Peugeot 3008 Intake Manifold Issue

Sounds familiar. I had similar symptoms with my old Opel Astra, though it was a petrol engine. Check for any hissing sounds around the manifold – that could be a sign of a gasket leak. Might be worth a quick visual inspection before diving too deep.

Thanks! When you mention 'hissing sounds,' is that easily discernible, even with the engine running? And when you say 'visual inspection,' what exactly should I be looking for? Any specific areas or components that are more prone to failure or leakage? I want to be as thorough as possible before taking it in.

Yeah, you should be able to hear it, even with the engine running, but it might be faint. Visually, look for any cracks, scorching, or oily residue around the manifold and where it connects to the engine. Honestly, with those symptoms and the mileage, I'd just take it to a workshop. Sounds like a proper intake manifold issue.

Thanks so much for your advice! I took your suggestion and brought my Peugeot to a trusted mechanic. It turned out that the intake manifold was indeed defective, with clear signs of scorching and leakage. The repair, including parts and labor, amounted to 1180€. While it was an unwelcome expense, I'm relieved to have the issue resolved. Your insights were incredibly helpful!