EGR System
- Using a 3-way connector, connect a vacuum gauge to the hose between the EGR valve and VCV. Check seating of EGR valve. Check that engine runs smoothly at idle. See Fig 1.
- With the coolant temperature below 122°F (50°C), check the BVSV. Check vacuum gauge. It should read 0.
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- With engine at operating temperature. Check that the vacuum gauge indicates more than 5.3 in. Hg at 1300 RPM. Reduce engine speed gradually. Vacuum gauge should read 0.
- Check vacuum control valve (VCV). Increase engine speed above 4800 RPM gradually. Check that the vacuum gauge reading gradually decreases to about 5.3 in. Hg and then goes abruptly to 0. Disconnect vacuum gauge, and reconnect vacuum hoses to the proper location.
- Check the VRV, disconnect vacuum hose from VRV output port and connect a vacuum gauge. Check that vacuum gage indicates 0 above 5000 RPM. Perform this test quickly to avoid overheating engine. If no problem is found with this inspection, the system is OK.