Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
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EGR Control Solenoid: Testing and Inspection
Apply 13.2 to 14.4 inches Hg. of vacuum to port connected to intake manifold and apply air pressure to port connected to
EGR signal vacuum line and check for leakage. If leakage is not noted, replace assembly.