If you just need to know whether they are opening at all, just pull each one back and stick a piece of paper between the rest and the VRIS lever then go for a rip around the block. If they are opening then the piece of paper should have fallen out.
BTW this is the no-brainer method, there are others but this is just the easiest to do.
Just take the car out on an open road and floor it. If you feel a slight kick in power at around 3250 and 4750 then you know that both butterflies are working correctly. if not then you might have a problem, but you would feel a noticable power drop off if they aren't working, again at those two rpm points.
I just tried the method of testing my VRIS valves by sticking the pieces of paper behind those little levers that are supost to open and drove the hell out of it. They were still there. The odd thing about it, is that I still can feel the hp boost at 3200 and 4200 rpms. Are there any other testing methods? Should I just tie them open or leave them alone?
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