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. Run engine at 1300 RPM. Check vacuum gauge. It should read 0.
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- With engine at operating temperature. Check that the vacuum gauge indicates more than 7.9 in. Hg above 1450 RPM. Reduce engine speed gradually. Vacuum gauge should read 0.
- Check throttle position switch. Increase engine speed above 4800 RPM gradually. Check that the vacuum gauge reading gradually decreases to about 7.87 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 gauge indicates less than 5.91 in Hg above 4800 RPM. 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.