Category: Fuel & Emissions

Idle Control System Idle Speed Setting Inspection/Adjustment 1. Start the engine and warm it up to normal operating temperature (the cooling fan comes on). 2. Connect a tachometer. Connect a tachometer to loop of igniter unit secondary, or… 3. Disconnect the 2P connector from the EACV. EACV TACHOMETER IGNITER UNIT 4. Start the engine with […]

Exhaust Gas Recirculation (EGR) System The EGR system is designed to reduce oxides of nitrogen emissions (NOx) by recirculating exhaust gas through the EGR valve and the intake manifold into the combustion chambers. It is composed of the EGR valve, EGR vacuum control valve, EGR control solenoid valve, ECM and various sensors. The ECM contains […]

Fast Idle Valve Description To prevent erratic running when the engine is warming up, it is necessary to raise the idle speed. The fast idle air bypass valve is controlled by a thermowax plunger. When the engine is cold, the engine coolant surroun- ding the thermowax contracts the plunger, allowing ad- ditional air to be […]

Troubleshooting Self-diagnostic Procedures I. When the Malfunction Indicator Lamp (MIL) has been reported on, do the following: 1. Connect the Service Check Connector terminals with a jumper wire as shown (the Service Check Connector is located under the dash on the passenger side of the car). Turn the ignition switch ON. SERVICE CHECK CONNECTOR (2P) […]