Air By-Pass Valve
- Disconnect air by-pass valve-to-exhaust manifold hose from air by-pass valve. Start engine and run at idle. Place finger over air by-pass valve outlet and make sure air is escaping.
- Increase engine speed and quickly release accelerator. Air should stop flowing for a few seconds. If air does not flow out or air flow lasts for more than 3 seconds, replace air by-pass valve.