2016 Honda Pilot GDI Injector Replacement: Diagnosis and Repair

Diagnosis of Misfire Codes

• 💡 The 2016 Honda Pilot presented with a "check engine" light and misfires on all six cylinders (P0301-P0306).
• ⚠️ Additional codes included P0430 (catalyst efficiency), P219A/P219B (post-catalyst fuel trim), and P0300/P0296 (post-catalyst fuel trim).
• 🔍 The vehicle had approximately 200,000 miles and had previously been at another shop without a resolution.

Common Honda Issue and Service Bulletin

• 🛠️ This issue is common on higher-mileage Honda vehicles, and Honda has a specific service bulletin addressing it.
• 🚗 The recommended fix involves replacing all six GDI injectors and performing a software update for the engine computer.
• ⚠️ The existing mass airflow sensor was found to be faulty, over-reporting air intake and contributing to problems.

Disassembly and Component Removal

• ⚙️ The process requires removing the intake manifold, throttle body, EGR tubes, and various hoses and sensors.
• 🔩 Accessing some components, like the ECM cover and certain hose clamps, proved challenging due to Honda's design.
• 🔌 Disconnecting fuel lines and electrical connectors for the high-pressure fuel pump and injectors requires careful manipulation.

GDI Injector Replacement Procedure

• 🚀 New GDI injectors from Honda, which come pre-sized with Teflon seals, are installed.
• 💧 Lubricating the top O-rings with silicone grease is suggested for easier installation, though it's noted that some commenters claim it can poison the catalytic converter.
• ✅ Injectors are installed one by one, with electrical connectors plugged in as they are seated.

Reassembly and Final Checks

• 🔧 After injector replacement, the fuel rail is reinstalled, and components like the intake manifold, throttle body, and EGR pipe are reattached.
• 🔩 Bolts and nuts are torqued to factory specifications, and new gaskets are installed where necessary.
• 🚗 The vehicle requires a software update and potentially a throttle relearn procedure after the repairs are completed.
• ⚠️ The video notes that GDI engines can sometimes be difficult to start after injector or fuel pump work and may run rough initially.