2014 Isuzu NPR-HD 16 Box Truck

Fleet # – 
Year – 2014
Make – Isuzu
Model – NPR-HD 16
Body Style – Box Truck
VIN/SN – JALC4W16XE7002794
Odometer Numbers – 61202
Hours – 
Engine Make/Model – #4HK1-TC 5.2L Turbo
Cyl – 4
Fuel Type – Diesel
Transmission Name – 6-speed w/overdrive
Transmission Type – Automatic
Single Axle/Dual Axle – Single Axle Dual Wheel
Tire Size/Type – LT215/85R16
Tire Condition – Fair
Plow Size –  
Dump Box Size – 
Drivetrain – 4×2
GVWR – 14,500Lbs 

Does the unit operate? – Yes
Does the vehicle start? – Yes
Are keys available? – Yes
Ownership Information – Title
Mechanical Condition – Poor
Mechanical Notes – It starts runs and drives in low power mode. It will run and drive at 30-40mph and has trouble going up hills. This truck was mechanically good until this problem became intermittent, but now it remains in a low power state. This problem has gone undiagnosed. Being sold AS IS for repair.
Body Condition – Fair
Body Notes – The cab and chassis and transmission are in fair shape as well as the box. The Morgan 16' box is a model #GVFD09116086 and has (2) side service doors and rear roll up door.
Interior Condition – Fair
Misc Info – 

The following general information is web-sourced and may contain variances from the subject unit:

2014 Isuzu NPR-HD 16' Box Truck is a highly capable Class 4 low-cab-forward (LCF) medium-duty commercial workhorse. Combining a heavy-duty chassis, an ultra-reliable commercial powertrain, and a premium multi-access cargo body, it is optimized for high-volume city delivery and regional logistics.
 

The 4HK1-TC 5.2L Turbo-Diesel Engine

The heart of this truck is the Isuzu 4HK1-TC 5.2L overhead cam, 16-valve, 4-cylinder inline diesel engine. 

• Power Output: It delivers 215 horsepower at 2,500 RPM and a massive 452 lb-ft of torque at 1,850 RPM.
• Commercial Architecture: It features a highly durable cast-iron block with removable dry-type cylinder liners (wet-sleeve construction principles) for easy rebuilding and incredible commercial-grade longevity.
• Induction & Fueling: Equipped with an electronically controlled common-rail fuel injection system and a variable-geometry turbocharger (VGT) with an air-to-air intercooler for sharp throttle response and maximum fuel efficiency. 
• Emissions: The 2014 model year features a robust Selective Catalytic Reduction (SCR) system requiring Diesel Exhaust Fluid (DEF) alongside a Diesel Particulate Filter (DPF) to meet strict environmental standards.

Aisin Automatic Transmission & Controls

This truck is mated to a heavy-duty Aisin 6-speed automatic transmission (typically the Aisin A465 model). It is built specifically for commercial vehicles to handle continuous heavy payloads without overheating.

• The Floor Shifter: The stickshift layout gives you direct control for varying driving conditions:
  • D (Drive): Standard driving mode utilizing all 6 forward gears for maximum fuel economy.
  • 2 & 1 (Low Gears): Manually locks the transmission into 2nd or 1st gear. This is critical for engine braking when descending steep grades or when crawling through heavy construction zones with a max payload.
• The Two Stick Buttons:
  • Overdrive (O/D) Off Button: Typically prevents the transmission from shifting into top gear, giving you more torque on hills and preventing transmission "hunting" under load.
  • Exhaust Brake / Economy Mode Switch: One of these buttons generally controls Isuzu's integrated exhaust brake system (which uses a butterfly valve in the exhaust manifold to safely slow the vehicle without wearing out the wheel brakes), or toggles between ECO Mode (advancing shifts early for fuel savings) and power modes.

The Morgan 16' Box Body

The cargo area is a high-grade Morgan Corporation aluminum dry freight van body (Model #GVFD09116086).

• Dimensions: "16086" indicates a 16-foot exterior length, an approx. 96" exterior width, and an 86" interior ceiling height.
• Multi-Door Accessibility: Unlike standard boxes that only feature a rear opening, your model includes two side service doors in addition to the rear roll-up door. This allows workers to easily load/unload smaller packages from curbside without opening the large rear door, making it perfect for multi-stop city delivery routes.
• Interior Construction: It traditionally features premium, durable hardwood flooring laid over heavy-gauge steel crossmembers, along with integrated interior cargo tie-down rails (like E-track) for shifting loads.

Chassis, Tires & Capabilities

• GVWR (14,500 lbs): This rating means the total weight of the truck, fluids, passengers, and cargo combined cannot exceed 14,500 lbs. Because it is under 26,000 lbs, it can be driven without a Commercial Driver's License (CDL) in most regions.
• 4×2 Drivetrain & Suspension: A rear-wheel-drive configuration built with a heavy-duty solid I-beam front axle and a robust dual-rear-wheel drive axle supported by multi-leaf steel springs.
• LT215/85R16 Tires: It runs on heavy-ply commercial Light Truck (LT) tires designed to withstand massive inflation pressures and heavy axle loads.
• Maneuverability: The cab-over-engine design allows the truck to have an extremely sharp turning radius—often tighter than a standard pickup truck—making it highly nimble in tight urban alleyways. 

Some possible reasons for the low power problem?

1. Fuel Delivery Issues (Most Common)

The high-pressure common rail system on the 4HK1-TC is highly sensitive to pressure drops. Uphill driving demands higher fuel rail pressure, making this a prime suspect. 

• Suction Control Valve (SCV): This valve on the high-pressure pump frequently sticks or fails internally on Isuzu trucks. A sticking SCV causes intermittent low rail pressure before failing permanently. 
• Hidden Banjo Bolt Filter Screen: Beyond the standard fuel filters, there is a tiny, easily overlooked filter screen inside the banjo bolt at the supply pump inlet. It frequently clogs with fuel tank debris, starving the engine under load.
• Primer Pump Air Leaks: The hand primer pump assembly on top of the main fuel filter housing can crack or draw in air. If air enters the lines, the fuel rail cannot maintain proper pressure. 

2. Exhaust & Emissions System Restrictions

A 2014 model relies heavily on a complex Diesel Particulate Defuser (DPD/DPF) and Selective Catalytic Reduction (SCR/DEF) system.

• Clogged DPF / DPD: If the exhaust filter is overloaded with soot and fails to complete a regeneration cycle, it creates massive backpressure. The ECM will force a heavy derate to prevent engine suffocation. 
• DEF System Faults: A failed Diesel Exhaust Fluid (DEF) pump, clogged DEF injector, or a bad NOx sensor will instantly command a permanent 30–40 mph derate. This is often accompanied by an amber blinking DEF light or a red exhaust warning light. 

3. Turbocharger and Intake Failures

The 4HK1-TC uses a Variable Geometry Turbocharger (VGT) to control boost pressure across different RPM ranges.

• Stuck VGT Vanes / Actuator: The electronic actuator or internal turbo vanes can become locked in place by carbon buildup. If they stick in a low-boost position, the truck will completely lack the power required to pull hills.
• Mass Air Flow (MAF) / MAP Sensor Soot: A heavily contaminated MAF or manifold pressure sensor will send incorrect data to the ECM, causing it to under-fuel the engine to prevent black smoke.
   
  4. Injection Pump Wiring Harness Pigtail

• Intermittent Circuit Break: The factory wiring harness pigtail connecting to the high-pressure fuel pump is a known failure point on Isuzu 5.2L engines. Constant engine vibration fractures the copper strands inside the insulation. This causes an unstable electrical signal that initially triggers an intermittent limp mode before breaking permanently.

Terms of Sale:
All sales are final. No refunds will be issued. This item is being sold as is, where is, with no warranty, expressed written or implied. The seller shall not be responsible for the correct description, authenticity, genuineness, or defects herein, and makes no warranty in connection therewith. No allowance or set aside will be made on account of any incorrectness, imperfection, defect or damage. Any descriptions or representations are for identification purposes only and are not to be construed as a warranty of any type. It is the responsibility of the buyer to have thoroughly inspected this item and to have satisfied himself or herself as to the condition and value and to bid based upon that judgment solely. The seller shall and will make every reasonable effort to disclose any known defects associated with this item at the buyer request prior to the close of sale. Seller assumes no responsibility for any repairs regardless of any oral statements about the item. Seller is NOT responsible for providing tools or heavy equipment to aid in removal. Items left on seller premises after this removal deadline will revert back to possession of the seller, with no refund.