One of the most commonly overlooked belts on the 964/993 is the one that you can’t see (other than the 993 PS belt, lol). The twin plug distributors use an internal belt to time both ignition rotors together, allowing the cylinder to fire on both the top and bottom spark plug. If this breaks, the secondary ignition rotor stops spinning, thus no spark to half of the spark plugs. If you are lucky, the rotor stops in a position between …

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