Boxer EGR Valve Symptoms

Greetings. Your symptoms do align with a potential EGR valve issue. I encountered similar problems with my Volvo V70. Reduced engine power and a check engine light are often telltale signs. The hissing sound may indicate a vacuum leak. Did you check for any fault codes using an OBD2 scanner? That might provide more specific information.

Thanks for the reply! An OBD2 scanner is a good shout - I'll try that. You mentioned a vacuum leak; where would I even start looking for something like that? Is it difficult to spot?

A vacuum leak can indeed contribute to these symptoms. Begin by inspecting all vacuum hoses connected to the intake manifold and EGR valve. Listen for hissing sounds while the engine is running. A smoke test, often conducted by automotive technicians, can precisely pinpoint leaks. However, given the array of symptoms, the defective EGR valve is most likely. If replacement doesn't address it, checking the catalytic converter might be the next step, as that also influences vehicle emissions. It is advisable to go to the workshop.

Appreciate the advice. I ran the OBD2 scanner and it pointed towards the EGR valve. Took it to a mechanic, and you were spot on – the EGR valve was jammed solid. They replaced it for 355€, and it's running like a champ again. Thanks!