Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA1984CAB & CHASSIS DXREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMEGR FUNCTION TESTING - DIESELSYSTEM TESTINGEGR SYSTEM
1984 Toyota Cab & Chassis DX
EGR System
1984 Toyota Cab & Chassis DXSECTION EGR System
- Using a 3-way connector, connect a vacuum gauge to the hose between the EGR valve and VSV (VCV on Corolla). Check seating of EGR valve. Check that engine runs smoothly at idle. See Fig 1.
- With the coolant temperature below 95°F (35°C), check the BVSV. Run engine at 1450 RPM. Check vacuum gauge. It should read 0.
- With engine at operating temperature. Check that the vacuum gauge indicates more than 11.8 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. Perform this test quickly to avoid overheating engine. If no problem is found with this inspection, the system is OK.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.