[W126 Coupe] Re IDLE AIR VALVE PIPE WORK"IS YOURS LEAKING"?

[Dan Gardner]

Since I have got my car running again I have noticed the idle speed has
increase from 750rpm to 1200rpm,I have cleaned the idle air valve with carb
cleaner and removed a lot of black carbon,having viewed the archives It
would appear to have developed a vacuum leak or the  idle air valve has
changed since cleaning.
    I have removed the valve and the associated rubber hoses blocked them 
off and applied a Mityvac,and it leaked vacuum like a sive.
    The valve connecting tubes had casting burrs which I removed with a fine 
file and polished,but this did not fix the leaks.
    The hose are still quite soft,options are 1,new hoses,2 use a sealant,3 
use hose clamps where possible.

    Has anyone tried this test?what worries me is the dust that must have 
followed the vacuum leaks,
    The pipework is so critical that I am disappointed MB did not use clamps 
on all the connections and as for the 45deg plastic connecting pipe it could 
have been designed better.If anyone has used a better system or has any 
fixes I would be interested.

   .



Kind Regards  Dan Gardner    1986 560 SEC euro 220kw(300HP)




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