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  #1  
Old 05-24-2011, 01:10 AM
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Join Date: May 2011
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EGR question (1991 350SD)

Do I really need it? If not, how can it be disconnected (i.e. can I just pull the line from the vacuum pump, thus disabling any vacuum to the EGR). Then remove the solenoids and replace the EGR with an aluminum plate.

If I do need it, how do I make sure it works well (at what vacuum should it open? Should it be cleaned? Should the solenoids be tested? etc.)

Thank you,

Vlad

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  #2  
Old 05-24-2011, 07:33 AM
compu_85's Avatar
Cruisin on Electric Ave.
 
Join Date: May 2008
Location: La Conner, WA
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It reduces NOx emissions. I think the computer can tell when it isn't working, and will set a fault code... but it doesn't affect driving at all.

-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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Old 05-24-2011, 01:57 PM
MPH MPH is offline
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In my 1991 350SDL I removed the valve and installed a copper disc on the exhaust side. I capped the vaccum line. This is for "testing purposes" only. I am conducting a very long test.
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Old 05-24-2011, 04:03 PM
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I'm conducting my own very long test. Disconnected the EGR @ vacuum pump (removed the 'Y'). No check engine light, the car still runs just as well (or better) then before ... this might turn into a very long test.

The way I see it, any simplification to a 20 year old engine is progress. Removal of vacuum lines, EGR solenoid, EGR valve, etc. makes for fewer places for something to fail, and cleans up the engine bay.

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