How do you adjust the idle speed on a 2001 Volvo XC 70?
You can't. The idle speed is controlled by the Engine Control Module or ECM.
What is the black knob under the left carb on a 2005 Triumph Bonneville Motorcycle do. How does it work and how do you adjust it?
That is the idle adjustment. Turn it clockwise to increase the idle speed, counter-clockwise to lower the idle speed. You should not adjust the idle until your engine is fully warmed up, about 5 minutes of running. Adjust the idle speed to just over 1,000 RPM with the clutch in and the transmission in 1st gear. This is the most load your Bonneville will have at idle speed. You may need a bit of assistance…