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Home >> Sterling >> 1988 >> 825 SL, 2.5 C >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - PGM-FI System >> Testing >> Dashpot System
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Dashpot System

  1. Check vacuum hose for blockage or leaks. Disconnect vacuum hose from dashpot. Connect hand-held vacuum pump/gauge to hose to diaphragm. Apply vacuum and check that vacuum slowly decreases.
  2. If vacuum holds steady or decreases rapidly, replace dashpot check valve and retest. Connect vacuum pump/gauge directly to diaphragm fitting. Apply vacuum. Ensure that rod pulls in and vacuum holds. If not, replace diaphragm and retest.