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#1
06-23-2002, 08:43 PM
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What in the world is this little valve for???
On my 83 300SD there is a small electronicly controled vaccum valve on the firewall above the injection pump - it's not hooked up but what is it for??? I can't find any loose lines and I will try to get a digital camera out here to take a few shots of it - any ideas??
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4 
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#3
06-23-2002, 10:31 PM
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Probably the overboost connection, which has been disconneted and bypassed. A photo would help though.
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Check out my website photos, documents, and movies!
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#4
06-24-2002, 02:03 AM
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It's definatley not the overboost valve - it better not be... I will try to get a picture as soon as I can for you guys
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4
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#5
06-24-2002, 05:39 PM
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Pictures of valve:
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4
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#7
06-24-2002, 07:49 PM
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What is the overload relief valve for? Do you mean overboost valve? should I hook this sucker back up?
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4
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#8
06-24-2002, 08:01 PM
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Yes it's the overboost switchover valve. It vents the ALDA to the atmosphere while disconnecting the signal from the intake, to kill fuel enrichment. You should hook it back up as long as it is not plugged, which may be why it was disconnected in the first place. If it's plugged you can replace it.
HTH,
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Check out my website photos, documents, and movies!
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#9
06-24-2002, 08:06 PM
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ok I will run tests on this valve tommrow then - I dont like engine saftey features being bypassed! - thanks for your input - William
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4
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#10
06-26-2002, 03:39 PM
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In my case, the valve was good but the switch on the intake manifold that actuates the valve was stuck. If you can blow air through the fittings of the valve when the engine's off or the electrical connector is removed, the valve is probably okay.
Sixto 91 300SE 87 300SDL 81 300SD (sold)
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#11
06-26-2002, 11:09 PM
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Everything checked out with the valve so it's back in operation
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4
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