Brad's Car Manuals: A 3rd party mirror of CHARM + LEMON car manuals
Home >> Jeep >> 1981 >> Pickup J20, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Gas RECIRCULATION >> Testing >> EGR Valve >> Valve Opening Test

Valve Opening Test

Download the full database via torrent (~1.1 TB)  |  Download Brad's custom LEMON patches
  1. With engine at normal operating temperature and at curb idle, rapidly open and close throttle (open throttle sufficiently to obtain at least 1500 RPM). A definite movement should be noticed in the EGR diaphragm.
  2. If diaphragm does not move, probable causes are: faulty vacuum signal to EGR; defective EGR diaphragm or defective back-pressure sensor diaphragm (if equipped); or leaks in vacuum lines or connections.
scientia non olet · About Brad's Car Manuals