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FA5 - Spark Plugs on Bryan's 09 Civic Si

So my buddy Bryan asked if we could do change his spark plugs based on his service minder. We were mainly focused on spark plugs and inspection of the suspension bushings, ball joints, tie rods, sway bar end links, and the exhaust system.

We had already changed the brake pads on the last go around. Everything looked proper there. Plenty of pad left, the rotors looked good and, no wobble when braking. The brake lines where clean. The fluid was tan-ish. No change in the level of fluid either. All was right in the braking department.

The bushings on the front and rear control arms looked great. There was only a tiny little crack in the bushing where the front driver's side lower control arm mounts to the frame. The tie rods, end links, sway bar mounts, axle boots, and steering rack bellows were all just fine. The only other noticeable item was the front strut dust covers were coming apart. Nothing I was too concerned about.

Changing the spark plugs

Tools needed:
Socket Wrench
10mm socket
12mm socket
5/8 spark plug socket.
Short Extension
Long Extension
Torque Wrench

Let's do it:
Bryan said that there was plenty of discussion between Denso and NGK plugs for his car. He choose to install the NGK Laser Iridium ones. They are already gaped at .044.

Part number for the plugs.

Love that color blue.

To change the plugs the front cow needed to be removed. There are clips across the section at the windshield. There are two large plastic push clips on the left and right. There are two smaller ones on the inside, beside each of those. One more small one in the middle. I slide my fingers down under the cow near the windshield and pulled up gently. This pops the factory clips loose. Be careful and you will not have any broken clips.

Here you can see the factory clips on the back side of the cowl.

There is one that is different. There is a label on molded to the plastic of the cowl that says, Blue Clip with and arrow. Interesting.

The metal under that cover is held with four bolts on each side. The two in the middle are 12mm and the two on the outside are 10mm. There is one in the middle which is also 10mm.

Bryan getting those bolts loose.

The one 10mm in the middle.

Underside of the cowl.  It has foam insulation tape on it where it meets the firewall. This is sticky. I had to give it a tug since it hadn't been off before.

Top side of the cowl.

Now it is time to remove the coil plug cover. There are four 10mm bolts holding the black plastic in place.

Removed the coil pack/spark plug cover.

Upon remove there will only be two more 10mm holding the number two and four coils in place.

Once the bolts are out unclip the harness leads.

The coil slides right out. We labeled them so we knew which ones went with each cylinder.

The coils didn't look too bad. There is some discoloration where it clips on to the spark plug. Bryan decided to order some factory replacements and install them next time. He is at 106K currently on the mileage.

Old plugs were Denso's. They had normal wear. New plugs beside the old ones.

The plugs get torqued to 12ft/lbs.

Now just put it all back together and you are good to go!

Not a bad go of things if you ask me. Pretty smooth and simple. This was our first go for this so we spent more time verifying we were doing things correctly and less time actually pulling stuff apart. I noticed for the B Service you should check and correct the valve clearances. I did not hear any noticeable issues nor was that on our radar this time around. Perhaps next time.


  1. It was fun doing this, thanks again for the help and tools!


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