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Discussion Starter · #1 ·
My wife's car (2009 SLK350) is making a weird noise upon acceleration. It almost sounds like she put a lower octane or bad gas in her car. However, the gas is not the issue. When you step on the gas there is this hesitation/flutter noise that occurs. There is a very slight knock in the engine as well upon acceleration. I'm thinking this could be an EGR valve. However, she is not receiving any dash error lights at all. Has anyone experienced this in their SLK350?
 

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There's no EGR system on the 350, exhaust gas scavenging is achieved using variable camshaft timing. I'd check for the tumble flap problem on the inlet manifold to start with.
 
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