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Frequent check-engine light and limp-mode, especially on bump roads - solution.

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SLK-Class (R170) 1998-2003: SLK 200, SLK 230K, SLK 320

Frequent check-engine light and limp-mode, especially on bump roads - solution.

 
Old 06-21-2018, 12:07 AM
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2001 SLK320, 2001 ML320
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.

Last edited by Jaron; 06-21-2018 at 12:14 AM.
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Old 02-09-2019, 02:48 PM
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cruze
Thanks for sharing!
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