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#1
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I have a '77 240D which will not maintain vacuum when doors are locked. If doors are not locked, vacuum is maintained without a problem.
So far, I have: -Replaced vacuum pump diaphram. I pumps @22" of vacuum -Checked blue and black check valves under the hood, they hold. -Replaced Master Vacuum Valve, Driver Door. -Checked diaphrams in all three other doors, discovered no leaks. -Put all night test on vacuum tank-it's good. -Tested gas flap and trunk diaphrams-they hold as well. -Replaced 3-way and 4-way vacuum fittings under the hood. I have been to my usual mechanic, who can not figure it out. The local dealer was also no help. What am I missing? I think there is a checkvalve I am missing. I need help, if I can diagnose it, I can fix it. |
#2
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Have you looked at the vacuum reservoir? It can leak as well.
------------------ Benzmac: ASE CERTIFIED MASTER AUTO TECHNICIAN SERVICE MANAGER FOR 14 BAY FACILITY MERCEDES SPECIALIST 8 YRS PARTNER IN MERCEDESSHOP.COM |
#3
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I did check the vacuum tank, which I believe is the vacuum resevoir mentioned in the last reply. Please let me know if there is more than one tank/resevoir.
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#4
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20 year old rubber diaphrams can & do leak so try pulling vacuum on the elements a little bit at time(slowly). Try blocking off part of the system(overnight) by capping off the yellow/red vacuum lines at the "t" areas.
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