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Old 11-22-2014, 03:06 AM
marko606's Avatar
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Join Date: Nov 2012
Location: Las Vegas, Nevada
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1998 e300 turbo diesel low egr vacuum

I'm having a problem with low vacuum at egr valve. All rubber hoses were replaced. At the egr valve and on the turbo side. When measured, vacuum holds at 5 mmHg at idle at the egr transducer... 15-20 mmHg is needed to open egr valve. There is 25 mmHg vacuum at the brake booster. There is good vacuum just not at egr or waste gate transducers. Vacuum line t's off into the firewall on passenger side. Vacuum diagram in the engine compartment states "other users" for that line. Where does that line go? My ac has been acting strange too. I am puzzled and tired. Don't feel like pulling my dashboard out just yet. Please help... Thanks.
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Old 11-22-2014, 07:30 AM
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Join Date: Oct 2011
Location: Columbia, SC
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The "other users" on a 210 are the climate control damper actuator pods. There is a "harmonica" valve behind the dash, that controls the pods. I suspect you have a leak in the climate system. I think you can pull the glove box liner and find the harmonica like you can in a 124. Then it's time to break out the MityVac.

I suspect if you cap off the line heading to the passenger compartment your EGR function will return to normal.

The 210 does not use vacuum to run the transmission like earlier models, it is all electronically controlled from the computer.

Door locks and rear headrest dump come off the PSE pump under the back seat on a W210.
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Old 11-24-2014, 12:47 AM
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I appreciate that info. I'll look at it and report after I'm done replacing the steering rack.
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