Shuttering on acceleration?

1997 BMW Z3
250,000 MILES • 1.9L • 4 CYL • 2WD • MANUAL
Avatar
SM_USIC
  • MEMBER
  • 7 POSTS
In 1st gear when accelerating there is a shuttering feeling as the engine passes 3,000 RPMs, it can be avoided by shifting early however shifting too early will result in the same shuttering being felt upon engaging 2nd gear.

(Sometimes the shuttering around 3,000 RPMs can be felt in 3rd however it is significantly less noticeable)

What could be causing this?
Dec 6, 2023 at 7:44 AM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

Does this only happen in first and second gear? Have you ever noticed it in a different gear? It could be related to the clutch is why I ask.

Also, it does have some miles on it, there could be a bearing issue in the transmission or drive train that is noticeable in lower gears.

Do me a favor. First, make sure the transmission fluid is both clean and full, and let me know what you find.

I attached a pic showing where the fill plug is located. It is highlighted. The bolt with the X on it is the drain, so don't open that one unless you plan to change the fluid.

Let me know what you find. Also, let me know if there are any noises when you experience this.

Take care,

Joe

See pic below.
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Dec 6, 2023 at 8:11 PM
Avatar
SM_USIC
  • MEMBER
  • 7 POSTS
Thank you, I will check the fluid. It can be felt in 3rd at times however it's less noticeable.
Dec 7, 2023 at 4:35 AM
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

Let me know what you find. Often, manual transmissions aren't serviced, so that could be an issue.

Take care,

Joe
Dec 7, 2023 at 8:18 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.