Connecting Dwell Meter

Set "6 Cylinder" position and connect meter to a lead from the mixture control solenoid. On normally operating engine, dwell at both idle and part throttle will fluctuate between 10-50°. This is the "closed loop" system, meaning the dwell is varying due to reaction from the oxygen sensor through the ECM. At wide open throttle or cold engine, dwell will be fixed (needle steady). This is the "open loop", since oxygen sensor has no effect on the dwell.