I have a Mercedes GLK250 with the OM651 engine. I'm getting a code for excessive EGR flow and it sets at idle or during decel. We've tried a number of things, and the only fault left is a slight leak around a shaft in the EGR cooler bypass valve when smoke testing the intake. (Red arrow in photo.) I'm wondering if the manifold is under vacuum under those conditions and it could be drawing in air where we see the smoke. (It's a very small amount of smoke.)
Is there something we could spray on the area of the leak to see if it's being drawn into the engine? I was thinking propane? It would be easy of it were a gas engine...
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Puzzling problem with Mercedes OM651
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