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Honda Accord Engine Spark Plugs Replacement Guide
How to check or change the spark plugs in an 8th generation 2008 to 2012 Honda Accord with the 2.4L I4 engine.

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2009 Honda K24Z2 I4
Remove 10mm Bolts
10mm Bolt Removed
This automotive "how-to" guide was specifically written to assist owners of the eighth generation (2008, 2009, 2010, 2011 & 2012) Honda Accord in checking or changing the spark plugs in the K24Z2 or K24Z3 2.4 liter inline four cylinder engines.

Owners of other Honda or Acura vehicles with "K" series motors such as the Civic, CR-V, Integra, RSX, RDX, TSX, Odyssey, and Element may also find these DIY instructions to be helpful.

A few compatible replacement spark plugs include the following with their part numbers: Denso 3461 (SXU22HCR11S), NGK 5787, Pulstar Pulse gg1i, Champion 9407 (RER8ZWYCB4), Bosch (9619) YR6SII330X, Denso (5356) IXUH22I, Honda 12290-R40-A02, and Autolite XP5702.

The tools required to complete this procedure include a 10mm socket with 1/4" drive ratchet, a 5/8" spark plug socket with a 3/8" drive ratchet, a 6" extension bar, dielectric grease and anti-seize lubricant (optional).

Remove Other Front Bolt
Two Screws On Rear
Removing 4th Bolt
Allow the engine to cool down before beginning this procedure to help avoid being burned.

Pop open the hood and locate the rectangular black plastic spark plug access cover on the top of the engine just past the dipstick and oil filler cap.

Remove the four bolts on the cover with the 10mm socket and a 1/4" drive ratchet.

Set the bolts aside in a safe place.

4 Engine Cover Bolts
Lift Off Engine Cover
4 Ignition Coils Exposed
Lift off the engine cover and set it aside in a safe place.

Below the cover, you'll see the four black/grey ignition coils with their power plugs.

Loosen 10mm Bolt
Ignition Coil Bolt Removed
Press Release Tab
If you have access to compressed air or a wet/dry shop vacuum, clean off the top of the engine to help prevent from having a piece of debris fall in to the spark plug well or cylinder head.

Remove the bolt holding the spark plug ignition coil in place with a 10mm socket and ratcheting wrench by turning it counter clockwise. Set the bolt aside in a safe place.

I'd recommend working on one spark plug at a time to further reduce the risk of having something drop down in to the engine.

Slide Off Power Connector
Rotate Ignition Coil
Lift Ignition Coil Out
Press the release button on the power connector and slide it straight off the ignition coil.

Rotate the ignition coil back and forth a few times to ensure that the rubber dust boot at the end of the coil is not stuck to the top of the spark plug.

Lift the ignition coil straight out of the spark plug well.


Loosen Spark Plug
Spin Out Old Spark Plug
Lift Spark Plug Out
Attach the 5/8" spark plug socket to the 6" extension bar and the 3/8" drive ratcheting wrench.

The spark plug socket should have a rubber insert or magnet to securely hold the spark plug.

Carefully lower the spark plug socket down in to the well and attach it to the top of the spark plug.

Gently loosen the old spark plug by turning the wrench counter clockwise.

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 in some WD-40 lubricant 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 from the extension bar and spin out the spark plug the rest of the way by hand.

Carefully lift the old spark plug straight out of the well.

Old Denso # 3461
Lower New Spark Plug
Thread In By Hand
Pull the old spark plug out of the socket and inspect it.

The OEM iridium tipped spark plugs on this 2009 Honda Accord LX Premium sedan are Denso 3461 or "SXU22HCR11S".

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 may be burning oil and should be checked out by a professional.

Tighten New Spark Plug
Apply Dielectric Grease
Rotate Coil - Spread Grease
The new iridium tipped spark plugs should be pre-gapped at 0.044" from the factory. It is still a good idea to check that the gap is correct using a spark plug gap gauge disc. If the gap is not very close to 0.044", exchange the plug for a new one.

An optional step is to apply a tiny amount of anti-seize lubricant to the upper threads of the new spark plug. This will make the plugs easier to remove if they are not replaced again for another 100,000 miles. Do not get any anti-seize on the electrode at the bottom of the new spark plug. Some spark plug manufacturers advise against using anti-seize.

Insert the new spark plug in to the socket and carefully lower it down in to the well without hitting the electrode tip. Spin the new spark plug in by hand in the clockwise direction until it makes contact with the engine block.

Attach the ratcheting wrench to the extension bar and tighten the new spark plug to just barely past the point when you feel the crush washer collapse.

If you applied anti-seize lubricant to the threads, less force will be necessary to tighten the plugs. Do not over tighten the plugs to avoid cracking the ceramic part of the plug or stripping the aluminum threads in the cylinder head.

Double check that the new spark plugs are tight before moving on to the next steps.

Apply a small amount of dielectric grease to the opening of the rubber dust boot at the bottom of the ignition coil.

This will help prevent the ignition coil from becoming stuck to the tip of the new spark plug and keep out any moisture.

Lower the ignition coil down over the tip of the new spark plug and rotate it a few times to spread the dielectric grease.

Slide On Power Plug
Re-Insert 10mm Bolt
Tighten Ignition Coil Bolt
Slide on the power connector until it clicks in to place.

Re-insert the ignition coil bolt and tighten it with the 10mm socket and ratcheting wrench.

Replace Spark Plug Cover
Tighten Four 10mm Bolts
Spark Plugs Replaced
Lower the spark plug cover on to the top of the engine and tighten the four 10mm bolts.

Start up the engine and listen for any strange sounds that may indicate a problem.

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

For more, check out my other 2008-2012 Honda Accord Repair & Maintenance Guides.

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