why does my Toyota RAV4 have poor acceleration after a cold start

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Clean or Replace the Air Filter

• Remove the air filter cover.
• Inspect the air filter; if dirty, replace it with a new one.
• Reinstall the air filter cover securely.

3. Clean the Throttle Body

• Remove the intake duct connected to the throttle body.
• Use throttle body cleaner and a soft brush to clean the throttle plate and bore.
• Allow the cleaner to evaporate and reassemble the intake duct.

4. Test and Replace Fuel Pressure Regulator (if necessary)

• Connect the fuel pressure gauge to the fuel rail.
• Start the engine and check the fuel pressure; it should align with specifications (usually around 30-40 psi for most RAV4 models).
• If pressure is low, replace the fuel pressure regulator and recheck the pressure.

5. Inspect and Replace Coolant Temperature Sensor

• Locate the coolant temperature sensor (usually near the thermostat housing).
• Disconnect the electrical connector and remove the sensor.
• Install a new sensor and reconnect the electrical connector.

6. Check for Vacuum Leaks

• Visually inspect all hoses and gaskets connected to the intake manifold.
• Use a smoke machine or carburetor cleaner around suspected areas and watch for changes in engine idle.
• Replace any damaged hoses or gaskets found.