Wide Open Throttle Enrichment-Turbo Only

SYSTEM FAILURE SYMPTOMS:
Hesitation or lean surge when accelerating or running with wide open throttle or engine speeds above 3800 RPM.

TEST:

1. Plug in cold/hot start ground (G) and time relay (C-B) and reconnect brown wire on the vacuum impulse switch.

2. Unplug the oxygen sensor. Prevent the harness lead from touching body.

3. Connect the pulse ratio meter to the test plug.

4. With the engine idling, the pulse ratio indicated on the meter should increase to 75/25 when the throttle housing microswitch is closed.

5. Raise the engine speed slowly while watching the pulse ratio meter, at 3800 RPM the meter should lock on 75/25.

6. If inoperative,

a) Check for continuity through the microswitch when closed.

b) Test the following terminals at the relay socket:



Terminal 30 ground to negative buss bar at the fuse panel
Terminal 31 negative buss bar at the fuse panel
Terminal 31b primary ignition circuit pulse read with a dwell meter
Terminal 15 +12V when the fuel pump is operating
Terminal 87 75/25 +/- 10% pulse ratio when grounded with engine running