Jumat, 12 Juli 2013

How to Test a Digital EGR Valve

Exhaust gas recirculation (EGR) valves are present in most engines and prevent the build up of nitrogen oxides within your exhaust by recirculating a portion of the exhaust gases into the engine. Nitrogen oxides are pollutants which pose environmental hazards. There are many types of digital EGR valves which operate in different ways. Some of these different operating methods include single-stage, multi-stage and linear. Consequently, there are also different methods of diagnosing a faulty digital EGR valve.

Instructions

Non Back-Pressure-Sensing EGR Valve

    1

    Disconnect the vacuum hose from the EGR valve by removing the clamp that secures it.

    2

    Attach the hose from the vacuum pump to the port you just disconnected and secure the hose with a hose clamp.

    3

    Start the engine, allow it to warm up and then start the vacuum.

    4

    Monitor the EGR valve as the engine warms up. When the valve opens, listen for a drop in engine idle speed. You will know the valve is open because the vacuum line will start pulling. If there is no drop in idle speed when the valve opens, the valve is faulty.

Back Pressure-Sensing EGR Valve

    5

    Disconnect the vacuum hose from the EGR valve by removing the clamp that secures it.

    6

    Attach the hose from the vacuum pump to the port you just disconnected and secure the hose with a hose clamp.

    7

    Start the engine, allow it to thoroughly warm up and then start the vacuum.

    8

    When the valve opens, listen for a drop in engine idle speed. You will know the valve is open because the vacuum line will start pulling. If there is no drop in idle speed when the valve opens, the valve is faulty.

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