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The Ford Bronco II, a compact SUV inspired by Ford's pickup truck design, was produced and sold by the renowned American manufacturer between 1984 and 1990. Created to compete with other three-door SUVs entering the market, the Bronco II was assembled at the Louisville Assembly Plant in Kentucky. Benefiting from a design that was nearly a foot shorter than its rivals, the model utilized the pickup's chassis for cost-effective production. Initially, all Bronco II models came with four-wheel drive until 1986, when rear-wheel drive versions with a sealed or capped transfer case were introduced. Airbags were also incorporated for added safety. Under the hood, the 1984 and 1985 models were powered by a German-built, carbureted 2.8 L Cologne V6 engine, generating 115 hp at 4600 rpm. In 1986, Ford introduced a more potent fuel-injected 2.9 L Cologne V6 engine, capable of 140 hp. A Mitsubishi 2.3 L turbodiesel four-cylinder engine was also offered optionally in 1986 and 1987, but it didn't garner much acclaim. The Bronco II, with its 94.0-inch wheelbase, ceased production in February 1990, making way for another light truck model from Ford.

The Ford Bronco II, notably the 1987 and 1988 models fitted with a 2.9L engine, often displays two predominant issues: a rough idle at start and consistent stalling at idle. Upon ignition, there's typically a rough start, with the need to press the accelerator to maintain idle. This RPM fluctuation, moving between 500 to 1000, can lead to stalling, especially when stationary. Despite the replacement of various components like fuel filters, fuel pumps, air filters, O2 sensors, and spark plugs, the rough idle continues. Suggested solutions include checking for error codes (as older models might not always activate the Check Engine Light), inspecting and cleaning the Idle Air Control (IAC) valve, examining the upper intake for dirt accumulation, and scrutinizing the fuel pressure regulator for gasoline presence in the vacuum line or oil, hinting at regulator issues. Further, the Throttle Position Sensor (TPS) should be evaluated for potential anomalies. Some vehicles, even after these interventions, still exhibit idling irregularities, sounding similar to a camshaft by the exhaust, and show a reluctance to rev beyond 3,000 RPM, particularly uphill. Potential solutions for these persistent challenges include assessing the oil pump, verifying computer codes, analyzing sensors like the ICA and MAP, recalibrating the TPS, revisiting ignition timing, and ensuring the exhaust system's clarity. The 1987 model, equipped with a 2.9 V6 fuel-injected engine, often faces a challenge in transitioning from drive to park, causing RPMs to drop, which may result in stalling. These symptoms might be attributed to potential vacuum leaks, with findings of disconnected vacuum hoses providing evidence. If the RPM dip is pronounced when braking, the power brake booster could be the source of the vacuum leak. The IAC valve, central to regulating idle RPMs, is vital in these situations. When functioning correctly, the IAC should ensure a steady startup and consistent RPM, and cleaning or replacing a malfunctioning one can resolve the issue. The 1990 model, despite its 76k original miles, can stall after about 25-30 minutes of operation. The "check engine" light usually comes on around 20 minutes before the stall. This model's base idle is often higher than advised, hovering around 1000-1,100 RPM. The root causes behind this stalling could be a malfunctioning MAP sensor or the ECM. In the case of the 1988 model, stalling can occur either upon startup or when shifted into reverse. Concerns include potential timing misalignments and distinct gasoline odors during refueling, which might indicate obstructions in the fuel line or over-rich fuel conditions. Recommendations encompass checking or replacing parts like the Air Charge Temp Sensor, oxygen sensors, TPS, IACV valve, and coolant temp sensor. A faulty fuel pressure regulator might lead to elevated fuel pressure, producing an exhaust odor, indicative of an over-rich fuel mixture. Addressing timing discrepancies might necessitate disconnecting a jumper near the intake manifold's fuel rail.

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