Single Fuel Injector for Isuzu 4HF1 Engine — NKR / NQR Trucks

Replace a single failed injector and restore proper fuel delivery to your Isuzu-powered commercial truck. This OEM-replacement fuel injector is precision-matched to Isuzu factory specifications for the 4HF1 engine — delivering consistent fuel atomization, smooth idle, and reliable performance with no modifications required.

✅ What's Included

• 1 × Fuel Injector
• Part Numbers: 8971198120 / 8-97119812-0

🔧 Compatible With

• Isuzu Engine: 4HF1
• Isuzu Trucks: NKR, NQR
• Fits other Isuzu commercial vehicles and equipment powered by the 4HF1 engine

⚙️ Key Features

• Direct OEM replacement — plug-and-play fitment, no modifications required
• Precision-calibrated nozzle for consistent fuel atomization
• Restores fuel efficiency, power output, and smooth idle
• Eliminates hard starting, misfires, rough idle, and excessive exhaust smoke
• Manufactured to meet or exceed original Isuzu specifications

💡 Need a Full Set?

For complete engine balance and maximum uptime, consider our 4-Pack Set — replacing all injectors at once ensures uniform fuel delivery across all cylinders, improves fuel economy, and reduces future labor costs. View the 4-Pack →

🛠️ Signs Your Injector Needs Replacing

• Hard starting or extended crank time
• Rough idle or engine surging under load
• Black or white exhaust smoke
• Loss of power or reduced payload performance
• Increased fuel consumption
• Diagnostic fault codes related to fuel delivery

SKU: 8971198120  |  Fits: Isuzu 4HF1 / NKR / NQR  |  Qty: 1 Injector per Order