The Ford Bronco IV 4.9L, produced between 1987 and 1991, represented a continuation of the popular Bronco line, offering a blend of off-road capability and on-road comfort. This variant, equipped with the 4.9-liter inline-six engine and a four-speed automatic transmission, occupied a middle ground in the Bronco IV lineup, positioned between the base models with smaller engines and the more performance-oriented options. It was primarily marketed towards buyers seeking a capable and reliable SUV for both daily driving and recreational use, particularly in regions where all-wheel drive was valued.
Technical Specifications
| Brand | Ford |
| Model | Bronco |
| Generation | Bronco IV |
| Type (Engine) | 4.9 (147 Hp) AWD Automatic |
| Start of production | 1987 |
| End of production | 1991 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 3 |
| Fuel consumption (economy) – urban | 16.8 l/100 km (14 US mpg, 16.8 UK mpg, 6 km/l) |
| Fuel consumption (economy) – extra urban | 13.8 l/100 km (17 US mpg, 20.5 UK mpg, 7.2 km/l) |
| Fuel consumption (economy) – combined | 15.7 l/100 km (15 US mpg, 18 UK mpg, 6.4 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Power | 147 Hp @ 3400 rpm |
| Power per litre | 29.9 Hp/l |
| Torque | 360 Nm @ 2000 rpm (265.52 lb.-ft. @ 2000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine displacement | 4917 cm3 (300.05 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 101.6 mm (4 in.) |
| Piston Stroke | 101.09 mm (3.98 in.) |
| Compression ratio | 8.8:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 5.7 l (6.02 US qt | 5.02 UK qt) |
| Coolant | 13 l (13.74 US qt | 11.44 UK qt) |
| Max. weight | 1985 kg (4376.18 lbs.) |
| Fuel tank capacity | 121 l (31.96 US gal | 26.62 UK gal) |
| Length | 4585 mm (180.51 in.) |
| Width | 2009 mm (79.09 in.) |
| Height | 1892 mm (74.49 in.) |
| Wheelbase | 2659 mm (104.69 in.) |
| Front track | 1654 mm (65.12 in.) |
| Rear (Back) track | 1636 mm (64.41 in.) |
| Drag coefficient (Cd) | 0.60 |
| Minimum turning circle (turning diameter) | 11.13 m (36.52 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 4 gears, automatic transmission |
| Front brakes | Disc |
| Rear brakes | Drum |
| Assisting systems | ABS (Anti-lock braking system) |
| Tires size | 235/75 R15 |
| Wheel rims size | 15 |
Powertrain & Engine Architecture
The heart of the Bronco IV 4.9L was the 4.9-liter (300 cubic inch) inline-six engine. This engine, a Ford stalwart, had been in production for decades and was known for its durability and relatively simple design. It featured a cast iron block and cylinder head, a two-barrel carburetor (later models transitioned to multi-port fuel injection as noted in the specifications), and a single overhead camshaft operating two valves per cylinder. The engine’s relatively low compression ratio of 8.8:1 contributed to its ability to run on lower octane fuel, a practical consideration for many owners. The four-speed automatic transmission, typically a Ford C6, was chosen for its robustness and ability to handle the engine’s torque. While not known for its quick shifts, the C6 provided smooth and reliable operation.
Driving Characteristics
The 147 horsepower and 265 lb-ft of torque delivered by the 4.9L engine, coupled with the automatic transmission, resulted in a driving experience that prioritized usability over outright performance. Acceleration was adequate for everyday driving, but the Bronco IV 4.9L wasn’t a particularly quick vehicle. The automatic transmission’s gear ratios were geared towards providing sufficient power for towing and off-road situations, rather than maximizing acceleration. Compared to the five-speed manual transmission option, the automatic version felt noticeably slower, especially when merging onto highways or climbing steep hills. However, the automatic offered a more relaxed driving experience, particularly in urban environments.
Equipment & Trim Levels
The Bronco IV 4.9L Automatic typically came standard with features such as air conditioning, a basic AM/FM radio, and cloth upholstery. Power steering and power brakes were also common inclusions. Higher trim levels offered options like upgraded sound systems, cruise control, and more luxurious interior appointments. The exterior often featured color-matched wheel flares and a chrome front bumper. The interior design was functional and utilitarian, reflecting the Bronco’s intended purpose as a rugged and capable vehicle.
Chassis & Braking
The Bronco IV utilized a body-on-frame construction, providing a robust and durable platform for off-road use. The suspension consisted of a solid front axle with coil springs and a solid rear axle with leaf springs. This setup provided good articulation for navigating rough terrain, but the ride quality on paved roads could be somewhat bumpy. The braking system featured disc brakes on the front wheels and drum brakes on the rear. While adequate for most driving conditions, the rear drum brakes were a limitation compared to the all-disc setups found on some competing SUVs. An anti-lock braking system (ABS) was available as an option, enhancing safety and control during emergency braking situations.
Market Reception & Comparison
The Bronco IV 4.9L Automatic was generally well-received by consumers and automotive critics alike. It was praised for its reliability, off-road capability, and comfortable interior. However, its fuel economy was a common criticism, with the 4.9L engine consuming a significant amount of gasoline. Compared to the smaller-engined Broncos, the 4.9L offered more power and torque, making it a better choice for towing and hauling. Compared to the higher-performance V6 options, the 4.9L provided a more balanced combination of performance and fuel efficiency. The automatic transmission was seen as a convenient option for drivers who preferred a more relaxed driving experience, but it came at the expense of some performance.
Legacy
The Ford Bronco IV 4.9L Automatic has become a popular choice among classic SUV enthusiasts. The 4.9L inline-six engine is known for its longevity and relatively simple maintenance requirements. Parts availability remains good, making it relatively easy to keep these vehicles on the road. While fuel economy is a concern by modern standards, the Bronco IV 4.9L continues to be valued for its ruggedness, reliability, and iconic styling. In the used car market, well-maintained examples command a premium, reflecting the growing demand for classic Ford Broncos.
