🔧 Highlander - Starter Motor Replacement

On your Highlander V6, the starter sits under the upper intake manifold (the top “plenum”), so the job is mostly careful removal and reinstallation of intake parts to access the starter. The key is staying organized with connectors/hoses and replacing the intake gaskets so you don’t create vacuum leaks.

Difficulty Level: Advanced | Estimated Time: 3-5 hours

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⚠️ Safety & Precautions

• ⚠️ Disconnect the negative battery cable first to prevent a short at the starter power wire.
• ⚠️ Work on a fully cool engine; the intake and coolant lines can burn you.
• ⚠️ Keep dirt out of the intake ports; stuff clean shop towels into openings as soon as the manifold is off.
• ⚠️ Do not pull on wiring; release connector locks before unplugging.
• ⚠️ Battery disconnect is required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 14mm socket
• 3/8" ratchet
• 6" extension
• 12" extension
• 3/8" universal joint adapter
• Torque wrench (10–80 Nm range)
• Phillips screwdriver
• Trim clip removal tool
• Hose clamp pliers
• Needle-nose pliers
• Pick tool
• Magnetic pickup tool
• Drain pan (at least 2-gallon)
• Funnel
• Shop towels
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Starter motor - Qty: 1
• Upper intake manifold gasket set - Qty: 1
• Throttle body gasket - Qty: 1
• Toyota Super Long Life coolant (pink) - Qty: 1-2 quarts
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the hood and let the engine cool completely.
• Use a 10mm socket to disconnect the negative battery terminal and isolate it so it can’t spring back. Prevents accidental shorting.
• Lay out a “parts tray” area and label hoses/connectors with tape as you go. This job has many connectors.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover and intake duct

• Pull upward to remove the plastic engine cover (no tools on most covers).
• Use a Phillips screwdriver to loosen the intake hose clamps.
• Unplug the mass air flow sensor connector by releasing the lock tab, then pull straight off.
• Remove the air duct/air box top as needed to create working room (use a 10mm socket for any bolts).

Step 2: Remove the throttle body (set it aside)

• Unplug the throttle body electrical connector (press the lock, then pull).
• Use hose clamp pliers to slide the coolant hose clamps back (if equipped with throttle-body coolant lines).
• Carefully twist and remove the small coolant hoses; catch any coolant with a drain pan.
• Use a 10mm socket to remove the throttle body mounting bolts.
• Remove the throttle body and the old gasket. Plan to install a new gasket during reassembly.
• Universal joint adapter helps tight bolts.

Step 3: Disconnect vacuum/EVAP/PCV hoses and connectors on the upper intake

• Use needle-nose pliers or hose clamp pliers to release spring clamps on hoses.
• Disconnect the PCV hose, EVAP hose, and any vacuum lines from the upper intake manifold.
• Unplug any intake-related connectors that are attached to the upper intake (press tab, pull straight).
• Use a trim clip removal tool to pop any wire-harness clips from the manifold.

Step 4: Remove the upper intake manifold (plenum)

• Use a 12mm socket with extensions to remove the upper intake manifold bolts/nuts.
• Lift the upper intake manifold straight up and out. If it feels stuck, gently rock it—do not pry on plastic parts.
• Immediately stuff clean shop towels into the exposed intake ports so nothing falls in.
• Remove the old intake manifold gaskets and keep the sealing surfaces clean and dry.
• Torque to 21 Nm (15 ft-lbs) during reassembly.

Step 5: Access the starter and disconnect its wiring

• Locate the starter in the valley area beneath where the upper intake sat.
• Unplug the starter solenoid connector (small connector) by pressing the tab.
• Use a 12mm socket to remove the nut for the main power cable on the starter terminal.
• Pull the power cable off and move it aside. Add a small dab of dielectric grease to the boot during reassembly.

Step 6: Remove the starter motor

• Use a 14mm socket with a 6" extension to remove the starter mounting bolts.
• Lift the starter out carefully (a magnetic pickup tool helps if you drop a bolt).

Step 7: Install the new starter motor

• Position the new starter and start both mounting bolts by hand to prevent cross-threading.
• Use a 14mm socket to tighten the mounting bolts.
• Torque to 39 Nm (29 ft-lbs).
• Reconnect the main power cable and tighten the nut with a 12mm socket.
• Torque to 9 Nm (80 in-lbs).
• Reconnect the starter solenoid connector until it clicks.

Step 8: Reinstall the upper intake manifold with new gaskets

• Remove the shop towels from the intake ports.
• Install the new upper intake manifold gaskets in their grooves.
• Set the upper intake manifold in place without pinching any wiring or hoses.
• Use a 12mm socket to install bolts/nuts finger-tight, then snug evenly in a crisscross pattern.
• Torque to 21 Nm (15 ft-lbs).

Step 9: Reinstall the throttle body and intake ducting

• Install a new throttle body gasket.
• Use a 10mm socket to reinstall the throttle body bolts.
• Torque to 10 Nm (89 in-lbs).
• Reconnect coolant hoses (if removed) using hose clamp pliers to reposition clamps.
• Plug in the throttle body connector.
• Reinstall the intake ducting and tighten clamps with a Phillips screwdriver.
• Reconnect the mass air flow sensor connector.

Step 10: Refill coolant (only if you lost any) and reconnect the battery

• Top off the coolant reservoir with Toyota Super Long Life coolant using a funnel.
• Use a 10mm socket to reconnect the negative battery terminal.
• Torque to 5 Nm (44 in-lbs).

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✅ After Repair

• Start the engine and confirm it cranks normally (fast, strong crank).
• Let it idle and listen for hissing (a vacuum leak) around the upper intake.
• Check for coolant leaks at the throttle body hoses (if removed).
• Expect a slightly rough idle for a minute or two after battery reconnect; it should smooth out as the throttle relearns.
• If the check engine light comes on, you’ll likely need to scan for codes (often a missed connector or vacuum hose).

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💰 DIY vs Shop Cost

Shop Cost: $900-$1,400 (parts + labor)

DIY Cost: $250-$550 (parts only)

You Save: $650-$850 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 3-5 hours.

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