🔧 Impala - Starter Motor Replacement

Your starter motor cranks the engine when you turn the key/push the button. Replacing it means disconnecting the battery, unplugging the starter wiring, unbolting the starter, then installing the new one and verifying the engine cranks normally.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

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⚠️ Safety & Precautions

• ⚠️ Disconnect the battery negative cable before touching starter wiring (starter cable is always “hot”).
• ⚠️ Support your Impala with jack stands on solid level ground; never rely on a jack alone.
• ⚠️ Let the exhaust cool fully if you’ll work near it.
• ⚠️ Keep keys/fob away from the car so it can’t crank accidentally.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Mechanic gloves
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• 10mm socket
• 13mm socket
• 15mm socket
• 7mm socket
• 3/8" drive ratchet
• 3/8" drive extension set
• 3/8" drive swivel universal joint
• Trim clip remover
• Flathead screwdriver
• Torque wrench (10–100 ft-lbs range)
• Torque wrench (in-lb range)
• Battery terminal puller (specialty)
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Starter motor - Qty: 1
• Intake manifold gasket set - Qty: 1 (only if your starter is under the intake)
• Throttle body gasket - Qty: 1 (only if removed)
• Dielectric grease - Qty: 1 (optional)

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📋 Before You Begin

• Park on level ground, shift to Park, set the parking brake, and chock the rear wheels.
• Open the hood and use a 10mm socket to disconnect the battery negative cable, then isolate it so it can’t spring back.
• Identify starter location on your Impala:
  • If you can see the starter from underneath near the transmission bellhousing, follow the “From-Underneath Access” steps.
  • If the starter is buried in the “V” of the engine under the intake manifold, follow the “Under-Intake Access” steps.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect the battery

• Use a 10mm socket to remove the negative (-) battery cable from the battery terminal.
• Set cable aside so it can’t touch.

Step 2: Raise and support the front of the car (if accessing from below)

• Use a floor jack (rated 3-ton minimum) to lift the front.
• Place jack stands (rated 3-ton minimum) under the proper front lift/support points.
• Use wheel chocks at the rear wheels.

Step 3: Remove the lower splash shield (From-Underneath Access)

• Use a 7mm socket and 3/8" drive ratchet to remove the fasteners.
• Use a trim clip remover for any plastic push clips.

Step 4: Locate the starter and label the wires

• Use a flashlight to locate the starter motor and solenoid.
• Use a flathead screwdriver to release any electrical connector locks (don’t force them).
• Take a quick photo before disconnecting.

Step 5: Disconnect starter electrical connections

• Unplug the small solenoid connector by hand; use a flathead screwdriver only to release the lock tab if needed.
• Use a 13mm socket with a 3/8" drive ratchet to remove the nut for the main battery cable on the starter (big cable).
• Move the cable aside so it can’t contact metal.
• Torque on install: Torque to 10 Nm (89 in-lbs) for the solenoid main terminal nut.

Step 6: Remove the starter mounting bolts

• Use a 15mm socket, 3/8" drive ratchet, and 3/8" drive extension set (and swivel universal joint if needed) to remove the starter mounting bolts.
• Support the starter with your free hand as the last bolt comes out.
• Torque on install: Torque to 50 Nm (37 ft-lbs) for starter mounting bolts.

Step 7: Remove the starter from the vehicle

• Wiggle the starter out carefully; rotate it as needed to clear nearby components.
• If it won’t come out, re-check for hidden fasteners or wiring still attached.

Step 8: Install the new starter

• Position the new starter in place by hand.
• Start the mounting bolts by hand first to avoid cross-threading.
• Use a 15mm socket and 3/8" drive ratchet to snug bolts, then use a torque wrench (10–100 ft-lbs range) to finish.
• Torque: Torque to 50 Nm (37 ft-lbs).

Step 9: Reconnect starter wiring

• Reconnect the main battery cable and tighten with a 13mm socket, then use a torque wrench (in-lb range).
• Torque: Torque to 10 Nm (89 in-lbs).
• Plug in the small solenoid connector until it clicks.
• A dab of dielectric grease helps corrosion.

Step 10: Reinstall splash shield and lower the car (From-Underneath Access)

• Reinstall the shield using a 7mm socket and 3/8" drive ratchet, and any clips with a trim clip remover.
• Lower your Impala safely using the floor jack (rated 3-ton minimum).

Step 11: Under-Intake Access (only if your starter is under the intake manifold)

• This path requires removing the intake manifold (the large air/plastic assembly on top of the engine). “Intake manifold” means the air passages feeding the engine; it seals with gaskets that should be replaced once removed.
• Before unbolting anything, confirm you have intake manifold gasket set and (if removed) a throttle body gasket.
• If you confirm your starter is under the intake, tell me what you see on top of the engine (one photo helps), and I’ll give you the exact under-intake removal/reinstall sequence for your Impala.

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✅ After Repair

• Reconnect the battery negative cable using a 10mm socket.
• Start the engine and verify it cranks strongly with no clicking/grinding.
• Check that no warning lights appear and that the starter wiring is not rubbing on anything.
• Re-check for any loose fasteners after a short test drive.

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💰 DIY vs Shop Cost

Shop Cost: $450-$900 (parts + labor)

DIY Cost: $150-$450 (parts only)

You Save: $300-$450 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3.0 hours.

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🎯 Ready to get started?

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