Isuzu›Trooper›1991›Overview/isuzu/trooper/1991/base/

1991 Isuzu Trooper

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1991 Trooper.

Body SUV

The 1991 Isuzu Trooper is an SUV situated within a model generation spanning from 1990 to 2002, distinguished by three recalls and 61 total owner complaints that focus primarily on the engine and engine cooling area. This specific complaint volume positions the 1991 model year above the generation's minimum of 12 incidents seen in 2002, though it remains below the peak of 81 complaints recorded for the 1999 variant. For researchers, this placement indicates a reliability profile skewed toward higher complaint frequencies within the model's history, necessitating close attention to cooling system components despite the year not representing the absolute maximum risk.

Model year2002 2001 1995 1994 1993 1992 1991 1990 1989

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length	176 in
Overall width	65 in
Overall height	71.7 in
Wheelbase	104.3 in
Curb weight	3620 lb

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine GM Part No. 12377967 brake fluid.

Lubricants & capacities

Brake Fluid	GM Part No. 12377967
Engine Coolant	ETHYLENE GLYCOL
Power Steering Fluid	ATF
Transfer Case Fluid	5W-30
Transfer Case Fluid Capacity	3.2 Pints

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter at 7,500 mi.

At 7,500 mi	Driveshaft Flange Yoke (torque) · Engine Oil Filter (replace) · Universal Vehicle Operation (inspect idle speed)
Every 7,500 mi	Battery (inspect electrolyte level) · Body Latches, Locks & Hinges (inspect) · Brake Hydraulic System (inspect fluid level) · Brake Line (inspect) · CV Joint Boot (inspect) · Clutch Assembly (inspect)
At 15,000 mi	Drive Axle Assembly (drain & refill) · Transfer Case Assembly (drain & refill) · Transmission Assembly (drain & refill)
Every 15,000 mi	Brake Linings (inspect) · Brake Pedal Assembly (inspect) · Clutch Pedal Assembly (inspect) · Cruise Control System (inspect) · Driveshaft Flange Yoke (torque) · Engine Oil Filter (replace)
Every 30,000 mi	Accessory Drive Belt (inspect) · Clutch Hydraulic Line (inspect) · Drive Axle Assembly (drain & refill) · Engine Air Filter Element (replace) · Engine Air Filter Housing (clean) · Engine Breather Filter (replace)
At 60,000 mi	Drive Axle Assembly (drain & refill) · Transfer Case Assembly (drain & refill) · Transmission Assembly (drain & refill)
Every 60,000 mi	Air Conditioning Condenser (inspect) · Fuel Line (inspect) · Fuel Tank (inspect) · Fuel Tank Filler Cap (inspect) · Ignition Timing (inspect) · PCV System (inspect)
Every 90,000 mi	Oxygen Sensor (replace)
At 120,000 mi	Universal Vehicle Operation (inspect idle speed)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

The 1991 Isuzu Trooper marks a notable spike in federal complaints (61) compared to 1990 (34) and a subsequent drop in 1992 (29), suggesting a mid-cycle quality hiccup rather than a worsening trend. Recalls remained stable at three—consistent with 1990—while investigations declined slightly from seven to six, indicating that while complaints surged, regulators did not escalate scrutiny proportionally. The data reveals a concentration of issues in engine/cooling and powertrain systems (12 complaints each), alongside elevated fire-related complaints (16), which stand out relative to adjacent years. This year falls in the early phase of the generation’s complaint arc, where problems appear more pronounced before later years see fluctuating but generally lower complaint volumes. The lack of a clear root cause in the data limits definitive conclusions, but the 1991 model’s elevated complaints—particularly for fire and powertrain risks—warrant thorough pre-purchase inspection. **Takeaway: Proceed with caution; prioritize a detailed mechanical evaluation, especially of the engine, cooling, and electrical systems, to mitigate potential risks.**

Open recalls

NHTSA campaigns

Service bulletins

Manufacturer communications

ODI investigations

Office of Defects Investigation

Owner complaints

5 involved a crash · 16 a fire

Owner complaints by model year NHTSA · this generation & adjacent

’90’91’92 ’93 ’94 ’95 ’96 ’97 ’98 ’99 ’00 ’01 ’02

Owner complaints filed with NHTSA, by component

All 61 complaints on record, top 8 components.

Engine & Engine Cooling12

Power Train12

Wheels9

Electrical System5

Vehicle Speed Control4

Tires4

Fuel System, Gasoline3

Seat Belts2

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 3 campaigns on record for this vehicle.

93E023000Trailer HitchesReported 22/07/1993

THE WELD ON THE RECEIVER UNIT OF THE TRAILER HITCH CAN BREAK. Remedy: REPLACE THE TRAILER HITCH.

90V167000Power Train:Automatic TransmissionReported 20/09/1990

PUTTING IN MORE TRANSMISSION OIL THAN SPECIFIED CAN CAUSE OIL TO BLEED THROUGH AIR GROOVE ON TO THE EXHAUST MANIFOLD IF OIL TEMPERATURE RISES. Remedy: REPLACE OIL LEVEL GAUGE AND NOTIFY OWNERS TO USE ONLY THE SPECIFIED AMOUNT OF AUTOMATIC TRANSMISSION FLUID.

Technical service bulletins NHTSA · verified

Showing 5 of 5 bulletins on record with NHTSA.

Bulletin	Date	Component	Summary
IB13-R-001G	2023-05-08	Unknown Or Other	This bulletin outlines the procedures for using the Alpine Exchange Program (the…
WB08-X-001I	2023-05-03	Equipment	This bulletin provides instructions with regard to the Isuzu Commercial Vehicle (CV)…
WB13-X-001B	2022-08-30	Equipment	Isuzu Commercial Truck of America, Inc. (ICTA) is providing the following procedural…
WB13-X-001A	2022-08-02	Equipment	Isuzu Commercial Truck of America, Inc. (ICTA) is providing the following procedural…
SB0012S002	2000-03-01	Equipment	THIS TECHNICAL SERVICE BULLETIN OUTLINES THE DETAILED PROCEDURES FOR THE AIR CONDITIONING…

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420

Catalyst system efficiency below threshold — Bank 1

P0300

Random / multiple cylinder misfire detected

P0171

System too lean — Bank 1

P0455

Evaporative emission system leak detected — large leak

P0128

Coolant thermostat below regulating temperature

P0442

Evaporative emission system leak detected — small leak

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN

Decode a VIN to confirm the transmission and build data for a specific Trooper. OEM

Build data

Plant, GVWR class, engine and body data for any 17-character VIN.

Recalls

Check open recall campaigns against a specific vehicle by VIN.

Reference guides

Cross-vehicle references for the kinds of data on this page.

Vehicle recalls & TSBs OBD-II trouble codes Maintenance schedules

Frequently asked

Does the 1991 Trooper have open recalls?

NHTSA lists 3 recall campaign(s) for this model year. Check your specific vehicle by VIN.