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POOR FUEL ECONOMY Verify intake air is not restricted. Verify fuel pressure is within specification. Check ignition module. Check canister purge solenoid. Check vane air temperature sensor. Check vane airflow meter. Check heated exhaust gas oxygen sensor. EXHAUST SMOKE/ODOR Check vane air temperature sensor. Check vane airflow meter. Check exhaust gas oxygen sensor. FUEL ODOR/LEAKS Check evaporative emission control components. Check rollover vent valve. Check by-pass air control valve. FAILS EMISSION TEST Check canister purge solenoid. Check pressure regulator control solenoid. Check heated exhaust gas oxygen sensor. Check by-pass air control valve. INTERMITTENTS INTERMITTENT PROBLEM DIAGNOSIS Intermittent fault testing requires duplicating circuit or component failure to identify problem. These procedures may lead to computer setting If problem vehicle does not produce fault codes, monitor voltage or resistance values using a DVOM while attempting to reproduce conditions Use a DVOM to pinpoint faults. When monitoring voltage, ensure ignition switch is in ON position or engine is running. Ensure ignition TEST PROCEDURES INTERMITTENT SIMULATION To reproduce conditions creating an intermittent fault, use following methods: Lightly vibrate component. Heat component. Wiggle or bend wiring harness. Spray component with water. Remove/apply vacuum source. Monitor circuit/component voltage or resistance while simulating intermittent. If engine is running, monitor for self-diagnostic codes. Use test Copyright 2009 Mitchell Repair Information Company, LLC. All Rights Reserved.
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