V8 idle speed

The idle speed on my Discovery is very eratic, almost feels like it going to
stall sometimes. I have taken out the idle stepper motor and cleaned it but
its still the same.
I did read somewhere that if I disconnect the plug with the engine at idle
the speed should increase to approx 2000rpm. Can anyone confirm if this is
correct? How can I test it? If I need a new one, how much is it likely to
be?
When switched to lpg its lovely and smooth.
Thanks
Richard

You think you have problems, the idle speed for me depends upon my ability
to keep my heel on the brake and my toe on the accelerator


--
þT

L'autisme c'est moi

"Space folds, and folded space bends, and bent folded space contracts and
expands unevenly in every way unconcievable except to someone who does not
believe in the laws of mathematics"


"Richard" <[email protected]> wrote in message
news:[email protected]...
> The idle speed on my Discovery is very eratic, almost feels like it going
to
> stall sometimes. I have taken out the idle stepper motor and cleaned it
but
> its still the same.
> I did read somewhere that if I disconnect the plug with the engine at idle
> the speed should increase to approx 2000rpm. Can anyone confirm if this is
> correct? How can I test it? If I need a new one, how much is it likely to
> be?
> When switched to lpg its lovely and smooth.
> Thanks
> Richard
>
>

"Larry" <[email protected]> wrote in message
news:[email protected]...
> You think you have problems, the idle speed for me depends upon my ability
> to keep my heel on the brake and my toe on the accelerator
>
>
> --
> þT
>
> L'autisme c'est moi
>
> "Space folds, and folded space bends, and bent folded space contracts and
> expands unevenly in every way unconcievable except to someone who does not
> believe in the laws of mathematics"

Aah, that'll be the laws of Bistromathics, then? All to dow ith waiters,
their movements and scribblings, apparently. (Ask Slartibartfast if you're
unsure!)
Badger.

On or around Thu, 26 Jan 2006 21:20:08 GMT, "Richard" <[email protected]>
enlightened us thusly:

>The idle speed on my Discovery is very eratic, almost feels like it going to
>stall sometimes. I have taken out the idle stepper motor and cleaned it but
>its still the same.

which model engine/vehicle?

--
Austin Shackles. www.ddol-las.net my opinions are just that
"The breezy call of incense-breathing Morn, The swallow twittering
from the strawbuilt shed, The cock's shrill clarion, or the echoing
horn, No more shall rouse them from their lowly bed."
Thomas Gray, Elegy Written in a Country Churchyard.

"Badger" <[email protected]> wrote in message
news:[email protected]...
>
> "Larry" <[email protected]> wrote in message
> news:[email protected]...
> > You think you have problems, the idle speed for me depends upon my
ability
> > to keep my heel on the brake and my toe on the accelerator
> >
> >
> > --
> > þT
> >
> > L'autisme c'est moi
> >
> > "Space folds, and folded space bends, and bent folded space contracts
and
> > expands unevenly in every way unconcievable except to someone who does
not
> > believe in the laws of mathematics"
>
> Aah, that'll be the laws of Bistromathics, then? All to dow ith waiters,
> their movements and scribblings, apparently. (Ask Slartibartfast if you're
> unsure!)
> Badger.
>
>
"In Relativity, Matter tells Space how to curve, and Space tells Matter how
to move. The Heart of Gold told space to get knotted, and parked itself
neatly within the inner steel perimeter of the Argabuthon Chamber of Law."
-Douglas Adams, from Life, The Universe, and Everything

oops, should have said....its a 1995 Discovery 3.9.

Richard


"Austin Shackles" <[email protected]> wrote in message
news:[email protected]...
> On or around Thu, 26 Jan 2006 21:20:08 GMT, "Richard"
> <[email protected]>
> enlightened us thusly:
>
>>The idle speed on my Discovery is very eratic, almost feels like it going
>>to
>>stall sometimes. I have taken out the idle stepper motor and cleaned it
>>but
>>its still the same.
>
> which model engine/vehicle?
>
> --
> Austin Shackles. www.ddol-las.net my opinions are just that
> "The breezy call of incense-breathing Morn, The swallow twittering
> from the strawbuilt shed, The cock's shrill clarion, or the echoing
> horn, No more shall rouse them from their lowly bed."
> Thomas Gray, Elegy Written in a Country Churchyard.

<John Abbatt> wrote in message
news:[email protected]...
> On Thu, 26 Jan 2006 21:20:08 GMT, "Richard" <[email protected]>
> wrote:
>
> >The idle speed on my Discovery is very eratic, almost feels like it going
to
> >stall sometimes. I have taken out the idle stepper motor and cleaned it
but
> >its still the same.

I have a similar problem on my M reg 3.9
It does vary, some days runs perfectly, some days stalls at every junction,
some days the rpm at idle will go to zero then shoot up then idle ok for a
couple of seconds then zero etc.

On a typical day it will start up ok and run ok and idle ok until I have
driven about a mile and half (just warmed up). When I stop the engine will
die. Switching off the ignition and restarting solves the problem and it
will be ok for the rest of the day (on a good day). I was wondering if
maybe that was resetting something in the electronics to a default
condition.

I have never cleaned the plenum chamber / idle bleed ports and will try
following that advice, is it just a case of unbolting it and lifting it off?
Am I likely to bugg** any thing up? or need a new gasket or anything before
fiddling.

Would paying a dealer to run test book or whatever the expression is be a
good idea and what is a typical price for them to do that?

Many thanks for all the advice.

Les