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 MANUALSTOYOTA1984CRESSIDA 4D WAGONREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMEGR FUNCTION TESTINGSYSTEM TESTINGEGR SYSTEM
1984 Toyota Cressida 4D Wagon
EGR System
1984 Toyota Cressida 4D WagonSECTION EGR System
- Disconnect vacuum hose from EGR valve (valve A) and, using a 3-way union, connect vacuum gauge to it. Check that engine starts and runs smooth at idle. See Fig 1.
- Check VSV with coolant temperature be below 135°F (57°C). Check that vacuum gauge indicates zero at 2500 RPM.
- With engine warm, check VSV and EGR vacuum modulator. Check that vacuum gauge indicates about 2.76 in. Hg at 2500 RPM. Check that vacuum gauge indicates zero at idle.
- Disconnect vacuum hose from EGR valve (valve B) and plug hose end. Apply vacuum and maintain a 23.62 in. Hg to valve B. Maintain engine speed at 2500 RPM. Release the vacuum.
- Check that engine speed drops about 200 RPM. Disconnect vacuum gauge. Reconnect vacuum hoses to the proper location.
- To check EGR valve, stop engine. Remove EGR vacuum modulator exhaust gas hose and plug it. Start engine and race it once. Apply vacuum directly to EGR valve with engine idling.
- Engine should run rough or die. Reinstall EGR vacuum modulator. Reconnect vacuum hoses to proper location.
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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.