polobai

Good afternoon all, wanted to do a little writeup on this as I have seen guides for the 991.1 but not for the 991.2 and the setups are quite a bit different. I am in process of doing this, so it may take a couple days to complete. To be clear, I was not sure if the 991.2 had a 3 year/40k service interval, or a 4 year/40k service interval. I did the earlier one to be safe but my car has 15k miles on it and was built in March of 2018 (2018 Carerra T). As of writing this, I have completed the drivers side (3 plugs) with no issues. I purchased the plugs from FCP Euro along with a few other items (Mahle Oil filter, Hengst cabin filters, etc).


Bosche Oe plugs part number 8124

Part numbers and info

X51

Look forward to your DIY log...

polobai

First up, is to remove the rear wheels and the turbo inlet tube. I can say to change the plugs it would be the easiest to do while the rear bumper and intercooler cage assembly is off the car but it’s not necessary. Just makes getting to things harder and you need a good assortment of extensions, wobbles, etc.


Loosen the clamp that attaches to the inlet and the worm clamp up top that connects to the air intake

Removed by pulling from the inlet end first gently.

polobai

Next up is to remove the heat shield covering the coils. There are two torx bolts here and there is also a wire clipped to it that you will need to pull off.


First bolt is easy

Second...not so much. Needed a couple wabble extensions on a 1/4 socket set

Here is what I used.

Here is where you have to pry off the clip holing on the wire to remove the shield.

polobai

Once the heat shield is off, you have access to the first two coils (this is on the drivers side). Loosen the torx bolt holding the coil in (does not come out completely), disconnect the connector and pull the coil by gently turning and pulling. Should pop out with just a bit of force.

polobai

In one of the other threads, it was recommended to get the tool below to remove the spark plugs on the 991.1. I can confirm that this tool DOES NOT work on the 991.2 as the 991.2 uses a 14mm 12 point socket. Thankfully I had one around from my days of installing head studs on Supra motors. I used this socket in addition to a magnet to pull out the plugs.


Don’t buy this for you 991.2

The angle that the plugs come out at.


Here is what you need

polobai

The forward two plugs are easy to get to-the back you can’t even see. Here is where you have to use some ingenuity, wobbles and extensions to access the last plug.


How it looks

What it looks like from behind the turbo

polobai

Plugs removed from the drivers side and comparing new to old.


Oem plugs in good shape. Didn’t have to be replaced but better safe than sorry.

New vs old. Same plug.

polobai

Install is the reverse of removal-be mindful of the angle the plugs go in as it’s not centered in the hole. I suggest starting by hand on an extension and then tightening with the ratchet. I tightened 1/2 a turn past where it seated on the ratchet. I also added some di-electric grease to aid in future removal. The oem plugs had something similar and the oem manual calls for talcum powder which I didn’t have and they didn’t seem To use from factory.


Di-electric grease applied to the top of the insulator.

polobai

To add, no anti-seize was added to the threads as its not recommended nor was it on the OEM plugs.

Carlo_Carrera

To add also, the plug sockets are available on eBay. Many new cars are using its thin wall 12 point design.

https://www.ebay.com/itm/14mm-Spark-...A/312664307385

r00t61

991.1 is 4 years/40,000 miles
991.2 is 3 years/30,000 miles

I guess turboing the DFI engine leads to the reduced maintenance interval

Joec500

Makes sense, Turbo's probably introduce more heat and pressure.

polobai

Not to clog up the thread but my cabin filter in the bay was pretty dirty-the one inside not so much.


Skipped this at 2 year service. Probably shouldn’t have.

This one was in good shape.

asellus

ah, beat me to it. Was gonna do this in the next month or so. I'll still be making a video more than likely.

thanks for the info!