Re: [Chrysler300] WCFB sticking idle

["'czbill@xxxxxxxxxx' czbill@xxxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx>]

The AVS on our GTX started doing that, it turned 
out it had be worn shafts that apparently allowed 
a slight bit of friction between the throttle 
plates and the throttle bore on closing under vacuum.

Bill Huff


At 09:12 AM 6/19/2019, John Grady jkg@xxxxxxxxxxxxxxxxx [Chrysler300] wrote:
>
>
>I have a situation where a WCFB does not 
>mechanically return to the idle screw , but only 
>if the engine is running , with engine off no 
>vacuum all is perfect . Not a linkage Issue, 
>linkage off the carb. It takes literally 2x the 
>spring pull to return it fully and that is way 
>too much spring . Marshall Goodnight helped me a 
>lot with info that apparently our engines were 
>built by the marine division and some (!) have 
>Chrome plated throttle shafts , some are plain 
>brass. Marshall correctly believes plain brass 
>on pot metal has more friction . Thinking about 
>this if each throttle plate is 1sq in , and 14 
>lb vacuum we have like 25 lbs pressing down on 
>shafts at idle . That is a lot. Maybe someone 
>else has dealt with this ? It can fool you ( did 
>me) as it works perfectly with engine off, but 
>high or changing idle return stop with engine 
>running . Never saw this before ?ssomething is 
>different . Rebuilt carb by pro, no binding or sticking.
>Thoughts welcome ..
>thank you ,
>John
>
>Sent from my iPhone not by choice
>


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Posted by: "czbill@xxxxxxxxxx" <czbill@xxxxxxxxxx>
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