Ikon diesel intake manifold issue

I also drive an Ikon with a diesel engine. Your symptoms sound eerily familiar to an issue I had a while back. The hissing, the jerking, and the power loss... it all points to the intake manifold. Have you checked for any error codes? Can you describe the hissing sound in more detail? Does it happen only under heavy acceleration, or even with light throttle input?

I haven't checked for error codes yet. The hissing is most noticeable under heavier acceleration, particularly when trying to overtake. With light throttle, it's barely audible. Could you elaborate on your experience? Did it definitively turn out to be the intake manifold flap?

Yes, in my case, it was definitely the intake manifold flap control. The symptoms match yours perfectly. While it could be something else, I'd strongly advise getting it checked out by a competent mechanic. Continuing to drive it like that could potentially cause more damage. A proper diagnosis is essential. It might be a simple fix, or it might require replacing the whole manifold – better to know for sure before things get worse.

Based on your advice, I took my Ikon to a workshop. The diagnosis confirmed it: defective intake manifold control switch. The repair cost me 465€, but the engine is running smoothly again. I appreciate you pointing me in the right direction!