🔧 Renegade - Spark Plug Replacement

Replacing spark plugs restores strong ignition, smooth idle, and good fuel economy. On your Renegade’s 1.4L turbo, fresh plugs also help prevent misfires under boost.

Difficulty Level: Intermediate | Estimated Time: 1.0-2.0 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a fully cool engine to avoid burns and damaged threads.
• ⚠️ Keep dirt out of the spark plug holes; debris can damage the engine.
• ⚠️ Do not over-tighten spark plugs; the cylinder head is aluminum.
• ⚠️ Battery disconnect is not required, but it’s OK to disconnect the negative cable if you’re worried about accidentally shorting something.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 10mm socket
• 3/8" drive ratchet
• 3/8" drive extension set (3" and 6")
• 5/8" spark plug socket
• Torque wrench (5–60 Nm range)
• Small flat trim tool
• Compressed air blow gun
• Feeler gauge set (0.6–1.2 mm)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs (OEM-spec for 1.4L turbo) - Qty: 4
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park (or 1st gear), and set the parking brake.
• Let the engine cool completely (at least 1 hour after driving).
• Set your tools out in order so nothing falls into the engine bay.
• A torque wrench ensures “not too tight.” (A torque wrench clicks when you reach the correct tightness.)
• A spark plug socket grips the plug safely. (It has a rubber insert to hold the plug.)

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Use a small flat trim tool to gently lift the cover corners if it’s tight.
• Lift the cover straight up and set it aside.

Step 2: Locate the ignition coils

• The 1.4L uses coil packs on top of each spark plug (one per cylinder).
• Work one cylinder at a time so connectors don’t get mixed up.

Step 3: Unplug the coil electrical connector

• Use your fingers first; if needed, use the small flat trim tool to gently release the locking tab.
• Pull on the connector body, not the wires.

Step 4: Remove the coil(s)

• Use a 10mm socket with a 3/8" drive ratchet to remove the coil hold-down bolt(s).
• Twist the coil slightly, then pull straight up to remove it.
• If the coil is stuck, keep twisting gently—don’t pry hard.

Step 5: Clean the spark plug well

• Use a compressed air blow gun to blow out dust around the plug before removing it.
• This prevents grit from falling into the cylinder.

Step 6: Remove the old spark plug

• Use a 5/8" spark plug socket, 3/8" drive extension, and 3/8" drive ratchet to loosen and remove the plug.
• If it feels extremely tight, stop and work it back and forth gently to avoid thread damage.

Step 7: Check and prep the new spark plug

• Use a feeler gauge set (0.6–1.2 mm) to verify the plug gap matches the spec printed on the plug box.
• Do not apply anti-seize unless the plug maker specifically says to; most modern plugs are coated and don’t need it.
• Apply a tiny smear of dielectric grease inside the coil boot (a thin film). Dielectric grease helps prevent moisture and makes future removal easier.

Step 8: Install the new spark plug

• Start the plug by hand using the 5/8" spark plug socket and 3/8" drive extension only (no ratchet at first) to prevent cross-threading.
• Once it seats, use a torque wrench (5–60 Nm range) to tighten: Torque to 23 Nm (17 ft-lbs).
• Hand-threading first is the best “newbie” trick.

Step 9: Reinstall the coil and connector

• Push the coil straight down until it fully seats on the plug.
• Install the coil bolt using the 10mm socket and snug it down (do not over-tighten).
• Reconnect the electrical connector until it clicks/locks.

Step 10: Repeat for the other 3 cylinders

• Repeat Steps 3–9 for each remaining spark plug.

Step 11: Reinstall the engine cover

• Align it and push straight down until it snaps into place.

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✅ After Repair

• Start the engine and let it idle for 1–2 minutes. It should be smooth with no shaking.
• Take a short test drive and check for hesitation under acceleration.
• If you get a flashing check-engine light or misfire, stop driving and recheck coil connectors and plug seating.

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💰 DIY vs Shop Cost

Shop Cost: ₹6,000-₹12,000 (parts + labor)

DIY Cost: ₹2,000-₹6,000 (parts only)

You Save: ₹4,000-₹6,000 by doing it yourself!

Shop labor rates vary but typically run ₹1,500-₹3,500/hour. This repair takes a shop approximately 1.0-1.5 hours.

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🎯 Ready to get started?

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