Engine Maintenance and Modification Bradley Artigue

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FIAT 124 Spider Engine Maintenance + Modification the computer to increase the amount of fuel. The system will also increase or decrease the amount of fuel based on the temperature of the air entering the system. 5.7 The Oxygen Sensor A final sensor performs continuous monitoring of the exhaust gases. This input is used by the computer to adjust fuel flow to best reach lambda. The oxygen sensor, also known as a lambda sensor, is a ceramic and platinum electrode. The ceramic permits diffusion of the oxygen present in the air. At engine operating temperatures it becomes conductive; when the level of oxygen on one side of the electrode is different from that on the other side a voltage is generated. This voltage is reported back to the fuel injection computer. Sensor operation becomes effective at temperatures above 350 degrees Celsius; below this range the fuel injection computer receives no meaningful input. Many vehicles employ heated oxygen sensors that output data to the computer much faster; the FIAT uses the unheated type. 5.8 Other Components If you flip back to the overview diagram (figure 33) you’ll notice a number of other fuel injection pieces and parts that we did not cover. Some of them, such as the air conditioner bypass valve, exist to provide extra air into the plenum when a load (such as the a/c compressor) is switched on. Rarely do FIAT Spiders even have this valve, but if you have the aftermarket air conditioner it may be fitted. You’ll also notice the fuel delivery components, the fuel pump, fuel filter, fuel manifold, and fuel pressure regulator. These are responsible for fuel delivery (pump), filtering (filter), routing (manifold) and maintaining constant flow rates to each injector (regulator). The regulator keeps the flow constant by increasing fuel pressure and manifold pressure is near ambient and dropping pressure as the manifold vacuum increases. 44
FIAT 124 Spider Engine Maintenance + Modification 5.9 Component Reference The following pages contain sketches and part numbers for the various fuel injection system components and brief descriptions of each. Table 3: Major Fuel Injection System Components Component Description Lambda Sensor P/N 0 258 001 051 The lambda sensor meters the presence of oxygen in the exhaust gases and reports the level of oxygen to the ECU. It is located in the exhaust system before the catalytic convertor. Failure of this sensor will occur at approximately 30,000 miles or sooner on a poorly operating engine and will result in reduced efficiency. An engine that burns oil will ruin the sensor regularly. Air Flow Meter P/N 0 280 202 023 The air flow sensor is the point of entry for air into the fuel injection system. It measures the volume and temperature of air entering the engine and switches the fuel pump on when air is drawn into the engine. Coolant Sensor Replace with good picture P/N 0 280 130 023 The water temperature sensor is a hex-head brass component located in the cooling system pipes. On a 2000cc engine it is located in the coolant "T" in front of the head and between the cam drive wheels and the radiator. 45
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Engine Maintenance and Modification Bradley Artigue

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