Need a hand identifying what these two plugs are. Engine is a '98 Impreza EJ20 (N/A).

The first:



The round one with the hex centre. Located here, above the left lead plug:



Second one:



Located under the two throttle cables here:



Reason being, I snapped my centre dash cover lid & decided rather than taking the easy option of replacing it, I'd do a triple gauge install to actually try and work on something vaguely mechanical/electrical... was going to use a t-piece where the factory sender is but there isn't enough room so need another spot.

Sandwich plate isn't an option either. Don't really like the idea of a potential oil leak onto the exhaust...

I think they are there in case of your coolant freezing and allowing the plugs to relieve pressure as so the block doesn't crack if the engine freezes.

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F1 Inspired

knock sensor

Back of the engine under the throttle body on the drivers side. That plug is for the oil gallery. The other one is a knock sensor. Do not remove the knock sensor. A good quality sandwich plate shouldn't leak

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Marti


Car: C Red S13 Silvia 2.3l 400+rwhp-SOLD
Daily ae82 4age corolla (light mods)-Sold
Daily:SWB GQ Patrol
Will be a 03-04 STI next

Haha I definitely won't be removing that one, was more just curious to see what it was. Cheers for the help!

I thought it was a factory oil sensor, comes up with a red light if it detects a problem, 99% sure I've seen several guides explaining how it can be used for fitting an after market oil pressure sensor and you just tuck the factory sensor to one side.

3/4 the way down the page : DEFI BF install -Step by step with pics - 24 May - INSTALL COMPLETE - Subaru Impreza WRX STI Forums: IWSTI.com

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1989 Legacy GT --> 2001 GD WRX --> 1999 GF8 WRX --> 2001 GD WRX

^ Read that entire link.

I'm following that guide next week when I fit my water temp/oil pressure and boost gauge in my triple gauge holder.

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1989 Legacy GT --> 2001 GD WRX --> 1999 GF8 WRX --> 2001 GD WRX

the one at the front to the left of the crank angle sensor is your oil pressure switch, you can t peice into that if you want but its easier to just undo the plug at the back of the block

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Marti


Car: C Red S13 Silvia 2.3l 400+rwhp-SOLD
Daily ae82 4age corolla (light mods)-Sold
Daily:SWB GQ Patrol
Will be a 03-04 STI next

What.

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Wand basics:
One must brake with the left hand and steer with the right foot.
Having Defi's does not make Racecar..

I think you mean core plugs.core plugs are in the block to stop it from cracking if the coolant freezes.tempreture here doesn't reach -20-30 degrees here so a frozen block should be the least of your worries

__________________
Marti


Car: C Red S13 Silvia 2.3l 400+rwhp-SOLD
Daily ae82 4age corolla (light mods)-Sold
Daily:SWB GQ Patrol
Will be a 03-04 STI next