Brad's Car Manuals: A 3rd party mirror of CHARM + LEMON car manuals
Home >> GMC >> 1992 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> EGR Function Testing >> EGR Function Testing >> Diesel EGR

Diesel EGR

Download the full database via torrent (~1.1 TB)  |  Download Brad's custom LEMON patches
  1. Turn engine off. Disconnect vacuum hose to EGR valve. Connect a hand-held vacuum pump to EGR valve and apply 10 in. Hg. EGR pintle should move up and stay up for at least 20 seconds. If not, replace EGR valve.
  2. To check vacuum pump operation, connect vacuum gauge to vacuum inlet (small fitting). DO NOT plug or disconnect outlet fitting. With engine idling, vacuum should be at least 18 in Hg one minute after start. If not, check for belt slippage, vacuum leaks or other obvious defects. If vacuum reading is as specified, replace EGR valve.
scientia non olet · About Brad's Car Manuals