Brad's Car Manuals: A 3rd party mirror of CHARM + LEMON car manuals
Home >> Ford >> 1988 >> Bronco II 4WD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> System >> Deceleration Control System >> Testing >> Throttle Positioner (Modulator) Diaphragm Check

Throttle Positioner (Modulator) Diaphragm Check

Download the full database via torrent (~1.1 TB)
  1. Disconnect vacuum line from diaphragm. Connect a vacuum pump to diaphragm. Apply 19 in. Hg vacuum.
  2. If diaphragm does not respond, or will not hold vacuum, replace diaphragm. If diaphragm responds and holds vacuum, proceed with testing.
  3. Remove vacuum pump from diaphragm. If diaphragm does not return within 5 seconds, replace defective diaphragm. Reconnect vacuum line. If diaphragm returns in 5 seconds, diaphragm is good.
scientia non olet · About Brad's Car Manuals