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Thread: Slight rumble?

  1. #1

    Slight rumble?

    Hi all,

    Canít find any other explanations on the internet, and I guess since Iím not the best versed at anything specific, Iíd ask here.

    Whenever Iím coming to a stop, eventually going from 1st to neutral, I feel a slight rumble in the car just about a second while coming to a stop.

    The clutch has never been done, as my seller beforehand saw no previous need to.

    Anything would be appreciated!
    1991 E30 AlpinweiŖ 325iX [SOLD]
    2005 E46 Sparkling Graphite Metallic 330Ci ZHP 6spd

  2. #2
    injectors reactivating

  3. #3
    Join Date
    Jan 1970
    Location
    Branford, CT
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    15,604
    Quote Originally Posted by Fried_Chicken View Post
    injectors reactivating
    ?
    We don't have cylinder deactivation as a feature...

    Sent from my Pixel 3 using Tapatalk
    BP
    2005 330i ZHP / 6MT
    Imolarot / Naturbraun



    It's not the car you drive, it's how you drive it.

  4. #4
    Quote Originally Posted by az3579 View Post
    ?
    We don't have cylinder deactivation as a feature...

    Sent from my Pixel 3 using Tapatalk
    Yes we do

  5. #5
    Join Date
    Feb 2011
    Location
    Lexington, KY
    Posts
    3,946
    Wait are you downshifting in first gear?

    A rumble on starting in first makes more sense.
    CDV delete, KONI STR-T & KYB Excel-G, Weisslichts, Stewart H2O pump....
    http://s900.photobucket.com/user/othibau/media/Junesig.jpg.html][IMG]http://i900.photobucket.com/albums/ac208/othibau/Junesig.jpg

  6. #6
    Join Date
    Jan 1970
    Location
    Branford, CT
    Posts
    15,604
    Quote Originally Posted by Fried_Chicken View Post
    Yes we do
    No... We don't. Lol

    Cylinder deactivation insuinuates the ability to drive with a certain number of cylinders not active. Our M54 engines do not have this feature. It's either all injectors firing (in their respective orders) or none at all (off throttle deceleration). Their transition from off to on is seamless, unlike some cars with actual cylinder deactivation, which you can sometimes feel depending on load or engine.


    Quote Originally Posted by Oli77 View Post
    Wait are you downshifting in first gear?

    A rumble on starting in first makes more sense.
    A rumble when first starting off could be a bad guibo or maybe diff bushings. Usually driveline related in this case, some sort of rubber failing.

    Sent from my Pixel 3 using Tapatalk
    BP
    2005 330i ZHP / 6MT
    Imolarot / Naturbraun



    It's not the car you drive, it's how you drive it.

  7. #7
    Quote Originally Posted by az3579 View Post
    No... We don't. Lol

    Cylinder deactivation insuinuates the ability to drive with a certain number of cylinders not active. Our M54 engines do not have this feature. It's either all injectors firing (in their respective orders) or none at all (off throttle deceleration). Their transition from off to on is seamless, unlike some cars with actual cylinder deactivation, which you can sometimes feel depending on load or engine.




    A rumble when first starting off could be a bad guibo or maybe diff bushings. Usually driveline related in this case, some sort of rubber failing.

    Sent from my Pixel 3 using Tapatalk
    We have “off throttle decelration”. Where all the ciylinders get deactivated. Cylinder. Deactivation. Only while in gear.
    Right before coming to a stop, the injectors will start up again, and this can be felt as a *very* slight rumble.

  8. #8
    Quote Originally Posted by Oli77 View Post
    Wait are you downshifting in first gear?

    A rumble on starting in first makes more sense.
    Well Iím coming to a stop, from first to neutral. Only after I come to a full stop, I feel the slight rumble for about one second. Also, at times, it seems as if I canít shift into first, as the shifter stops in between neutral at first. A few friends recommended I do a transmission fluid change first to see if that fixed anything. The clutch has never been done and Iím at about 96k miles so I guess Iíve answered my own question hahah.
    1991 E30 AlpinweiŖ 325iX [SOLD]
    2005 E46 Sparkling Graphite Metallic 330Ci ZHP 6spd

  9. #9
    Join Date
    Feb 2011
    Location
    Lexington, KY
    Posts
    3,946
    So the rumble has nothing to do with the clutch if you feel it only when at a full stop.

    I would look at the idle control valve (ICV) maybe, could be sticking?

    I always downshift to second if I am coming to a complete stop and then go into neutral. I never downshift into first, or very rarely, if I need to get going right soon.
    CDV delete, KONI STR-T & KYB Excel-G, Weisslichts, Stewart H2O pump....
    http://s900.photobucket.com/user/othibau/media/Junesig.jpg.html][IMG]http://i900.photobucket.com/albums/ac208/othibau/Junesig.jpg

  10. #10
    Quote Originally Posted by Fried_Chicken View Post
    We have ďoff throttle decelrationĒ. Where all the ciylinders get deactivated. Cylinder. Deactivation. Only while in gear.
    Right before coming to a stop, the injectors will start up again, and this can be felt as a *very* slight rumble.
    Is this why the transition from very slight throttle to zero throttle (and sometimes vice versa) can feel like stuttering/shaking?

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