EGR Delay Timer System 6-Cylinder And V8 Models

First check all of system for proper hose and wiring connections.
With ignition switch off, remove wiring connector from the time delay solenoid valve. Connect an indicating light type circuit tester across wiring connector terminals just removed.
Start engine. Tester light should go on and remain on for amount of time as shown in color code Application chart.
If light does not go on, remains on indefinitely, or does not react within time limit shown after engine start up, replace timer, then repeat test.
CAUTION: To avoid overload of timer, tester current draw should not exceed 0.5 amps. A typical automotive 12V tester is satisfactory for this test, or a shop-made tester using instrument panel size bulbs is also suitable.