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Home >> Plymouth >> 1987 >> Colt DL, 4D Sedan, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> EGR System >> Testing >> Vacuum Regulator Valve
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Vacuum Regulator Valve

Disconnect White-striped vacuum hose from vacuum regulator valve (Colt) or device box (all other models). Connect vacuum pump and apply 15.7 in. Hg of vacuum. If vacuum leaks with engine off, valve is okay. If vacuum holds with engine at 3500 RPM, valve is okay.