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Mercedes R Klasse diesel intake manifold issue

My 2008 Mercedes R Klasse diesel is jerking on acceleration. The check engine light is on, power is reduced, it runs rough, stalls at idle, and has a strong exhaust smell. Error memory shows engine misfire. I suspect an intake manifold leak. Has anyone seen this on this model?

The 2008 Mercedes R Klasse diesel is experiencing jerking on acceleration, reduced power, rough running, stalling at idle, and a strong exhaust smell, with the check engine light on and an engine misfire error. These symptoms suggest a potential intake manifold issue, possibly due to a leak or scorching. It is recommended to check manifold pressure readings and consider a professional diagnosis, as confirmed by a workshop identifying a defective intake manifold.

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4 comment(s)

A scorched intake manifold is a plausible cause for those symptoms on the R Klasse. Have you checked manifold pressure readings? A gasket leak could cause similar behavior, leading to engine performance issues and triggering the check engine light.

I haven't checked the manifold pressure specifically. Is a gasket leak common with these manifolds?

Gasket failure isn't unusual, but scorching of the manifold itself is also a known weakness. The error codes you are seeing likely point to a manifold problem. I'd advise taking it to a workshop for diagnosis.

The workshop confirmed the intake manifold is defective and estimated 1180€ to replace it. This aligns with what I suspected.

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MERCEDES

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RKLASSE