Re: [DML] idle revisited

["Adam 16683" <acprice1@xxxx>]

Hey Jerry, isnt there another vacuum line that goes to the forward 
section of the car for the brakes servo? 
Also if the car is automatic there should be a vacuum hose for the 
transmission as well? 

adam

--- In dmcnews@xxxxxxxxxxxxxxx, "Jerry Harry" <jlharry@xxxx> wrote:
> Well,
> Im not one of the guru's on this list, however I have spent 
time on
> this idle circuit.
> I think if your idle speed motor is working ( Buzzses with the 
key on,
> engine off ) and your idle tends upward you have a vacuum ( inlet 
air) leak.
> The leak prevents the idle motor from being in total control of the
> available air to the engine at idle.
> Where the air is getting in can sometimes be located with an 
accelerate
> like carburetor cleaner. Just a shot here and there to find the 
spot that
> outside air is getting into the intake manifold. When the 
accelerate gets
> in, the engine RPM will go up for a moment. I would start at the 
back left
> side were the idle control motor hose goes into the intake 
manifold. (
> O'ring missing) Then at all the openning into the intake even the 
ones you
> think are closed.
> The diafram in the ac/heater switch could be open or any one of 
the
> vacumn lines under the dash could be open, broken, etc. So to get 
them all
> out of the question I would remove the large rubber line coming out 
of the
> intake manifold on the rider side and plug the manifold. This way 
you know
> the leak is not forward in the cars compartment.
> I'm surte you have tried most of this but it might help someone.
> Your's in the Hobby
> Jerry Harry
> Vin #4890
> 
> 
> 
> From: "Louie Golden" <louie@xxxx>
> To: <dmcnews@xxxxxxxxxxxxxxx>
> Sent: Wednesday, December 24, 2003 2:06 PM
> Subject: [DML] idle revisited
> 
> 
> > Hey group,
> >
> > I've done some more fiddling around with my car's idle... trying 
to figure
> out what the deal is. Initially I thought the cable was somehow not 
getting
> enough tension to return the throttle arm to the microswitch, but 
it looks
> like that is no longer the issue. The throttle can return the arm 
to close
> the microswitch, but the microswitch doesn't make the car idle down 
every
> time like it should. I've lubricated the ever living mess out of 
every
> visable part of the throttle linkage from front to back on the car 
for
> reference. When the car is cold, it idles perfectly (well, as 
perfectly as a
> PRV CAN idle...), but as the car warms up, something suddenly 
happens and
> the car's idle jumps to 1500 and stays. I've watched it in the 
driveway as
> this happens, so since the throttle arm isn't moving, this tells me 
it's
> something in the automatic idle system. Several months ago I could 
blip the
> throttle, and the car would *sometimes* idle down to where it 
should, but
> this is no longer the c!
> > ase. The idle is getting progressively higher. After being 
driven, it now
> wants to idle at about 2000 rpms.
> >
> > Over the last few days I've played around with some things. First 
I just
> unplugged the idle speed motor to see what happens. The idle will 
drop about
> 200 rpms sometimes, but will jump up other times when I try this, 
but when I
> plug it back in the car idles down to 800 rpms. So for an 
experiment, I
> tried switching out the idle speed motor with one from my old 
DeLorean. This
> changed nothing with the idle situation. So let me see if I 
understand how
> the idle system works- the idle speed motor is electronically 
controlled by
> the idle speed ECU. The idle speed motor controls the throttle 
plates by
> vacuum. For reference, I also put on a new CPR over the weekend, 
and I also
> know the O2 sensor is bad because the car hunts when it is very 
very cold.
> So I've deduced that my idle speed ECU is the problem after all of 
this. Am
> I correct? Is there any further ways to test it? I really don't 
want to
> chunk down that kind of money if I don't have to, but the idle 
situation is
> getting so ann!
> > oying that I don't want to drive it any more. I would be 
grateful for any
> additional viewpoints or suggestions. Thanks!
> >
> > Louie Golden
> > VIN 5252
> > NC plates "88 MPH"
> >
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