Author Topic: throttle body adjustment. Butterfly bind.  (Read 920 times)

Paul99

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  • United Kingdom, England, Hampshire UK
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  • 230 SL White. 1966.
throttle body adjustment. Butterfly bind.
« on: December 21, 2023, 16:41:37 »
Just trying to stop the hunting on my 230.  Firstly making sure the butterfly is fully closing on the throttle body as part of the linkage tour. I note that what should happen is when FULLY closed, it should bind slightly when trying to reopen the butterfly.  I have adjusted it fully closed but it doesn't "bind" at all when opening.  Should it bind?  is it just a case of worn out?  Its the original unit, 140k miles. 


ja17

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Re: throttle body adjustment. Butterfly bind.
« Reply #1 on: December 22, 2023, 02:32:19 »
Something is probably holding the lever open. Disconnect the linkage rod going to the venturi. It might be holding it open. If yours is an automatic, make sure the elecrical throttle switch is not adjusted wrong and is holding it open. If you have a vacuum dashpot on the venturi, you might need to temporarily move it if it is holding the lever open. 
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback