Air Regulator

Air Regulator Testing:

AIR REGULATOR TESTING

***UPDATED BY TSB #9003003, JANUARY 25, 1990

NOTE: Begin test with cold engine.

1. Start cold engine and check that idle speed is slightly higher than specification.
2. Idle speed should normalize at 900 ± 50 rpm as engine temperature increases.
3. After engine has warmed up, turn it "OFF" and disconnect hose between air regulator and throttle body at throttle body side. Plug hole in throttle body.
4. Start engine and alternately open and plug off hose going to air regulator. Engine speed variation between an open and closed hose should be less than 50 rpm.
5. Engine speed variation greater than 50 rpm indicates a defective air regulator that should be replaced.

TESTING FOR NO FAST IDLE

1. Inspect hoses and connections; replace any defective hoses and ensure tight connections.
2. Disconnect air regulator harness connector and check resistance across terminals. If it deviates from the specified 48 - 52 ohms, replace the air regulator.
3. With ignition switch "ON," check for voltage at harness connector. If there is no voltage, inspect wiring and fuel pump relay. Repair wiring and/or replace fuel pump relay as necessary.
4. If there is voltage present at the harness connector and no other problems have been detected, replace air regulator.