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I've had no issues previously testing disa valves based on RPM. Maybe load has an effect but I haven't noticed it. It's almost guaranteed that I will always feel one disa open at 3500 and the other at 4300 while driving and same when testing with one hooked up to the cable and the car revving. Maybe that disa is bad indeed or you grabbed the connector for something else.
However don't condemn the valve itself so soon because I've noticed while testing valves that if I do the test of turning off the engine for it to open and turning it on for it to close shut, it won't do it if I disconnected it while the engine was running previously as it'll still have a stuck fault for it in the DME (which stops using both if one throws a code) it does it after a 2nd try though.
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Airplane Mechanic
BMW Masochist
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