Do not force the feeler gauge into the air gap. This should be a go-no-go tolerance. Unless the distributor sensors depend directly on the electronic module for operation, as they do in the American Motors Breakerless Inductive Discharge System (BID), the engine analyzer may be used to check the magnetic pickup coil. To check the coil, operate the analyzer in the self-sweep mode and disconnect the pickup from the harness.
NEVER connect the analyzer to a distributor without first referring to the operator's manual for the correct procedure.
Connect the red and black test probes across the pickup coil wires and crank the engine as you observe the screen display. The screen trace should oscillate above and below the zero line if the pickup is good.
Since current model engines burn a leaner fuel air mixture within the cylinders, a special means of igniting this mixture is required; for example, the electronic lean burn system (fig. 4-34). It consists of a solid-state spark control computer, various engine sensors, and a specially calibrated carburetor. Also, the distributor provides centrifugal spark advance only (no vacuum
Figure 4-34.-Lean burn ignition system.Continue Reading