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Toyota Corolla Spark Plugs Replacement Guide
How to change the engine spark plugs in an 11th generation 2014-2018 Toyota Corolla with the 2ZR-FE 1.8L I4 motor.

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2014 Corolla 1.8L I4
Pull Off Plastic Engine Cover
Engine Cover Removed
This automotive maintenance tutorial was specifically written to assist owners of the eleventh generation (2014, 2015, 2016, 2017 and 2018) Toyota Corolla in checking or changing the engine spark plugs in the 2ZR-FE 1.8 liter inline four cylinder motor.

Owners of other Toyota, Lexus or Scion vehicles such as the Yaris, Matrix, Prius, Camry, RAV4, Sienna, Tacoma, Tundra, FJ Cruiser, Venza, Highlander, Avalon, Sequoia, Land Cruiser, IS 250, ES 350, GS 350, tC, xB, xD, iQ and FR-S may also find these DIY instructions to be helpful.

The OEM spark plugs in this 2014 Corolla are Denso part number SC20HR11 (3444) Iridium.

A few compatible replacement spark plugs with their part numbers are as follows: NGK (4912) ILKAR7B11, Pulstar GG1H10, Bosch (9621) VR7NII33X, Toyota 90919-01253, Autolite XP5683 Iridium or Autolite APP5683.

The tools needed to complete this procedure include a flathead screwdriver, a 14mm spark plug socket or a 9/16" spark plug socket, an extension bar, a 3/8" drive ratcheting wrench and a tube of dielectric grease.

2ZR-FE 1.8L I4 Engine
Four Ignition Coil Modules
Ignition Coil & Plug
The first two steps are to open the hood and gently pull off the plastic engine cover.

Set the plastic engine cover aside in a safe place.

If the car been driven recently, I'd recommend allowing the engine to cool off for at least an hour or two to prevent from burning your fingers or hands.

Press In Release Tab
Pull Off Electrical Connector
Power Plug Removed
If you have access to compressed air or a wet/dry shop vacuum, thoroughly clean off the top of the engine to help prevent from having debris fall down in to the spark plug well.

Press in the release tab on the black plastic electrical connector before sliding it off the end of the ignition coil housing.

If the release tab is to stiff to push in with your fingers, use a flathead screwdriver to push it down.

Loosen Counterclockwise
10mm Bolt Removed
Rotate Ignition Coil
I'd recommend only checking or changing one spark plug at a time to reduce the risk of having a foreign object drop down in to the cylinder.

Loosen the single bolt that holds the ignition coil housing in place by turning it counterclockwise with a 10mm socket and 1/4" drive ratcheting wrench.

Set the 10mm bolt aside in a safe place.

Rotate the ignition coil back and forth a few times to make sure that the rubber dust boot at the end is not stuck or "frozen" to the top of the old spark plug.

Lift Out Ignition Coil
Spark Plug Well
9/16" Spark Plug Socket
Lift the ignition coil straight out of the spark plug well and set it aside in a safe place.

Attach the 14mm spark plug socket or a 9/16" spark plug socket) to the extension bar and the 3/8" drive ratcheting wrench.

I personally used a 6 point 9/16" spark plug socket.


Loosen Counterclockwise
Spin Out Old Spark Plug
Lift Out Old Spark Plug
Lower the 9/16" socket down on to the top of the old spark plug. (Your spark plug socket should have a rubber insert or a strong magnet to hold the old spark plug in place.)

Loosen the old spark plug by turning it counterclockwise. Try to avoid using excessive force.

If the spark plug won't turn, spray in some penetrating oil such as PB Blaster, Liquid Wrench or Kano Kroil and wait 15-30 minutes or more before trying again. If you don't have any penetrating oil, try spraying some WD-40 or just warm up the engine for a few minutes to expand the metal engine block.

Once the spark plug is loose, detach the ratcheting wrench.

Continue spinning out the old spark plug with your finger tips on the extension bar.

Carefully lift the old spark plug out of the well.

Old Spark Plug Removed
Lower In New Spark Plug
Tighten Clockwise
Pull the old spark plug out of the socket and inspect it.

If the end of the old spark plug looks ashy white, the plugs may have been exposed to high temperatures such as engine overheating or they are the incorrect heat range for your driving conditions and/or environment.

If the old spark plugs are dark grey or covered in black soot, the engine might be burning oil and should be checked by a professional mechanic.

If you have a spark plug gap gauge, check the gap on the new spark plugs. They should already be pre-gapped to the correct setting from the factory. The box should list the correct specifications.

The OEM spark plugs are Denso SC20HR11 iridium which should last up to 100,000 miles. The OEM Denso plugs should be gapped to .044" from the factory.

Push the new spark plug in to the socket and lower it down in to the well.

Spin in the spark plug by hand a few turns in the clockwise direction to prevent it from becoming cross threaded.

Attach the 3/8" drive ratcheting wrench to the extension bar and tighten the new spark plug in the clockwise direction to just a tiny bit past the point when you feel the crush washer collapse.

If you are re-installing the old spark plugs, tighten them to just a small fraction of a turn past hand tight.

Try to avoid using excessive force to prevent from cracking the new spark plug or stripping the aluminum threads.

Apply Dielectric Grease
Lower In Ignition Coil
Rotate - Spread Grease
Apply a small amount of dielectric grease to the rubber dust boot at the bottom of the ignition coil.

The dielectric grease will help prevent corrosion and help keep out any moisture or debris.

Lower the ignition coil down in to the spark plug well.

Rotate the ignition coil back and forth a few times to help spread the dielectric grease.

Spin In 10mm Bolt
Tighten Clockwise
Push On Power Plug
Spin in the 10mm bolt a few turns to prevent it from becoming cross threaded.

Tighten the bolt in the clockwise direction with the 10mm socket and 1/4" drive ratcheting wrench until it is snug.

Try to avoid over tightening the ignition coil bolt to prevent from cracking the plastic housing.

Push the electrical connector straight on to the ignition coil housing until it clicks securely in to place.

Spark Plug Replaced
Push On Plastic Engine Cover
Engine Cover Replaced
Line up the rubber friction fasteners on the underside of the plastic engine cover with the metal mounting pegs on the top of the engine.

Push the plastic engine cover back in to place.

Start the engine and listen closely for any strange sounds that might indicate a problem such as a loose spark plug or disconnected ignition coil power plug.

Be sure to record the spark plug change in your car's service records.

For more, check out my other 2014-2018 Toyota Corolla DIY Repair & Maintenance Guides.

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