why does my Volvo XC90 Second Generation (2015-2024) engine hesitate when I accelerate?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during the repair.
• Allow the engine to cool down if it has been running.

2. Address Fuel System Issues

• Sub-step 1: If fuel pressure is low, inspect and replace the fuel filter if clogged.
• Sub-step 2: Check the fuel pump for proper operation; replace if faulty.
• Sub-step 3: Ensure fuel injectors are clean and functioning; clean or replace as necessary.

3. Inspect and Replace Spark Plugs

• Sub-step 1: Remove the engine cover if necessary to access the spark plugs.
• Sub-step 2: Use a socket wrench to remove spark plugs; inspect for wear or fouling.
• Sub-step 3: Install new spark plugs with the correct gap and torque specifications (typically 15-20 Nm).

4. Test and Replace Throttle Position Sensor

• Sub-step 1: Disconnect the electrical connector from the TPS.
• Sub-step 2: Use a multimeter to check resistance across the terminals while moving the throttle; it should show a smooth transition.
• Sub-step 3: If faulty, remove the TPS and install a new one, ensuring proper alignment and connection.

5. Inspect Ignition Coils

• Sub-step 1: Remove the ignition coils from their respective cylinders.
• Sub-step 2: Use a multimeter to check for proper resistance; replace any that are out of specification.
• Sub-step 3: Reinstall the ignition coils and ensure they are securely connected.