IMHO they are staying open when they should be closed. You are getting
more air into the mixture than you should be and that's causing your
high idle RPM. And you're not getting engine braking because the intake
manifold vacuum (should get up to 22-23 inches Hg and then the bypass
valves open) isn't high enough because the valve is open all the time.
My advice is to pull them off, clean them so that the valves move, check
the gaskets for breaks (that could be the problem too) and replace them
without turning the adjusting screws. Worth a try. Some people cut
gaskets to plug them off, but if you can make them work it makes for
cleaner combustion. Bentley's manual has a method for setting them but
that's best saved for a later post.
Bud
71TR6 CC57365
71TR6 CC65446
66TR4A CTC57806
Beth and Ken wrote:
>
> "IF" these guys are the problem behind my low breaking and high RPMs when
> hot...is it because they are shut when they should be open, open when they
> should be shut, leaking...what?
>
> How do I do the diagnosis here gents?
>
> ken shapiro
> baltimore
> 1970 GT6+ KC81872L
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