1986-1987 Toyota 4Runner Intake Manifold: Decoding 22RE, 22REC, and Turbo Versions

Key Differences for 1986-1987 4Runner Intake Manifolds

For the 1986-1987 Toyota 4Runner, identifying your specific engine is the most critical step before buying an intake manifold. Using the wrong one will lead to installation problems, vacuum leaks, and poor engine performance. These trucks came with three main engine variants, each with a unique intake manifold setup.

Variant Identification: 22RE vs. 22REC vs. 22R-TE

• 22RE (Standard Fuel Injection): This is the most common engine. It uses a two-piece aluminum intake manifold. The upper plenum is a large chamber that the throttle body bolts to, and the lower runners connect the plenum to the cylinder head.
• 22REC (California Emissions): This version looks very similar to the standard 22RE but includes additional ports and passages for emissions equipment, primarily the Exhaust Gas Recirculation (EGR) system. If your truck was originally sold in California, it likely has a 22REC. Swapping a standard 22RE manifold onto a 22REC engine (or vice-versa) will result in missing vacuum connections and check engine lights.
• 22R-TE (Turbo): Produced from 1986 to 1988, this factory turbocharged engine is rare. Its intake manifold is completely different from the non-turbo versions. It is designed to handle boost pressure, features a different throttle body location, and has unique runner geometry. A manifold from a 22RE or 22REC will not fit a 22R-TE engine.

Symptoms of a Failing Intake Manifold or Gasket

The cast aluminum intake manifold on the 22RE is very durable. Failures are almost always related to the gaskets that seal the manifold to the cylinder head, or the gasket between the upper and lower sections. A warped or cracked manifold is less common but possible.

1. Vacuum Leaks

This is the most common symptom. Unmetered air enters the engine, disrupting the air-fuel ratio. Signs include:

• High or Unstable Idle: The engine may idle much higher than normal, or the idle may surge up and down.
• Hissing Noise: A distinct hissing or whistling sound from the engine bay at idle is a classic sign of a vacuum leak.
• Poor Performance: Hesitation during acceleration, stalling at low speeds, and reduced power can all be caused by a vacuum leak.

2. Coolant Leaks

The 22RE intake manifold has passages for engine coolant. A failed gasket can allow coolant to escape.

• External Leak: You may see coolant dripping down the side of the engine block, often originating from the seam where the intake manifold meets the head.
• Engine Overheating: A significant coolant leak will cause the engine to run hot and eventually overheat.
• White Exhaust Smoke: In severe cases, a gasket can fail internally, allowing coolant to be drawn into the cylinders and burned, producing sweet-smelling white smoke from the exhaust.

3. Check Engine Light

On these early fuel-injected trucks, a significant vacuum leak will throw off the sensors and can trigger a check engine light. The system is OBD-I, so you will need to use the jumper wire method in the diagnostic port to flash the codes via the check engine light on the dash.

Buying a Used Intake Manifold: What to Check

Since new OEM manifolds are generally unavailable and quality aftermarket options are non-existent, a good used OEM part is the best choice. Pay close attention to the following before buying.

1. Verify Compatibility

First and foremost, ensure the manifold is from the correct engine (22RE, 22REC, or 22R-TE) and year range. Manifolds from 1983-1988 differ slightly from 1989-1995 models, primarily in how the Idle Air Control Valve (IACV) mounts. For a 1986-1987 4Runner, you need a manifold from the earlier group.

2. Physical Inspection

• Check for Warping: Lay a straight edge or ruler across all machined mating surfaces, especially the large surface that meets the cylinder head. There should be no visible gaps. A warped manifold will never seal properly, even with a new gasket.
• Inspect for Cracks: Carefully check for hairline cracks, especially around bolt holes and in the runners.
• Check Threaded Holes: Make sure all threaded holes are clean and not stripped. Pay special attention to the holes for the throttle body, fuel rail, and cold start injector. A stripped cold start injector bolt hole is a known issue that causes a vacuum leak.
• Look for Corrosion: Check inside the coolant passages for heavy corrosion or pitting, which can compromise the gasket's ability to seal.
• Get Both Halves: The 22RE intake is a two-piece design. Ensure you are getting both the upper plenum and the lower runners, as they are a matched set.

Cost Comparison for Intake Manifold Service

The cost is primarily driven by labor, as the gaskets themselves are inexpensive. If the manifold itself is damaged, a used part is the most common solution.

Replacement Overview

• Difficulty: 4 out of 5. This is an advanced DIY job due to the number of systems involved.
• Key Steps: The process involves draining the cooling system, depressurizing and disconnecting the fuel system, removing the throttle body, labeling and disconnecting numerous vacuum hoses and electrical connectors, and unbolting the upper and lower manifold sections.
• Crucial Task: Meticulously cleaning the old gasket material from the cylinder head and manifold surfaces is essential for a good seal. Use a plastic scraper or razor blade carefully to avoid gouging the aluminum surfaces.
• Torque Specs: The nuts and bolts holding the intake manifold to the cylinder head should be torqued to 14 ft-lbs. Do not overtighten, as this can warp the manifold or damage the threads.

Frequently Asked Questions (FAQ)

Recalls and Technical Service Bulletins (TSBs)

As of this writing, there are no specific NHTSA recalls or widespread TSBs for the intake manifold on the 1986-1987 Toyota 4Runner. Most issues are related to age and the service life of the gaskets.