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Thermal Vacuum Valve: Testing and Inspection
Fig. 5 EGR Thermo Valve:
1.
Start engine and run at idle until it reaches normal operating temperature.
2.
Disconnect vacuum hose from
EGR valve.
3.
Apply intake manifold vacuum to
EGR valve.
4.
If engine does not run rough or stall, test
EGR valve.
5.
If
EGR valve is not defective, replace
EGR thermo valve Fig. 5.