[DML] Re: Idle speed too high - other causes?
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[DML] Re: Idle speed too high - other causes?

Ok, I think I might be onto something here... or I'm just going crazy...
  It would appear that the little relief valves in the throttle plates
are in backwards.  I don't know how that would happen, but...
I've removed the throttle body and the "ram's horn" looking part of
the intake.  If I look into the throttle body from the end that
attaches to the fuel distributor I see the spring end of the relief
valves.  That means that the flat end is toward the engine vacuum.  If
I'm correct that means that vacuum is pulling these valves open.
  I've double checked to make sure that the throttle plates are in
correctly and the bevels of the plates seat nicely against the
throttle bore, and the plates are set the right direction.
I'm so confused...

Matt Smith

--- In dmcnews@xxxxxxxxxxxxxxx, "dmcchaser" <dmcchaser@xxxx> wrote:
> Hello all.
>   The idle speed on my D is too high ~1800 rpm warm.  I've read the
> "Discussions on Idle Speed"  and everything checks out.  The throttle
> plates are correct, idle switch and ISC system work, no vacuum leaks,
> the brass screws in the throttle body are fully seated, all o rings,
> gaskets and seals in the plenum are new.
>   I'm out of ideas for now and I'm hoping someone else can help.
> Could the backfire valves in the throttle plates be leaking?
> Matt Smith

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