Jumpy Whistling Hissing Loss of Power

I've got a 2010 Citroen Jumpy gasoline with about 124k km on the clock. Recently, the check engine light popped on, and I'm getting seriously reduced engine power. Acceleration is sluggish, and there's this weird whistling sound, almost like a boost leak. When I accelerate, I can hear some loud hissing noise and the engine stalls sometimes at idle. Fuel consumption has also gone up! I'm thinking it might be turbo-related, maybe something to do with the boost pressure actuator? Anyone experienced something similar?

4 comment(s)

Sounds familiar. I had a similar issue with my Jumpy a while back. Have you checked the electrical bypass valve? It could be defective and causing a boost leak. Same symptoms: whistling, hissing, and loss of power.

Interesting! Where is that valve located, and is there any way to test it without special tools?

It's usually near the turbo, but honestly, accessing it can be a pain. I wouldn't recommend messing with it unless you really know what you're doing. In my case, it turned out to be a faulty actuator. The garage confirmed after a smoke test and replaced it. Best to get it checked by a professional to be sure.

Thanks for the advice! Took it to a shop, and you were spot on. They confirmed a defective electrical bypass valve. Replacement cost me around 250€, but power is back to normal now!

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