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slight disengagment feel sometimes when shifting...
Is this the sign of worn subframe bushings? Its like torque on, then shift, torque off, then something moves a bit, then torque on with next shift. Feels slightly disconnected somewhere in the driveline.
| | Reply » slight disengagment feel sometimes when shifting... |
possible guibo but not certain. From Rogue Engineering -
Drivetrain Guibo
A common wear item on BMWs over a period of time is the drivetrain guibo. The guibo serves as an interface between the transmission and the driveshaft. Since the guibo is primarily made from rubber, it acts as a damper when shifting and engaging into gears, so that the transfer of power to the driveshaft is smooth and dampened, instead of abrupt and harsh.
Replacement of the guibo depends on age and driving style. We have seen vehicles less than 12 months old with 15,000 miles that had already started developing cracks around the bolt holes. We have also seen vehicles over 5 years old and over 100,000 miles with guibos without any stress cracks whatsoever. Needless to say, if you drive your car aggressively, your guibo may have to be replaced sooner than others.
Without a visual inspection of the guibo itself, an audio sign that the guibo may have started to crack is a "clicking" noise under specific circumstances. Below is a method we've been able to replicate the "clicking" sound.
Step 1: Find a straight, downhill section of road that will allow you to maintain vehicle speed of between 15-25 mph.
Step 2: Begin accelerating, slowly, in first gear. Shift into 2nd gear, continue to depress the accelerator pedal slightly.
Step 3: While going down the hill, immediate LIFT OFF the accelerator pedal. The vehicle should immediately start slowing under engine power. At this point of immediate release, the "click" should be audible.
Step 4: If "clicking" sound is audible, inspect vehicle guibo to determine if it is indeed cracked or fractured.
For E36 and E46 vehicles, using the guibo from the E46 M3 (BMW # 26 11 2 226 527) is a good upgrade as it is already used in the following vehicles.
E34 M5
E36 M3 (US and Euro)
E46 M3
Z3 M Roadster/Coupe
Installation requires removal of the exhaust and driveshaft center bearing as a minimum.
| | Reply » slight disengagment feel sometimes when shifting... |
hey thanks for the good info!
I totally didn't even think about the Guibo being the curlprit. I think I will have to get under there to take a look around. Thats what it does feel like, the power is getting disconnected and connected abrubptly. The weird thing is if I drive it harder (shift faster) there is nothing noticeable, but if I baby it, I seem to feel it more.
| | Reply » slight disengagment feel sometimes when shifting... |
Quote: hey thanks for the good info!
I totally didn't even think about the Guibo being the curlprit. I think I will have to get under there to take a look around. Thats what it does feel like, the power is getting disconnected and connected abrubptly. The weird thing is if I drive it harder (shift faster) there is nothing noticeable, but if I baby it, I seem to feel it more. | OMG, this is exactly what I was feeling esp. after the car has sat in a cold garage for a prolong period of time.
Yet when I shift it hard & fast, it seems fine...
| | Reply » slight disengagment feel sometimes when shifting... |
and its most noteable in the morning during a cold take off. I think its the guibo now more and more after thinking about the properties of hard rubber.
| | Reply » slight disengagment feel sometimes when shifting... |
Quote: | and its most noteable in the morning during a cold take off. I think its the guibo now more and more after thinking about the properties of hard rubber. |
YES!! I should have listened to my dealer last year when he said it was cracked.
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slight disengagment feel sometimes when shifting...