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  #1  
Old 10-16-2003, 10:29 PM
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Question Should the EGR valve hold a vacuum?

This might sound like a dumb question, but should the EGR valve hold a vacuum? Mine will operate when I attach my mighty vac, but then it quickly leaks out the vacuum and the valve closes. Should I replace it? Will it make a difference that's worth the $140 cost of a new one? As a side note, the car did come close to failing emissions in January.
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Old 10-16-2003, 11:00 PM
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Forgot to mention, the car is a '91 190e 2.3
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Old 10-17-2003, 12:10 AM
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Speaking in " generic " terms, yes an EGR valve should hold vacuum
Does it hurt to have it not working ?
I have seen many vehicles suffer poor fuel economy, because the EGR was not working ( long story ).
Chances are, down the road you will fail an e-test.
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  #4  
Old 10-17-2003, 12:22 AM
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I *think* it's working, since when vacuum is applied it does open, but it's just that the vacuum leaks out. If there's an endless suppply of vacuum available, I guess it'd be ok, except for the slight vacuum leak, whick of course, is not ok.
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Old 10-17-2003, 12:56 AM
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The one in my 91 300SE holds a vacuum.

As far as emissions testing, you probably won't fail a sniffer test, but most California tests include applying a vacuum to the EGR valve and checking for a dip in RPM. You might fail that part of the test if they do it where you live.

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95 S420
91 300SE
87 300SDL
83 300SD
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Old 10-17-2003, 01:04 AM
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Ah, interesting. It is a California model, however I'm currently residing in Arizona. heh Anyway, I think I'll go ahead and replace it sometime before my next emissions test.

Thanks for the info guys!
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