[V8] Idle speed too high

[Ed Kellock]

I used 3-in-1 oil to lubricate.  I did not disassemble anything.

Prior to that I used Liquid Wrench to clean the area and work the movement
to free it up real good.  It did not feel stiff or sluggish in any way to
begin with.

Actually, I forgot to put the 3-in-1 oil on the front pivot of the
throttle linkage before reinstalling the throttle body.

The action of the throttle is and was very smooth and I am very sure that
the mechanical action is not the problem.  On general principal, I do
believe there is more I can do to ensure its longevity, etc. but for now,
I really believe there is another issue affecting idle speed.

It may be time to do some parts swapping.  The 1990 V8q came home this
evening with a misfire so it will be staying with me tomorrow while the 93
carries the GF to work.  While I'm at it, I might as well start swapping
parts around between the 90 and 91.

On the 90 V8, I recently replaced spark plugs and distributor caps due to
long cranking times when cold.  I did not have rotors at the time.  I used
Autolite plugs, but I went up one step... I'm not sure if they were
platinum, but I know they weren't the iridium.  I recall some discussion
about Autolites failing, the center electrode physically separating from
the rest, so I will check for that.  I'll start by trying to isolate which
cylinder is not firing and go from there.  This weekend I did a tranny
drain/refill as well as replaced the coolant reservoir.  It ran fine
afterward and again yesterday for a trip to the market.  Seems the misfire
was first present this morning.  Anyway...

Ed

> -----Original Message-----
> From: Ingo Rautenberg [mailto:ingo.rautenberg at gmail.com]
> Sent: Monday, January 19, 2009 8:51 PM
> To: Ed Kellock
> Cc: 'q - V8'
> Subject: Re: [V8] Idle speed too high
>
>
> Hmm.  When you say that you lubricated the throttle rod/pivot
> assembly -- did you do front and back?  By front I mean at the
> bearing you can't see but can feel when you remove the throttle
> body.  This one really tends to dry up and should be lubed at the
> least or (preferably) replaced.
>
> Ingo
>
> On Jan 19, 2009, at 10:29 PM, Ed Kellock wrote:
>
> > Patient is my 91 5spd.  Idle speed is consistently a little too
> > high, like
> > 1100.  Here's what I've done....
> >
> > -removed/cleaned ISV
> > -adjusted TPS
> > -opened up and cleaned throttle butterflies directly -lubricated
> > throttle rod/pivot assembly (it was and is smooth and
> > returns
> > to stop solidly)
> > -went through everything again checking for vacuum leaks
> > -checked cruise control for adjustment etc., no interference
> >
> > Initially I could lower it some by pushing down on the small lever
> > at the
> > front and I found that I had the TPS adjusted so that it was
> > causing the
> > throttle to hang open a bit.  I loosed the TPS, pushed down on the
> > level,
> > backed the TPS off a little tiny bit more and snugged it down.  I
> > confirmed it still returns to closed throttle position (click).
> >
> > The last thing I did was unplug the ISV and start the engine.  The
> > idle
> > seemed right for a moment but then slowly climbed up to 1100.  It
> > seems
> > like it's ECU or something.
> >
> > When I turn the engine off, there's a clack in the passenger side
> > fender
> > well.  I know there's some emmissions shite in there, a reservoir
> > and a
> > valve of some kind, but I don't know what it should/shouldn't do.
> > I am
> > fairly sure I've never heard a clack from that area ever on any of
> > my V8s.
> > Maybe I just never noticed.
> >
> > Thanks,
> > Ed
> >
> >
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