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Old 06-03-2006, 01:22 AM
Bondavi's Avatar
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Join Date: Feb 2005
Posts: 316
EGR vacuum line on Euro 500's, from throttle body switch OR other?

On a euro 500 (federalized for US), does the vacuum line to the EGR valve come from the throttle body inside the engine valley or does it piggy back on another vacuum line anywhere? If it piggybacks, I assume the EGR line is plugged.

In full euro trim, would the throttle body switch lead directly into the EGR? I've seen some cases where EGR piggybacked into the charcoal canister vacuum line coming off the top manifold.

My instinct is to stay with the throttle body switch, but if smog results would be better with a "temporary" shift elsewhere for the EGR vacuum line, I'd like to know.

Also one of the outlets on the throttle body vacuum switch states it leads to the "warm up reg - lower chamber", I assume to connect DIRECTLY to the lower chamber itself?


Last edited by Bondavi; 06-03-2006 at 01:31 AM.
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Old 06-05-2006, 08:11 AM
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Join Date: Jun 2004
Location: brisbane,Qld.Australia
Posts: 2,062
There are dozens of variations on this hose theme,but you are pretty right on the money,the EGR is connected to the throttle body "switch" but on some W126's it's also connected to a idle change over switch on the left hand inner fender which in turn activates (at idle) a smog pump with clutch under the alternator.
As you can imagine,all this complexity only works at idle,so lean out the mixture for the test.....

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