Safrane diesel power loss and hissing sound

Sounds like what happened to my Safrane. Hissing, jerking, the whole thing! Checked the intake system for leaks or blockages? Hissing suggests a leak. Could be the manifold flap actuator. Throwing any engine codes?

Thanks! Haven't checked for leaks specifically, but the manifold flap actuator looked okay. No engine light, so no codes. Where was the leak on yours?

No engine light is a pain! Mine didn't throw a code until it was really bad. Couldn't pinpoint the leak myself. Took it to a workshop, and they diagnosed a defective switch intake manifold control. Needed a new part, cost around 465€. Smoke test is your best bet; that will show any intake system leaks.

Thanks for the advice. I suspected as much. Looks like a workshop visit is in order. I'll post the diagnosis when I have it. Cheers!