Cleaned both flaps and checked vacuum lines for leaks. Neither flap pods will hold vacuum -- they slowly bleed down. They both do it at the same rate leading me to reckon they are engineered to do so.

What say you 210 resonance flap experts? Yes? No? Are my flaps terminal? Has anyone tried to repair the vacuum pods for these?

Thanks in advance.

__________________
1998 E300 +310,000K
1996 E300 +460,000K

Hi Bill, I believe these are controlled by PCM signals so they get a fairly constant supply of vacuum and in practice, should maintain position even with the bleed down.

It would be interesting to have the owner of similar vehicle perform the same test for comparison. Mine's a 98 so no flaps.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

Seems to me I once tested the flap pods on my '96 E300D (W210, OM606NA) and they held vacuum just fine. But that was a while ago and I can't repeat the test until the car returns from the body shop in a few weeks.

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Bill I believe they are supposed to hold vacum. I did that test on that car once but like others it was some time ago and cannot recall with certainty what the results were.

__________________
Keith Schuster
2006 E350 98K miles
2013 Ford Explorer 15K miles

Well crap. Maybe my connection to the MityVac was leaking.

Getting some injector return line this am to button her back up. She was doing the resonator flap dance at 45mph. I'll post back how she runs with clean flaps and a new EGR bypass.

__________________
1998 E300 +310,000K
1996 E300 +460,000K

They hold vacuum.

Check the rubber lines. I had new lines leak vacuum even though it looked like they fit well. They've got to be the right ones for the rubber-to-plastic connection at the actuator.

__________________
Mark in MA
05 MB E320CDI 402k Granite Grey Metallic
05 MB E320CDI 267k Black
05 MB E320CDI 232k White
05 MB E320CDI 209k Tectite Grey
99 Dodge 2500 Cummins 5sp 148k
62 Jeep CJ-6 120k

Tested straight to the flap -- no lines. Tested my lines separately -- they're good.

Car drives wonderfully now.

Hmm.

__________________
1998 E300 +310,000K
1996 E300 +460,000K