BMW 335i xDrive rough idle and loss of power at cold start after throttle body charge pipe replacement on BMW 335i xDrive

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some BMW 335i xDrive owners report experiencing rough idle and loss of power after replacing the throttle body charge pipe. These issues may stem from misfires, faulty injectors, or compression problems, particularly noticeable during cold starts. Additionally, owners have noted that loss of power can be linked to defective ignition coils, faulty injectors, or a malfunctioning Mass Airflow Sensor (MAF), all of which can adversely affect engine performance. Furthermore, some owners emphasize the importance of checking for leaks in the intake piping, as a hissing sound under boost could indicate a problem that contributes to rough idling and power loss. It's also crucial for owners to verify that the charge pipe is securely connected, as a blown-off charge pipe can lead to a sudden loss of power and related symptoms. To effectively diagnose and resolve these issues, thorough inspection of these areas is recommended.

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