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 MANUALSCHEVROLET1987CHEVETTE L4-98 1.6LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMTHERMAL VACUUM VALVETESTING AND INSPECTION
1987 Chevrolet Chevette L4-98 1.6L
Thermal Vacuum Valve: Testing and Inspection
1987 Chevrolet Chevette L4-98 1.6LSECTION Testing and Inspection
Fig. 30 EGR/EFE/EMR Thermal Vacuum Switch:
Below the switching point, Ports 1 and 2 and 3 and 6 should be connected, while Ports 4 and 5 should be sealed, Fig. 30.
Above the switching point, Port 1 should be connected to Port 5, Port 2 should be connected to Port 6, and Port 3 should be connected to Port 4.
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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.