erikice1

S40 Reduced Power Rough Running

My 2001 Volvo S40 diesel is giving me seriously reduced power, the engine runs rough, and it's jerking like crazy when I accelerate. There's also this loud hissing noise when I put my foot down, and my fuel consumption has gone through the roof! A friend suggested it could be something to do with the intake manifold flap control. Anyone else had this?

The 2001 Volvo S40 diesel is experiencing reduced power, rough running, and increased fuel consumption, accompanied by a loud hissing noise during acceleration. These symptoms suggest a potential issue with the intake manifold flap control. A faulty switch for the intake manifold flap control is identified as a likely cause. The recommended solution is to have the vehicle inspected and repaired at a workshop, which resolved the issue for another owner with similar symptoms.

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4 comment(s)

I had a similar problem with my S40. Reduced power and rough running were the first signs. Does it feel like an engine misfire? I eventually traced it back to the intake manifold flap. Is it throwing any error codes? A faulty switch for the intake manifold flap control could be the culprit.

Misfire is a good way to describe it, yeah. I haven't checked for codes myself, to be honest. Where exactly is this switch located, and is it something I could potentially fix myself?

While I understand your inclination to attempt a self-repair, diagnosing intake manifold issues can be intricate. A defective switch for the intake manifold flap control does align with the symptoms you've described. Given the potential complexity, and considering my own experience, I would recommend a visit to a reputable workshop. It cost me 465€ to have it sorted.

Thanks for the advice! Sounds like I'm dealing with the same gremlin. I'll bite the bullet and take it to a workshop. Turns out it was indeed the intake manifold flap. Got it fixed for 465€, just like you said! Runs like a dream now.

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VOLVO

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S40