LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 1991 >> Civic Base, 2D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Throttle Controls >> Throttle Control Dashpot
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Throttle Control Dashpot

  1. Start engine, and warm to full operating temperature. Disconnect vacuum hose from throttle control dashpot diaphragm, and check engine speed.
  2. Engine speed should be 2000-3000 RPM. If engine speed is excessively high, adjust engine speed by bending tab on throttle shaft linkage. If engine speed does not change after bending tab, connect vacuum gauge to throttle control dashpot diaphragm vacuum hose, and check vacuum. Vacuum should be present.
  3. If vacuum is present, replace throttle control dashpot diaphragm, and retest. If vacuum is not present, check dashpot diaphragm vacuum hose for improper connection, cracks and blockage. If necessary, check and replace vacuum "T" fitting (if equipped).
  4. Reconnect throttle control dashpot vacuum hose, and check idle speed. Idle speed should be as specified. See SPECIFICATIONS article in the ENGINE PERFORMANCE Section.
scientia non olet · About LEMON Manuals