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Porsche Warm Up Regulator Repair Kit - 911/924/928 74-90 911-606-04 958-351-403-01--ZCZ Porsche Fastening Rail (Right) ForPorsche Warm Up Regulator Repair Kit For Porsche 911 (1974 1990), 924 (1978 1986), 928 (1977 1982) Models. The warm up controller and the flow divider are the central components of the K Jetronic injection system. A rough running engine or poor starting behavior are a common sign of worn seals and components. While the warm up regulator controls the amount of fuel, the flow divider ensures the synchronous distribution of the fuel to the cylinders.