P0171 and broken vacuum hoses - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 10-30-2017
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P0171 and broken vacuum hoses

Fixing the P0171 error I found 3 vacuum hoses broken and disconnected. I need help in figuring out how to connect these. The attached picture (from my 2003 SLK 230) shows the line from the Change Over Value (light green), a transparent tube going into the firewall (pink) and a rubber hose from the intake manifold (orange). The image of the Vacuum Map on the inside of the hood, does not describe all the lines. Is it missing a "Y" connector, a check valve, etc. Any help or a picture would be greatly appreciated.
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File Type: jpg Vacuum Map.jpg (87.4 KB, 8 views)
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#2 Old 10-30-2017
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on my 1999, there are 2 ports on the back of the intake manifold. one Y'd off to the fuel pressure regulator and underneath the intake manifold where it Y's off again and goes into the bottom of the intake port's on the head. the other one went up towards the front of the engine to the supercharger if I recall.

however your 2003 may be different.
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#3 Old 11-01-2017
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Any more 170 owners with tips?

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#4 Old 11-01-2017
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It seems that the emission parts are on the decal, but there is (at least on the Euro models) also a vacuum system that moves the headlights up/down. The transparent, pink tube that goes thr'u the firewall may be for the headlight servo - a valve behind the marked 0-3 Wheel. The line goes from the vacuum connection, to near the light switch, then back, and "Y"-ed off to both headlights. Any leak in that line will make headligt movement impossible.
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