Freelander Diesel: Hissing + Power Loss = Swirl Flaps?

Hey there! I've got some experience working on cars (not a pro, but I've dealt with my share of issues). I had a very similar problem with my 2012 Land Rover Discovery 2.2 diesel, and those symptoms sound really familiar, especially that hissing sound and rough idle. Mine turned out to be a faulty intake manifold control switch, just like you're suspecting. Had to get it fixed at a workshop and it set me back about 465 Euro, but it sorted all those issues, the jerking, power loss, and that annoying vibration all went away. Before you head to the shop though, what's your mileage like? And have you scanned for error codes? Would be helpful to know if you're getting any specific codes to confirm if it's the same issue. Also, have you noticed any change in fuel consumption lately? Feel free to share more details about your Freelander, and I can tell you more about what to expect during the repair process.

Thanks for sharing your experience! My Freelander just hit 158447 KM and had its last service about 4 months ago. I actually noticed the fuel consumption getting worse over the last few weeks. Haven't scanned for codes yet, but planning to do that tomorrow at my 's place, he's got a diagnostic tool. Really appreciate the heads up about the intake manifold control switch. That repair cost sounds about right, and honestly, I'd rather fix it now than risk bigger problems down the road. Did you have to wait long for the parts when you got yours fixed?

Hey again! Good to hear back from you. Yeah, those symptoms with increasing fuel consumption definitely sound similar to what I experienced with my Discovery. When I got mine fixed, the parts took about 3-4 days to arrive, not too bad really. Just to share more from my experience, before I got it fixed, I tried driving it very gently for a while, but the problems just got worse. The hissing sound became more noticeable, especially during acceleration, and the jerking got really annoying in stop-and-go traffic. Getting the diagnostic codes is definitely a smart move. When I scanned mine, it showed P2008 and P2009 codes, which confirmed the intake manifold runner control circuit issue. Keep an eye out for those codes when you do your scan tomorrow. One thing I'd mention, while you're waiting for the repair, try to avoid hard acceleration as it puts extra stress on the system. My mechanic told me this could potentially cause more damage to other components. Let me know what codes you get from the scan. If they're the same as what I had, I can give you more details about what to expect during the repair process. From my experience, once it was fixed, the car ran like new again, totally worth the investment!

Thanks again for all the detailed help! Just got back from scanning the car at my 's place, and guess what, got the exact same codes you mentioned (P2008 and P2009)! That really confirms what we suspected about the intake manifold control switch. I've already called a few shops and found one that can take it in next week. They quoted roughly the same price range you mentioned, and said parts should arrive within 3-4 days. Until then, I'll definitely follow your advice about avoiding hard acceleration. Really grateful for you sharing your experience, it's saved me a lot of worry and helped me understand exactly what I'm dealing with. I'll update once it's all fixed, but feeling much more confident now about getting this sorted. Thanks for walking me through this!