4A-GE MK1 Engine unknown wires [Archive] - Toyota MR2 Message Board

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hi there guys i am new to the site and have picked up a MINT 1984 aw11 this thing is flawless! (apart from the auto box) very happy with how well these thing handle o how i wish it was manual... just been going over it and found these 3 plugs when i was under it doing and oil filter change could anyone please help me out here want to know if they very important? cheers!