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paulaschubert3

Grandeur Diesel Intake Manifold Flap Issue

My 2010 Hyundai Grandeur diesel is giving me fits. It's got about 71k km on the clock. Lately, I've noticed a serious drop in power, the engine runs rough, and it jerks like crazy when I try to accelerate. Plus, there's this loud hissing sound when I put my foot down, and my fuel consumption has gone through the roof. I'm pretty sure it's something to do with the intake manifold flap control – feels like it's not opening or closing properly. Anyone else had this?

Summary of the thread

A 2010 Hyundai Grandeur diesel experienced a significant drop in power, rough engine performance, jerking during acceleration, a loud hissing sound, and increased fuel consumption. These issues were suspected to be related to the intake manifold flap control not functioning properly. A similar case confirmed that the problem was due to a defective intake manifold flap control switch. The issue was resolved by replacing the faulty switch, restoring the vehicle's performance.

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4 comment(s)

victoriawolf1

Sounds familiar. I had similar symptoms on my Grandeur. Reduced power, rough running, all that. Check your intake manifold. That flap control can be a real pain. Does it feel like a misfire when accelerating?

paulaschubert3 (community.author)

Yeah, it does feel like a misfire sometimes, especially at lower RPMs. What exactly went wrong with yours? Was it just the flap itself, or something else in the intake system?

victoriawolf1

Pretty sure it was the switch for the intake manifold control on mine. Honestly, I didn't mess with it too much myself. Just took it to the shop. They confirmed the issue pretty quickly. Best to get it checked before you cause more damage.

paulaschubert3 (community.author)

Thanks! I took it to a mechanic, and you were spot on. The intake manifold flap control switch was indeed defective. Cost me 465€ to get it sorted, but at least it's running smoothly again. Appreciate the advice!

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HYUNDAI

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GRANDEUR