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-   -   SLK/R170: Frequent check-engine light and limp-mode, especially on bump roads - solution. (https://mbworld.org/forums/slk-class-r170/711462-frequent-check-engine-light-limp-mode-especially-bump-roads-solution.html)

Jaron 06-21-2018 12:07 AM

Frequent check-engine light and limp-mode, especially on bump roads - solution.
 
I don't remember if I've posted this before, so excuse me if I have.

When I first got my SLK320, I kept getting a check engine light and the car would go into limp-mode, usually if I hit any kind of bump on the road.

The connection between the air box and the throttle body was dry-rotted, and bumps in the road would open a gap allowing un-metered air in.

To fix this, I cleaned one surface and made a thick seal with sensor-safe silicone, then greased the surface it mates to and gently put the air box back on. After a day or so to finish out-gassing, presto: New air boot and no more check-engine and limp mode.

The air box can be removed and put back on entirely without tools--possibly part of why the boot is a vulnerable to failure--but it does make this fix easy to implement.

BeachFreak 02-09-2019 02:48 PM

Thanks for sharing!


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