why does my BMW X3 F25 (2011-2018) engine hesitate when I accelerate

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.
• Allow the engine to cool down if it has been running.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the engine cover if applicable.
• Disconnect the ignition coils from the spark plugs.
• Remove the spark plugs using a spark plug socket.
• Inspect the spark plugs for wear; replace them if they are fouled or worn beyond specifications.
• Install new spark plugs, ensuring they are gapped correctly, and torque them to the manufacturer’s specification (typically around 22 Nm).
• Reconnect the ignition coils and the engine cover.

3. Fuel System Inspection

• Tools Required: Fuel pressure gauge, fuel line disconnect tools.
• Locate the fuel rail and connect the fuel pressure gauge to the Schrader valve.
• Turn the ignition on (without starting the engine) to check the fuel pressure; it should meet manufacturer specifications (usually around 50-60 psi).
• If the pressure is low, check the fuel pump and fuel filter for clogs or failures.
• Replace the fuel filter if it is clogged and consider replacing the fuel pump if it is not functioning correctly.

4. Clean the Throttle Body

• Tools Required: Throttle body cleaner, soft brush, microfiber cloth.
• Disconnect the throttle body connector and remove the intake duct.
• Remove the throttle body from the intake manifold by unscrewing the bolts.
• Spray throttle body cleaner inside the throttle body and scrub gently with a soft brush.
• Wipe clean with a microfiber cloth and ensure no residue remains.
• Reinstall the throttle body and reconnect the intake duct and electrical connector.