It seems to me that the last time I removed and inspected the idle actuator on my 91L I could move the rotating gate. I have the actuator off again but the gate, this time, is frozen. Am I right in thinking something's wrong?
If I understand you, I should rotate it to the closed position and keep rotating in that same direction. No can do. My fault, probably. I put a burr on the edge of the vane when trying to pry it farther open with a screwdriver. I think that's catching on the lip of the actuator body. Rats!!!
Hooray! I managed to scrape the burr away! The vane revolves freely as per your description. There's a small chip at the leading edge (where the burr once was) but I hope that won't affect the overall performance of the actuator. We'll see...
You can get a good used one from a Volvo 240/740/940 on eBay or local salvage yard. Same Bosch number O 280 140 516. If you want to have a back up they are worth picking up, cleaning and having ready to swap out.