EGR TECH TIP

Some EGR valves (Like 5.0L Ford) have what I call a metered leak. In this EGR tech tip we will show you how to tell the difference between a good or bad EGR valve. Perform this test before making any changes to the system (Don’t block intake with yellow cap plugs)

v Attach the power leads to the battery. Red to (+) and Black to chassis ground.

v Insert the supply hose into a direct vacuum manifold source. (Brake booster hose or PCV)

v Push and hold remote control button.

v EGR SMOKES WITHOUT BLOCKING OFF ENGINE (SUSPECT)

v EGR SMOKES ONLY WITH ENGINE BLOCKED OFF (NOT SUSPECTED)

Remember that you are only testing the EGR pintle shaft NOT the diaphragm

You can also use this technique to find other metered leaks, like – throttle shafts.