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Originally Posted by Number_Cruncher
Thanks for the web link. It's very helpful.
If the schematic shows the valves in their correct orientation relative to the engine, then that's how I currently have the pipes plumbed in.
I've searched the site for resonance valves, without finding anything appropriate - does anyone know how and when, under what engine operating conditions these resonane valves should operate? I'm thinking of running some thin wires and leds, so I can tell when the vacuum solenoids are energised, but as yet, I wouldn't know if they were working correctly or not.
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pimpernell here, 96e300d, another poster provided this information....hope this is helpful
Resonance Intake Manifold: From CTP to 2550 rpms, both 99/2 (Intake Line Flap-middle of long intake pipe on top) & 99/4 (Intake manifold flap) are closed. From 2550 rpm to 3350 rpm, 99/2 opens & 99/4 stays closed. 3350 & up both are open.
* In viewing a 124 chassis 606 engine, the above was true.
* In viewing the 210 chassis 606 engine that I am working on, I found the opposite happening from 2550 to 3350. 99/4 would open and 99/2 would stay closed. All electrical connections seemed factory. I swapped the vac lines at the swithover valves, Y22/6 & Y22/7, to generate the operation the book calls for and the car runs much better and more pep.
You might know the Mercedes HHT showed 99/2 opening when it really was 99/4 opening before the swap.
* Here's the kicker, another 210 Chassis 606 rolled in for an oil service and it was doing the same thing. I don't know if I have found a true MB foul up or not.
Could this community with the 210 Chassis 606 engine look to see how there resonance flaps are working? This is very hard to put into print and know if I have described what I have found in an understandable way or confused everyone.
Thanks, Michael