why does my Renault Clio V (2019-Present) make a hissing noise when starting

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Inspect and Repair Vacuum Lines

• Tools Required: Pliers, flashlight
• Sub-steps:
  1. Visually inspect all vacuum lines and hoses connected to the intake manifold for cracks or disconnections.
  2. If a damaged hose is found, remove it using pliers and replace it with a new hose of the same diameter.
  3. Secure all connections to prevent future leaks.

3. Examine Throttle Body

• Tools Required: Socket set, throttle body cleaner
• Sub-steps:
  1. Remove the air intake duct from the throttle body by loosening the clamps.
  2. Clean the throttle body with throttle body cleaner and a soft cloth, ensuring the plate moves freely.
  3. Reinstall the air intake duct and secure it properly.

4. Check Fuel System

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition key to the "ON" position without starting the engine to check fuel pressure.
  3. If pressure is below specifications, inspect the fuel pump and filter for proper operation.