Auto Repair Manual Free Download and ReviewsFree download ebook pdf files automotive manual

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Some customers of 2001-02 Chevrolet Impala, Monte Carlo; Pontiac Grand Prix; and Buick Regal model vehicles, equipped with a 3.4L (RPO LA1 – VIN E) or 3.8L (RPO L36 – VIN K) V6 engine, may experience a condition where the vehicle exhaust catalytic converter is replaced due to complaints of lack of power or illumination of the Malfunction Indicator Lamp (MIL). This may be due to the front endcone insulation from the catalytic converter breaking away and blocking the front of the first catalyst brick and preventing the free flow of exhaust gas through the converter. SPECIAL POLICY ADJUSTMENT This special policy covers the condition described above for a period of 10 years or 120,000 miles (190,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. The repairs will be made at no charge to the customer. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after September 15, 2005 are covered by this special policy and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to September 15, 2005 must be submitted to the Service Contract provider. VEHICLES INVOLVED Involved are all 2001-02 Chevrolet Impala, Monte Carlo; Pontiac Grand Prix; Buick Regal model vehicles, equipped with a 3.4L (RPO LA1 – VIN E) or 3.8L (RPO L36 – VIN K) V6 engine and built within the following VIN breakpoints:

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The A/F sensor is a planar dual-cell limit current sensor. The sensor element of the A/F sensor is the combination of a Nernst concentration cell (sensor cell) with an oxygen-pump cell, which transports ions. It has a heater in the element. The sensor is capable of precise measurement lambda = 1, but also in the lean and rich range. Together with its control electronics, the sensor outputs a clear, continuous signal throughout a wide lambda range (0.7 < lambda < air). The exhaust gas components diffuse through the diffusion gap at the electrode of the oxygen pump and Nernst concentration cell, where they are brought to thermodynamic balance. An electronic circuit controls the pump current through the oxygen-pump cell so that the composition of the exhaust gas in the diffusion gap remains constant at lambda = 1. Therefore, the A/F sensor is able to indicate air/fuel ratio by this pumping of current. In addition, a heater is integrated in the sensor to ensure the required operating temperature of 700 – 800 ° (1,292 – 1,472 ° . C F) On Board Diagnosis Logic DTC Confirmation Procedure NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11 V at idle. WITH CONSULT-II 1. Start engine and warm it up to normal operating temperature.

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Theory of Operation The State of Change (SOC) catalyst monitor uses the signals from both the upstream and downstream O2 sensors to detect aging of the catalyst. Based on the fact that when a catalyst ages, it loses some of its Oxygen Storage Capacity (OSC). As a result, part of the untreated exhaust gases can breakthrough the catalyst and causes the downstream O2 sensor to deviate from its neutral (Stoichiometric) position. By observing the activities in the downstream O2 signal, the degradation level of catalyst can be detected. In general, the higher the downstream O2 sensor SOC value, the more exhaust gas breakthrough and the lower the OSC of the catalytic converter. WHEN MONITORED The monitor will run at between 1400 and 2300 RPM . It also runs between 40 and 70 KPA . SET CONDITION If the final State of Change index is within the calibrated fail threshold. Two trip fault. Three good trips to turn off the MIL

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1. Release fuel pressure. See FUEL PRESSURE RELEASE. Drain coolant. Disconnect all necessary coolant hoses, electrical connectors, vacuum hoses, fuel lines and control cables. 2. Remove generator and mounting bracket. Remove intake air duct hose. Remove upper radiator hose. Remove front Exhaust Gas Recycle (EGR) hose from intake manifold. Remove 2 intake manifold plenum supports between intake manifold and engine block. See Fig. 6. 3. Remove intake manifold bolts and remove intake manifold. See Fig. 5. To install, reverse removal procedure. Tighten intake manifold bolts to specification in sequence. See Fig. 7 and Fig. 8 . See TORQUE SPECIFICATIONS.

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Component Description The heated oxygen sensor 2 (rear), after three way catalyst (Manifold), monitors the oxygen level in the exhaust gas on each bank. Even if switching characteristics of the heated oxygen sensor 1 (front) are shifted, the air fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2 (rear). this sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1 V in richer conditions to 0 V in leaner conditions. Under normal conditions the heated oxygen sensor 2 (rear) is not used for engine control
operation.