IACV Diagnosis
#1
IACV Diagnosis
I have a 94 Civic DX 1.5 16 valve. For quite sometime now my idle surges up and down once the car is warmed up. I have cleaned the valve a couple of times and it hasnt helped. Recently I decided to try something. Once the car was warmed up I unplugged the valve and it stopped idling up and down. Then plugged it back in and the idle was still fine but the engine light obviously came on and I drove it about 10 miles and parked it. The idle stayed normal. I then shut the key off and started it back up 5 minutes later. The engine light went out and it immediately started idling up and down again. So I repeated everything i did and it did the same thing. Once I shut the key off and turn it back on the light goes out and starts idling up and down. For some reason when I unplug it the idle goes fine and the light comes on but once I shut the key off and start it back up and the light goes out it starts all over again. Any ideas if this could actually be a bad valve or is it something else?
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