Engine Maintenance and Modification Bradley Artigue

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FIAT 124 Spider Engine Maintenance + Modification Component Description Auxiliary Air Regulator P/N 0 280 140 120 or 0 280 141 013 (Spider with A/C) This device allows air to be drawn directly into the plenum, bypassing the throttle plate. The effect is an increase in idle speed – the computer will give the engine more fuel to create an appropriate ratio to the inbound air. Once engine temperatures reach the normal operating range the auxiliary air valve closes. Fuel Pressure Regulator P/N 0 280 160 214 The fuel pressure regulator receives fuel from the fuel pump and keeps the fuel pressure into the injectors constant. It is located on the fuel rail and connects (via the rail) to the injectors and fuel pump. A smaller vacuum hose connects this regulator to the intake manifold. It maintains a constant flow rate at the injector tip as manifold pressure varies; increasing fuel pressure when manifold is near ambient and dropping it as the manifold vacuum increases. Failure of this device can cause fuel starvation or too much fuel in the system, affecting performance. Fuel Pump P/N 0 580 464 019 Located under the car and near the fuel tank, the fuel pump delivers fuel through the fuel filter and the fuel rail and into the injectors. 46
FIAT 124 Spider Engine Maintenance + Modification Component Description Fuel Injector & Seals Fuel Line Connector Body Tip P/N 0 280 150 127 (DS0 Spiders) or 0 280 150 121 (CS0 Spiders) Seals P/N 1 280 206 702 and 703 A fuel injector is an extremely simple electrical device. The ECU will send a small current to the injector (via the connector), opening the injector and allowing fuel from the fuel rail to spray through the tip and into the engine. The tip of the injector is an insulator; the injector itself is a small opening in the center of the tip. Injectors are seated in the manifold with large rubber isolators around the tip and the injector body, insulating the injector from vibration. Cold Start Injector P/N 0 280 170 041 Upon receiving the "on" signal from the ECU, the cold start injector sprays fuel into the intake plenum, creating the rich fuel mixture required during cold starts. The duration of time in which the injector operates is determined by the thermotime switch. Double Relay P/N 0 332 514 127 The double relay consists of two relays molded into a single container. It is located near the ECU. Signals from the ECU enter the relay and trigger higher voltage components. 47
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Engine Maintenance and Modification Bradley Artigue

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