vibrations and surging....
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Thread: vibrations and surging....

  1. #1
    Newbie
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    vibrations and surging....

    Hi everybody! I'm a newbie to the site. My wife 2012 ! has 4000 miles. Here is one of our issues, either hot or cold engine, at a red stop light, with foot on brake and in gear, the engine will vibrate, sometimes barely noticeable, at other times passengers are wondering what's going on. Most of the time, this car is very smooth.... Now that it is getting warmer here (AZ.), we are using the A/C more, when slowing down to stop at a red light, A/C on, no gas pedal input, the engine will "surge" , rev up with a slight forward thrust then comeback to normal operation.
    For the first problem, car was look over at first oil change, to be told "not able to verify". It is going back in this Friday for a broken vent, again I will have them look at these situation.
    Any ideas, happened to you? Also, no matter how we drive it A/C on or off, same for econ button, getting only 25 to 25.4 mpg, city or highway, don't matter. Could it be all related?
    Thanks for reading me!

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  3. #2
    Elder Soul Darklight's Avatar
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    Welcome to the forum. I'm getting the intermittent, barely noticeable brake pedal vibration at stop lights too. Since it's a problem that happens without regularity or predictability it will be hard to get a dealer to be able to deal with it since they don't drive it every day. There is another thread on rough idle here with similar complaints which may relate to the surging you mention. There is a gas mileage complaint thread too - in fact a few. Searching is your friend. Let us know how you resolve it, if you do.

    If it's a broken dash vent can you tell me if they have to remove the entire dash to fix it? I have one that needs attention too.
    Last edited by Darklight; 04-10-2012 at 03:51 PM.
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  4. #3
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    I'll let you know after Friday about the dash vent! As for the other problems, it is not "braking" that is the problem but the engine that vibrates and surges!

  5. #4
    Elder Soul tempest's Avatar
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    as the AC will sap a bit of engine power, i would expect the cars electronics to just raise the idle speed slightly when its on at tickover, to leave enough power for the other ancillaries...... whether this increase in revs is causing the surging or vibration - i dont know.
    Tempest CRDI

    Walking Cane grey

  6. #5
    Elder Soul Darklight's Avatar
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    Quote Originally Posted by mysoul1 View Post
    I'll let you know after Friday about the dash vent! As for the other problems, it is not "braking" that is the problem but the engine that vibrates and surges!
    I know it's not braking, I only stated that I feel the slight vibration while my foot is on the brake pedal at a stop light. The weirdest part of it is that it only happens every so often and for no apparent reason and I don't see any change in the RPMs on the tach.
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  7. #6
    Intermediate Soul Family Full of them's Avatar
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    Quote Originally Posted by Darklight View Post
    I know it's not braking, I only stated that I feel the slight vibration while my foot is on the brake pedal at a stop light. The weirdest part of it is that it only happens every so often and for no apparent reason and I don't see any change in the RPMs on the tach.
    If it is of any consolation to you folks, my XB and my Matrix did exactly the same thing. My Souls do it also but ever so slightly. I believe it comes from the fuel injection modules as they try to adjust for changing temp, humidity and driving conditions. Just a guess though. Dealers have all told me it is normal idling.

  8. #7
    Junior Soul 50-50's Avatar
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    I have this same vibration! It annoys the heck out of me!

  9. #8
    Intermediate Soul
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    It seems my wifes ! w/2265 miles at times idles slightly rough when; driven,parked about an hour,restarted & sitting at next stoplight,not far from restart & not completely re-warmed up. Noticed this yesterday after grocery shopping. Will see if it occurs at other scenarios. Not bad,but just not silky as usual. Good place to blame the ethanol IMO.

  10. #9
    Intermediate Soul Family Full of them's Avatar
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    Quote Originally Posted by 50-50 View Post
    I have this same vibration! It annoys the heck out of me!
    Yes, I notice it everytime a car does it. I always wait a few moments now to make sure it calms down. It is annoying sometimes but I have largely gotten used to it with the other cars so when the Soul does it I am not as concerned.

  11. #10
    Elder Soul
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    Yup, I have this too.

    Sent from my HTC Inspire using Tapatalk. Pardon errors

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