how to fix rough start in Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Battery Inspection

• Tools Required: Multimeter, socket set
• Disconnect the negative terminal of the battery.
• Use a multimeter to check the battery voltage; it should read around 12.6 volts.
• Clean battery terminals and connections if corrosion is present. Reconnect the negative terminal.

3. Fuel System Check

• Tools Required: Fuel pressure gauge
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition to the "ON" position without starting the engine.
• Check for the specified fuel pressure (typically around 50-60 psi for the MK7). If pressure is low, inspect the fuel pump and filter.

4. Spark Plug Replacement

• Tools Required: Socket set, torque wrench
• Remove the ignition coils using the socket set.
• Take out the spark plugs and inspect them for wear or deposits. Replace with OEM spark plugs if necessary.
• Reinstall ignition coils and torque them to the manufacturer’s specifications.

5. Air Filter and Throttle Body Cleaning

• Tools Required: Screwdriver set, throttle body cleaner
• Remove the air filter and inspect it; replace if dirty.
• Remove the throttle body from the intake manifold (ensure to disconnect any sensors).
• Clean the throttle body using throttle body cleaner and a soft cloth, focusing on the inside and the butterfly valve.
• Reinstall the throttle body and air filter.