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horstwilson1

Trafic diesel rough running hissing sound

I'm having trouble with my 2020 Renault Trafic diesel. It's done 91759 km. Recently, I've noticed a significant drop in engine power, and the engine runs quite rough, especially when accelerating. There's also a noticeable jerking and a loud hissing sound when I put my foot down. Fuel consumption seems to have increased too. I suspect it might be related to the intake manifold flap control. Has anyone experienced similar issues?

Summary of the thread

A 2020 Renault Trafic diesel with 91,759 km exhibited rough running, reduced engine power, jerking, increased fuel consumption, and a loud hissing sound during acceleration. The suspected cause was a malfunctioning intake manifold flap control. After diagnosis, it was confirmed that the switch for the intake manifold control was defective. Replacing the flap control resolved the issues, restoring smooth engine performance.

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4 comment(s)

marthadark1

I had a similar problem with my Trafic, although I have petrol engine. The symptoms sound very familiar – reduced power, rough running, and a hissing noise. It could well be the intake manifold flap. Do you notice any difference in performance when the engine is cold versus when it's warmed up?

horstwilson1 (community.author)

Thanks for the quick response. To answer your question, the engine seems to run slightly better when cold, but the problems are still present, just maybe a bit less pronounced. Could you elaborate on what exactly was wrong with your intake manifold flap?

marthadark1

Okay, that sounds very much like what I experienced. The flap wasn't opening and closing properly, restricting the airflow. It’s difficult to diagnose without proper equipment. Given your symptoms, it's probably best to get it checked out by a workshop. They can properly diagnose the issue and confirm if it's the manifold flap or something else.

horstwilson1 (community.author)

Thanks a lot for the advice. I took it to a local mechanic, and after diagnosis, the switch for the intake manifold control was indeed defective, they quoted 465€ for the full repair. I got the flap control replaced, and everything is running smoothly again.

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RENAULT

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TRAFIC