LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 1988 >> Tempo Base >> Repair and Diagnosis >> Engine Performance >> System >> EGR System >> Component Testing >> EGR Valves >> Integral Backpressure (IBP) Transducer EGR Valve
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Integral Backpressure (IBP) Transducer EGR Valve

  1. Ensure vacuum system is correctly routed and in serviceable condition. There should be no vacuum to EGR valve at idle (engine at normal operating temperature). Disconnect ISC solenoid connector. Install a tachometer.
  2. Plug the exhaust tailpipe(s) to increase exhaust backpressure for testing purposes. Leave a 1/2" hole to allow exhaust gases to escape. Disconnect and plug vacuum supply hose from EGR valve nipple. Start engine and ensure engine idle speed is within specification.
  3. Using a hand pump, slowly apply 5-10 in. Hg vacuum to EGR valve. With vacuum applied, idle speed should drop about 100 RPM (engine may stall). If speed does not drop, replace EGR valve. If speed drops, release vacuum and ensure engine speed returns to normal +/-25 RPM.
  4. Reconnect ISC connector and EGR supply hose. Remove plugs from exhaust tailpipe.
scientia non olet · About LEMON Manuals