just had to do this with mine and still couldnt get it down for mot as it was from a 2.0l, i have it on a 1.6. the screw you need is below the throttle lever on the bottom corner, if it just looks like a blank hole the screw is probably right inside, it is best to get it on a continuous test at the garage and have a play, you may need to adjust the idle and fast idle screws as well. hope this helps, good luck.