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SchwarzHarald

Twingo Turbo Whistle Power Loss

My 2013 Renault Twingo with a gasoline engine is acting up at 177096 km. The check engine light is on, power is way down, and the engine is super sluggish. There's a whistling noise that turns into a loud hissing when I accelerate. Sometimes it even stalls at idle, and it seems to be using more fuel than usual. I think it might be the turbo boost pressure actuator. Any ideas?

Summary of the thread

A 2013 Renault Twingo is experiencing power loss, sluggishness, a whistling noise turning into a loud hissing during acceleration, and increased fuel consumption, with the check engine light on. The suspected cause is a faulty turbo boost pressure actuator, which controls the turbo wastegate. The actuator arm should move freely; if stuck, it may indicate a defective actuator. A visit to a workshop confirmed a defective electrical bypass valve, which was replaced, resolving the issues.

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4 comment(s)

florian_vogel9

Those are concerning symptoms. A whistling noise, coupled with power loss and the check engine light, definitely points towards a turbo issue. The boost pressure actuator controls the turbo wastegate, which regulates the boost pressure. If it's faulty, it can cause all sorts of problems. Can you check the actuator arm for free movement? If it's stuck or very stiff, that would support your theory.

SchwarzHarald (community.author)

Thanks for the quick reply! When you say 'free movement', what exactly should I be looking for? How much play should it have? Also, what happens if it's not moving at all? Is that game over for the actuator, or is there a chance it can be freed up?

florian_vogel9

When I say "free movement," I mean the actuator arm should move smoothly and easily without resistance when you try to manipulate it. There should be a small amount of play, but it shouldn't be excessively loose. If the arm isn't moving at all, it's highly likely the actuator is seized or defective. While it might be tempting to try and free it up, if it's electrically controlled, the bypass valve might have failed internally. Considering the symptoms, and if the actuator arm is indeed stuck, I would recommend a visit to a trusted workshop to get a proper diagnosis and potential replacement. It's essential to rectify turbo issues quickly to prevent further damage to your engine.

SchwarzHarald (community.author)

Cheers for the advice! You were spot on. I took it to a garage, and they confirmed it was a defective electrical bypass valve. It cost about 250€ to get it sorted, but at least the Twingo's back to its old self. No more whistling, stalling, or excessive fuel consumption!

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RENAULT

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TWINGO