why does my BMW 3 Series E90/E91 (2005-2012) feel sluggish when accelerating

Solution

1. Preparation

• Gather tools and parts necessary for repairs.
• Disconnect the battery to ensure safety before working on electrical systems.

2. Replace Air Filter

• Remove the air filter housing cover using a socket set.
• Replace the air filter with a new one, ensuring it fits securely.
• Reassemble the air intake system.

3. Clean or Replace Fuel Filter

• Locate the fuel filter (usually in the fuel line).
• Relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
• Disconnect the fuel lines from the filter using appropriate tools.
• Replace the old fuel filter with a new one, ensuring the flow direction is correct.

4. Inspect and Replace Spark Plugs

• Remove the ignition coil packs using a socket set.
• Remove old spark plugs using a spark plug socket and inspect for wear.
• Install new spark plugs, ensuring they are gapped correctly (typically 0.032-0.036 inches for BMW).
• Reinstall the ignition coil packs.

5. Throttle Position Sensor (TPS) Replacement

• Disconnect the electrical connector from the TPS.
• Remove the mounting screws and take out the old TPS.
• Install the new TPS and reconnect the electrical connector.

6. Exhaust System Inspection

• Inspect the exhaust system visually for any signs of damage or blockages.
• If the catalytic converter is clogged, remove and replace it with a new unit.