my BMW 5 Series F10/F11 (2010-2017) struggles to start in cold weather what should I check

Solution

1. Preparation

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

2. Battery Maintenance

• Inspect Battery Terminals:
  • Clean terminals using a wire brush if corrosion is present.
  • Tighten connections to ensure a solid electrical contact.
• Test Battery Health:
  • If the battery voltage is below 12.4 volts, consider charging or replacing the battery.

3. Starter Motor Inspection

• Remove Starter Motor:
  • Disconnect wiring harness from the starter motor.
  • Unbolt the starter motor from its mounting location using a socket set.
• Test Starter Motor:
  • Bench test the starter motor with jumper cables to ensure it spins freely.

4. Fuel System Check

• Inspect Fuel Filter:
  • Locate the fuel filter and check for blockages or wear.
  • Replace if necessary, using appropriate fuel line disconnect tools.
• Check Fuel Pressure:
  • Connect a fuel pressure gauge to the fuel rail and ensure it meets manufacturer specifications.

5. Engine Oil Check

• Check Oil Condition:
  • Inspect oil level and viscosity; if too thick for cold weather, consider using a lower viscosity oil as per manufacturer recommendations.