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Old 09-26-2009, 05:55 PM
Dark Matter
Join Date: Aug 2006
Location: Tri-Cities, WA; 100+/summers&20's/winter
Posts: 14
Vacuum Check Valve

Hello All,
I've been having trouble with my egr valve since way back when; yesterday, I bought some vacuum tubing by the foot and decided to replace all the old tubing up to the egr, and all under the hood as most of it was in pretty bad shape. I applied vacuum to the egr valve and audibly heard it click, so hopefully no problem there mechanically, other than it codes and doesn't seem to work when called for. While replacing tubing on the right side of engine, (facing engine compartment), I noticed a small circular valve with an inlet and outlet tube, and removed it to replace the tubing. Now, can someone tell me the correct orientation of this vacuum check valve as I think it's been installed upside down this whole time, (blue side up, black side with white numbering down), and if this has been the problem with the egr the whole time. If this is the case, it's just another reason to NEVER take it back to the local Mercedes dealer again, on top of the list of reasons I already have to never return. I'm still completing other retro-fits, and haven't started the car yet, so any input would be greatly appreciated.
E 320

Last edited by 94 E320; 09-26-2009 at 06:04 PM.
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Old 11-01-2009, 08:42 AM
lsmalley's Avatar
Registered User
Join Date: Oct 2006
Location: California
Posts: 2,133
what you need to do is blow through the valve.....whatever side allows you to blow through, that is the side you connect to where the suction is coming from for it is only a one way valve. If you are unsure of the suction, turn the engine on and place your finger over the tubes to see which one has the suction.
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Old 11-02-2009, 03:37 AM
wbain5280's Avatar
Registered User
Join Date: May 2001
Location: Northern Va.
Posts: 3,386
Most likely, all the EGR passages are clogged with soot.


Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL


Not part of the in-crowd since 1952.
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Old 01-20-2010, 08:17 PM
Dark Matter
Join Date: Aug 2006
Location: Tri-Cities, WA; 100+/summers&20's/winter
Posts: 14
Vacuum Check Valve

Thanks for the replies; the car however, let me know quite quickly that the connection was incorrect after a brief test start. When I checked the Diagnostic Module, the car reported that the data received was "implausible", and the vehicle was in "limp home mode"; so I returned the valve to it's original orientation and have had no further problems. On the bright side, the EGR valve now functions normally, and the check engine light has been OFF since I replaced the vacuum tubing.
94 E320

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