Scion 17141-21060 Exhaust Manifold

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To remove the Exhaust Manifold, jack up the front of the car and support it on axle stands. Remove the bolts securing the manifold lower support bracket and disconnect the oxygen sensor wiring. Lower the front part of the exhaust and remove the heat shield. Unscrew the bolts and nuts securing the manifold to the cylinder head and carefully withdraw it. Recover the manifold gasket. When refitting, use new gaskets for the manifold-to-engine pipe and manifold-to-head joints. Use new nuts and clean the threads if reusing old studs and bolts. Tighten all fittings to the specified torque.

First of all, the catalytic converter is a device that reduces harmful exhaust emissions by converting poisonous gases into less harmful ones. It is made of a ceramic honeycomb structure coated with precious metals, which act as catalysts. The converter gets hot during the reaction and can be damaged by rough treatment or driving through deep water. To ensure its proper functioning and longevity, it is important to use unleaded petrol, maintain the ignition and fuel systems, avoid engine misfires, and not push or tow-start the car. Also, do not switch off the ignition at high engine speeds, use fuel or oil additives, continue using the car if it burns excessive oil, park in areas with high vegetation, or strike the converter during servicing. A blocked converter may cause a substantial loss of power.