Cold Start Fuel Injection Quantity A Higher Than Expected

Common symptoms

What you'll notice

• Check the throttle body for any build
• up or clogging and clean if necessary
• Inspect the fuel injectors for any clogging or leakage and replace if needed
• Ensure that the engine coolant temperature sensor is functioning properly and replace if faulty
• Check the intake air temperature sensor for any issues and replace if necessary
• Verify that the mass airflow sensor is working correctly and replace if deemed faulty

Common causes

Most likely first

1. Faulty fuel injector
2. Fuel pressure regulator malfunction
3. Clogged or dirty fuel injectors
4. Engine coolant temperature sensor malfunction
5. ECM (engine control module) software issue

How to diagnose & fix

Work through it in order

1. Difficulty starting the engine during cold weather
2. Rough idle or stalling when starting the engine
3. Poor fuel efficiency
4. Engine misfires or hesitation during acceleration
5. Check engine light illumination