4-Pack Fuel Injectors for Isuzu 4HF1 Engine — NKR / NQR Trucks

Restore peak fuel delivery and engine performance to your Isuzu-powered commercial truck with this complete set of 4 OEM-replacement fuel injectors. Precision-matched to Isuzu factory specifications for the 4HF1 engine, these injectors eliminate misfires, rough idle, and power loss — keeping your NKR or NQR on the road with minimal downtime.

✅ What's Included

• 4 × Fuel Injectors (complete set)
• 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 across all cylinders
• 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
• Sold as a full set of 4 for balanced, uniform fuel delivery

💡 Why Replace All 4 Injectors at Once?

For commercial trucks, uneven injector wear leads to cylinder imbalance, reduced payload performance, and increased fuel costs. Replacing the full set ensures uniform combustion across all cylinders — maximizing uptime, improving fuel economy, and extending engine life between major services.

🛠️ Signs Your Injectors Need 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

📦 Why Buy from Fuel Parts Depot?

We specialize in commercial vehicle and heavy equipment fuel system components. Every part is sourced for quality and fitment accuracy — so you can order with confidence and keep your fleet on the road.

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