Corolla, Land Cruiser & Tercel
- Warm up engine and check ignition timing at idle. Disconnect vacuum hose from distributor sub-diaphragm and plug hose end.
- Check that ignition timing remains stationary for more than 1 minute. Stop engine and reconnect hose to check valve.
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- Disconnect 2 hoses on top of HAC valve. Blow air into each hose and check that air flows into carburetor. Reconnect hoses to proper locations.
- Warm up engine and disconnect vacuum hose between HAC valve and distributor at HAC valve side, and plug hose end. Disconnect vacuum hose from distributor sub-diaphragm, and plug hose end.
- Check ignition timing; timing should be 5° BTDC. Reconnect hose to distributor sub-diaphragm. Check ignition timing; timing should be about 13° BTDC.
- Disconnect vacuum hose from check valve at Black side and plug hose end. Check that ignition timing remains stationary for more than 1 minute. Stop engine and reconnect hoses to proper location.
- Disconnect 2 hoses on top of HAC valve. Blow air into each hose and check that air flows into carburetor. Reconnect hoses to proper locations.