what could cause my Honda Pilot YF3 (2016-2022) to stall at highway speeds

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, fuel pressure gauge, basic hand tools.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to prevent electrical shorts.

2. Fuel System Inspection

• Tools Required: Fuel pressure gauge.
• Remove the fuel pump relay from the fuse box.
• Connect the fuel pressure gauge to the fuel rail's service port.
• Turn the ignition to the "ON" position (do not start) and check the fuel pressure reading; it should be within the manufacturer's specifications.
• If the pressure is low, replace the fuel pump and/or fuel filter.

3. Ignition System Repair

• Tools Required: Socket set, torque wrench.
• Remove the engine cover if applicable.
• Disconnect and remove the ignition coils from the spark plugs.
• Inspect the spark plugs for wear and carbon buildup; replace if necessary.
• Test ignition coils with a multimeter for proper resistance; replace any faulty coils.
• Reinstall components and torque to manufacturer specifications.

4. Throttle Body Cleaning

• Tools Required: Throttle body cleaner, soft brush.
• Remove the air intake duct to access the throttle body.
• Spray throttle body cleaner inside the throttle body and use a soft brush to remove carbon buildup.
• Open the throttle plate manually (if applicable) to clean the internal surfaces thoroughly.
• Reassemble the intake duct and ensure all connections are secure.

5. Electrical System Check

• Tools Required: Multimeter.
• Inspect all relevant electrical connections and wiring for signs of corrosion or damage.
• Use a multimeter to check for proper voltage at the fuel pump and ignition components while the engine is running.
• Repair or replace any damaged wiring.