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The distributor cap routes high-voltage current from the ignition coil to each spark plug in the correct firing order. It contains internal contacts that wear and carbon tracks that can cause cross-firing. A worn or cracked cap causes misfires, hard starting, and rough running. Replacement is a routine ignition service item.
Distributor caps are found on older vehicles with traditional ignition systems. Moisture, carbon tracking, and contact wear are the main failure modes.
Always replace the rotor arm at the same time as the distributor cap. They are matched wear items.
Commonly searched OE numbers fitting Ignition Distributor Cap from the TecDoc catalogue.
Common original equipment numbers linked to stocked alternatives.