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![]() ![]() ![]() Drives: NCP90 TRD Yaris Manual Join Date: Oct 2022
Location: Auckland, NZ
Posts: 272
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" Quite common problem - unstable or too low idle speed, sometimes supplemented by power loss at medium speed. There are not definite cause and universal solution, but these engines like cleanness - washing of the throttle body, ISCV, MAF-sensor, PCV valve may have an effect. However, the owners overly fixated on the washing, forgetting that sometimes ISCV, MAF, ignition coil or VVT actuator just have to be changed."
from the engine manual. So next is to clean idle control valve, and throttle body if you didnt do that one already. After that im afraid you need a friend with the same cay to try swap parts to see which fixes it...Or a really cool scrappy who will let you do that and then buy the parts you need. If you can find a crashed one, buy them one at a time, have the guy mark them so you can rerturn it if it doesnt help. they are easy to install so could do it at the wreckers shop. Problem is it could be any of those things listed. So you cant tell till you swap them out one at a time ansd see which fixes it. Start with the chepest on the list and work your way forward. Also the coils can be tested and you can probably look up what they should be at to see if they are weak, would be strange tho that all four are weak. |
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