Distributor Wear
Symptoms
Misfiring, erratic idle, timing drift, poor fuel economy, hard starting.
Cause
The distributor shaft bushings wear, allowing the shaft to wobble. This causes the points gap to vary and the spark timing to become erratic. The centrifugal advance mechanism's springs weaken, and the vacuum advance diaphragm can rupture.
Fix
Rebuild the distributor, new shaft bushings, points, condenser, advance springs, and vacuum unit.
Budget $100-200 for parts.
Alternatively, fit an electronic ignition module (Pertronix) that replaces the points and condenser with a maintenance-free electronic trigger ($100-150).
This is the single most effective and invisible upgrade you can make to the ignition system.
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