Tip & How-To about Mercedes-Benz E-Class
1.6c) EGR errors and how to fix
How to check? With the engine running it may be possible to force the EGR valve open by pressing on the diaphragm on the underside with one's fingers. Alternatively, disconnecting the vacuum line to the EGR and applying a vacuum to it (even sucking on it with your mouth) will determine if the diaphragm is split. If the valve opens in response to vacuum check that the upstream vacuum control valve on the vacuum line is opening in response to ECU instruction. Disconnecting an electrical EGR and applying a switching voltage (9 volts) across the connecting pins will cause it to open and the idling engine should falter or stall as the pressure drops in the intake manifold. If the unit clicks open but the engine is oblivious to its effect then it is likely that the passageways to the EGR are clogged up. Removal of the EGR assembly and examination of the ports and valve mechanism will reveal any carbon build up.
How to fix? Determinefirst that the fault actually lies with the EGR and not with any ancillary solenoid used to block vacuum to the EGR or a faulty DPFE sensor (see below). If the diaphragm is split then the EGR needs to be replaced. Most EGR problems are linked to carbon soot build up and this can be cleaned using a cloth, metal pick, wire brush and carburetor choke cleaner spray. If the exhaust feeder pipe is blocked this can be cleaned using a piece of coat hanger wire or a piece of frayed hand brake cable fitted to a drill as a rotary brush to remove dirt from the interior, even around corners. Some cars, Hondas are a good example, have an elaborate passage-way system to provide EGR exhaust gas to each individual inlet pipe runner. Later, Honda, having become aware of the occasional need to remedy blockages, provided EGR passageway assemblies with removable lid sections to allow cleaning access.
NEXT 1.7) DFPE Differential Feedback Pressure Exhaust sensor
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