what causes my Toyota Tacoma N300 (2016-Present) to stall at stop lights

Solution

1. Preparation

• Gather tools and safety gear.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Fuel System Inspection

• Tools Required: Fuel pressure gauge, socket set
• Remove the fuel pump relay from the fuse box.
• Connect the fuel pressure gauge to the fuel rail service port.
• Reconnect the battery and turn the ignition to the "ON" position (do not start the engine).
• Check the fuel pressure reading; it should match manufacturer specifications (typically 50-60 psi).
• If pressure is low, inspect the fuel pump and filter for issues.

3. Throttle Body Cleaning

• Tools Required: Throttle body cleaner, screwdriver
• Remove the air intake duct to access the throttle body.
• Spray throttle body cleaner inside the throttle body while opening the throttle plate manually.
• Wipe clean with a lint-free cloth.
• Reinstall the air intake duct.

4. Idle Air Control Valve (IAC) Inspection

• Tools Required: Socket set, cleaning solvent
• Remove the IAC valve from its housing.
• Inspect for carbon buildup and clean as necessary using cleaning solvent.
• Reinstall the IAC valve securely.

5. Battery and Alternator Test

• Tools Required: Multimeter
• With the engine running, use a multimeter to check the voltage at the battery terminals; it should read between 13.7 to 14.7 volts.
• If the voltage falls below this range when the engine is running, check the alternator and battery connections for corrosion or looseness.

6. Vacuum Line Inspection

• Visually inspect all vacuum lines for cracks or disconnections.
• Replace any damaged vacuum lines and ensure all connections are secure.