring vs normal) and I don't know how to switch modes. I need to get this checked while I still have a dealers warranty, especially if it's not the mode. I will let you know if I find a solution

  6. #5
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
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    Re: Acceleration hesitation 07 STS 4 V8

    There are 5 driving modes if you have Magnetic Ride Control, or 3 if you don't have MRC (you might argue that there are 6 and 4 if you have disabled TC and Stability Control).
    (2 for suspension and 3 for transmission)
    Touring or Performance are the options on the NAV screen for MRC.
    Drive or Sport Drive or Manual shift mode for the transmission.

    The DIC will show D or sD or M1-6 depending on transmission mode, you need to shift the gear selector lever to the right to enter sD and up/down to enter manual mode.
    The NAV will show Touring or Performance depending on your suspension setting.

    To me it seems that the hesitation is due to this having an electronic throttle / gas pedal instead of having an actual cable connected between the pedal and the engine. There are also some 'nannies' that are in place that try to protect the drivetrain from damage when you enter WOT.

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    KRSTS is offline Cadillac Owners Enthusiast
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    Re: Acceleration hesitation 07 STS 4 V8

    Hesitation is normal with "drive by wire"/ Mine does it also.

  8. #7
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
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    Re: Acceleration hesitation 07 STS 4 V8

    Basically you just have to learn the lag and basically punch it about 0.5 seconds before you would have normally done so when needing to pass.

  9. #8
    Guy.Seminerio is offline Cadillac Owners Connoisseur
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    Re: Acceleration hesitation 07 STS 4 V8

    Not sure what car you're coming from but if you're coming from an older car that's not set up as aggressively or doesn't have as many forward gears, when you nail it, it'll go down one gear and take off, whereas when you pin it on some newer cars, it may determine the power you're asking for requires a downshift 2-3 gears down. This takes an extra second. It can be irritating but you'll get used to it.

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    Ludacrisvp's Avatar
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    Re: Acceleration hesitation 07 STS 4 V8

    coming from 02 Deville DTS w/ 4spd N* and 01 monte carlo ss w/ 3.8 V6 w/ 4spd
    Both happen to be cable driven and have 2 less gears than what the STS has.
    The SRXs my parents have don't seem to have as much lag as the STS does but they are 5spd though .. not sure if they are drive by wire though.

  11. #10
    Aurora5000's Avatar
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    Re: Acceleration hesitation 07 STS 4 V8

    Sure miss the powerglide transmission...

  12. #11
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Acceleration hesitation 07 STS 4 V8

    Quote Originally Posted by Aurora5000 View Post
    Sure miss the powerglide transmission...
    You mean old peanut butter drive like a Buick Dynaflow. I prefer the old four speed Hydramatic with a fluid coupling rather than a torque convertor. With the iron case and steel fluid coupling they were bullet proof.
    kcaughron likes this.
    Don't mess with Binky Bear!


  13. #12
    EChas3's Avatar
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    Re: Acceleration hesitation 07 STS 4 V8

    More seriously, a dirty throttle body can lead to a jerk when starting. Long use while dirty can wear a groove that will cause trouble that cleaning can't correct; replace the TB. Less frequently, a worn or damaged throttle pedal/position sensor can lead to similar issues as can issues with the wiring harness near the connection to the throttle body (as happened with my 2006 and those of a few other members).

    -Added-

    At speed in my wife's RWD, we coast, almost idling. A bad throttle, wiring harness issue or sticky/worn TB could be causing issues.

    For STS models with MRC, the setting (Touring or Performance) is on the first Config screen on Nav-equipped models (a pre-req?) after 2007 OR those with the firmware upgrade. For older ones w/o the upgrade, it's buried on the Personal Information Settings where Driver settings are stored. (The firmware upgrade is well worth getting to use the latest Nav disks and various improvements but most dealers need guidance.)

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