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

Mine started idling exactly like this when I slightly bent the 
connecting arm between the accelerator cable spool and the arm that 
holds the idle microswitch. The bend wasn't visible but it had the 
effect of shortening the arm just enough to pull the butterfly valves 
open a hair, just as if I were applying a little throttle. It would 
idle between 1500 and 2000 no matter what I did.

With your engine idling, try pressing the idle switch arm towards the 
switch and see if the assembly moves a little more, enough that your 
idle becomes normal.  If so, there are notes in the tech section on 
resolving this problem. The arm is easily removed (one clip beneath 
the spool) and length-adjusted by screwing the end ball in/out as 
needed.  Wish I'd found the notes BEFORE I spent two days figuring it 
out myself. :)

Not saying this is it, but it was on my car!


--- 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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