Why does my Mercedes-Benz E-Class feel sluggish during acceleration, especially in city traffic?

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Why does my Mercedes-Benz E-Class feel sluggish during acceleration, especially in city traffic?

I drive a Mercedes E-Class W212, and I’ve noticed a delay o r hesitation when accelerating, especially at low speeds o r during stop-and-go traffic in Lahore. The engine doesn’t respond as quickly as before. Could this be due to fuel quality, clogged filters, o r throttle body issues? What should I check to restore performance?

Talha Kyanii asked on 11 Oct 2025 11:42:53 am

1 Answer

6 views |

Gari Master - on 11 Oct 2025 11:43:41 am

Possible causes:

Dirty throttle body o r EGR valve: Reduces airflow and engine response.

Clogged fuel injectors o r fuel filter: Affects fuel delivery, especially with lower fuel quality in Pakistan.

Low-quality o r contaminated petrol: Can cause pre-detonation o r sluggish combustion.

Failing Mass Air Flow MAF sensor o r O2 sensor: Sends incorrect data to the ECU, affecting acceleration.

Transmission issues: If the gear shifts are delayed o r jerky, acceleration will feel slow.

What to do:

Clean the throttle body and inspect the EGR system.

Use a fuel injector cleaner o r have injectors professionally cleaned.

Try using a trusted high-octane fuel and avoid filling from unknown pumps.

Have the car scanned using a proper diagnostic tool preferably STAR Diagnosis.

Check the transmission for fluid condition and update if necessary.