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  #1  
Old 04-21-2007, 07:37 PM
FireWalkWell's Avatar
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Oil in Vacuum lines

I plugged the lines going to the two yellow door lock lines as a temporary solution to my door lock issues. When I did this I found oil in the lines.

My understanding is this is usually caused by a faulty vacuum diaphragm. My questions are... how do I test this? Also when I bought the car i found a brand new MB shut off valve in the trunk. Could this have something to do with the oil in the lines... indicating the PO knew about th issue?

How should I proceed to diagnose the issue and get the oil out of the lines?

By plugging the door lock lines have I reduced the space the oil has to travel thereby causing issues with other vacuum lines that will become more plugged because oil doesn't have as far to travel?

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Old 04-21-2007, 11:31 PM
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If you have oil in the door lock line it's probably caused by a leaky check valve on the vacuum pump. It's right where the main vac supply line attaches to the pump. Your shut-off valve may still work great, but it may be leaking a little oil as well. If you pull the ignition vac line off the shut-off valve and see oil then it is leaking oil. Which can eventually cause a problem. If the lines are clean then you don't need to worry about it.
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Old 04-22-2007, 12:19 AM
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It can also be a failed diaphram in the shutoff valve on the back of the IP.
Happened on my wagon. Went to the keyswitch first, then on from there. {and down on my leg }
Pull the brown line off the back of the IP and have a look in it.

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