System Inspection

Warm engine to normal operating temperature and run at idle. Connect dwell meter to White check connector pin No. 1. See Fig 1 . Note dwell meter reading.

If Dwell Meter Reading Is 0 Degrees

• Check pulse signal at engine control unit.
• Check vacuum sensor operation.
• Check coolant temperature sensor operation.

If Dwell Meter Reading Is 27 Degrees

• Check intake air temperature sensor operation.
• Check vacuum hose routing.
• Check O2 sensor operation.

If Dwell Meter Reading Is 36 Degrees

• Check coolant temperature sensor operation.

If Dwell Meter Reading Fluctuates Above Or Below 20-70 Degrees.

• Check vacuum hose routing.
• Check O2 sensor operation.
• Check air/fuel solenoid valve and wiring harness.
• Check carburetor jets and air bleeds.