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Seat Altea Diesel Engine Power Loss

My 2004 Seat Altea diesel is giving me grief. Mileage is at 146708 km. Experiencing reduced engine power, rough running, and a noticeable jerking when accelerating. There's also a loud hissing sound when I put my foot down, and fuel consumption is up. Suspect it might be the intake manifold flap control. Anyone seen this before?

4 comment(s)

I had a similar issue with my Altea! Reduced power, engine misfire, the whole thing. Have you checked the airflow control system? Specifically, look for any hissing sounds near the intake manifold when you accelerate. That's a classic sign of a leak.

Interesting. When yours had that issue, were you getting any engine light warnings? And did you notice increased fuel consumption?

Yeah, the engine light came on eventually. And definitely saw a spike in fuel consumption. It sounds like exactly what I experienced. If it’s hissing and you’re losing power, I'd strongly suspect the intake manifold flap control. I'd suggest getting it checked by a workshop. They'll be able to confirm with diagnostics.

Turned out to be the intake manifold flap motor as I thought. Cost 465€, but the Altea is running smoothly again.

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