Spark Plug Change from Under The Engine? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

hachigoku · 09-26-2021, 03:14 AM

I wanted to know if doing the plugs and coils from the bottom of the engine is an alternative way of doing them? I need to install my UEL again and if my stock header is off is there more room?

86TOYO2k17 · 09-28-2021, 12:38 PM

Quote:

Originally Posted by hachigoku

I wanted to know if doing the plugs and coils from the bottom of the engine is an alternative way of doing them? I need to install my UEL again and if my stock header is off is there more room?

nope, but doing spark plugs is a cake walk when you jack of the engine. Jack up one side, swap header and plug, jack other side swap header plug and done.

StatusIsChecked · 09-28-2021, 02:11 PM

Unfortunately I don't think going from underneath is any easier than shoving your hand from up top. You might be better off unbolting two motor mounts and jacking up the engine a few inches, I hear it makes a world of difference. You will want to check a YouTube video of someone doing this to see if it's best for you.

I cannot speak from experience. I was able to replace my spark plugs with the engine out of the car during a body shop repair.

zberz · 10-02-2021, 07:54 PM

I can say from experience, ignore the first YouTube hit where some dude swears you can do it without jacking up the engine. Maybe you can, but it's not worth trying.

1) Put at least the front on jack stands
2) Remove the two motor mounts on the bottom
3) Jack up one side at a time from the head, or headers right under the head
4) Have faith that your harbor freight hydraulic jack won't fail while you replace the plugs one side at a time
5) Don't forget to re-secure the motor mounts

A couple of inches worth of lifting makes a big difference in being able to get the coil packs and plugs out. Having an assortment of ratchet attachments and u-joints also helps. A rubber jack pad is also nice to have to avoid metal-on-metal and the possibility of slipping.

Sent from my SM-G950U using Tapatalk

hachigoku · 10-03-2021, 01:43 AM

Just did the entire procedure with jacking up the engine. It honestly was not that bad and it was so easy.

blsfrs · 10-03-2021, 11:08 AM

I found that I got a little better access by removing one motor mount bolt and just loosening the other so that the engine would tilt the desired side up.

09-26-2021, 03:14 AM	#1
hachigoku Member Join Date: May 2017 Drives: BRZ, E90 M3 Location: San Francisco, CA Posts: 50 Thanks: 3 Thanked 8 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Spark Plug Change from Under The Engine? I wanted to know if doing the plugs and coils from the bottom of the engine is an alternative way of doing them? I need to install my UEL again and if my stock header is off is there more room?

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09-28-2021, 02:11 PM	#3
StatusIsChecked Member Join Date: Dec 2020 Drives: Scion FRS Location: Texas Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Unfortunately I don't think going from underneath is any easier than shoving your hand from up top. You might be better off unbolting two motor mounts and jacking up the engine a few inches, I hear it makes a world of difference. You will want to check a YouTube video of someone doing this to see if it's best for you. I cannot speak from experience. I was able to replace my spark plugs with the engine out of the car during a body shop repair.

10-02-2021, 07:54 PM	#4
zberz Senior Member Join Date: Dec 2015 Drives: 2015 Lightning Red BRZ Location: U.S. Posts: 190 Thanks: 245 Thanked 131 Times in 66 Posts Mentioned: 1 Post(s) Tagged: 2 Thread(s)	I can say from experience, ignore the first YouTube hit where some dude swears you can do it without jacking up the engine. Maybe you can, but it's not worth trying. 1) Put at least the front on jack stands 2) Remove the two motor mounts on the bottom 3) Jack up one side at a time from the head, or headers right under the head 4) Have faith that your harbor freight hydraulic jack won't fail while you replace the plugs one side at a time 5) Don't forget to re-secure the motor mounts A couple of inches worth of lifting makes a big difference in being able to get the coil packs and plugs out. Having an assortment of ratchet attachments and u-joints also helps. A rubber jack pad is also nice to have to avoid metal-on-metal and the possibility of slipping. Sent from my SM-G950U using Tapatalk

10-03-2021, 01:43 AM	#5
hachigoku Member Join Date: May 2017 Drives: BRZ, E90 M3 Location: San Francisco, CA Posts: 50 Thanks: 3 Thanked 8 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Just did the entire procedure with jacking up the engine. It honestly was not that bad and it was so easy.

10-03-2021, 11:08 AM	#6
blsfrs Senior Member Join Date: Dec 2018 Drives: 2013 frs base Location: central Virginia Posts: 1,440 Thanks: 2,684 Thanked 1,442 Times in 685 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	I found that I got a little better access by removing one motor mount bolt and just loosening the other so that the engine would tilt the desired side up.

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