just wondering about this, so when the engine is of the rod s fully extended, and when you turn the engine on the rod moves in, and when you rev the engine and let of the rod extends out and goes back in again, so im wondering if my rod is holdong boost ok,

so my question is when the engine is on idle and the rod has moved in, if i rev it should the rod move in futher? because mine doesnt. or will this only work when the car is on the road?