How's your intake manifold gasket?? I went through this same situation with my friends GSR he kept getting intermittent Code 14's we cleand than replaced his IAC and nothing...then I was fiddling around by the head nad I felt something and sure enought a piece of his gasket had cracked and was leaking...after that, we replaced the gasket and the code was gone.
Sorry for reviving this almost 4 year old thread, but I am having the same problem. I've searched tons of threads but couldn't find anything.
I have replaced the IACV, there's plenty of coolant, no vacuum leaks, my IM gasket is good.. all with no luck. It's a 96 Hatch with a D16y7, with an EX intake manifold. I used the stock throttle body with the 3 wire IACV. The IACV is functioning properly but I still get the CEL code 14. I haven't considered it being a bad ECU, but I guess it's possible? The CEL just came on one day, it didn't happen after working on the car or anything.
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