Ferrari Mailing List: Re: K-jetronic FI on QV cars

[E M (pokiebaron]

I think most AAV have an electrical element to help heat the bimetal strip.
If the electrical portion goes, the AAV still opens and closes (unless
gummed up) just by way of heat sinking, it just works off the bimetal strip
movement, so it becomes mechanical.  They are often mounted on the engine
for that reason.  If you have one that's taking a long time to warm up to
lower the idle, maybe check the electrical connection, and make sure that
part is working.

That's kinda my understand of it anyway.

I've found, one of the benefits of tinkering at home; you often buy parts
you don't need from misdiagnosing things.  Geez, after seeing the price of
some of these parts now, am I ever glad I messed up a bit before and now
have a few extra parts sitting on the shelf. lol.  If you guys think it
hurts to break a fog light on your 328, don't muck up the fuel dis on your K
jetronic car, or mess up that WUR! lol.

Ed
911SC

2008/12/11 <rolindsay [at] yahoo.com>

> The story I'm told is that the US spec cars have a higher initial idle to
> heat the cat (for emissions control). Since the Euro cars of the same
> vintage don't have cats they need only idle a little faster to aid warmup
> and to idle stable when cold.
>
> Cold start enrichment is handled by the cold start injector. Warm-up idle
> speed is controlled by the Aux Air Valve. Yea, it works like a vacuum leak.
> ;-P
>
>
>
> Rick
> Sent via BlackBerry by AT&T
>
> -----Original Message-----
> From: JAshburne [at] aol.com
>
> Date: Thu, 11 Dec 2008 18:10:56
> To: rolindsay<rolindsay [at] yahoo.com>
> Cc: <ferrari [at] ferrarilist.com>
> Subject: Re: [Ferrari] K-jetronic FI on QV cars
>
>
>
> Rick
>
> FWIW, my 400i has two of the K-Jetronic FI systems and it typically idles
> around 1,300-1,400 after startup but fairly quickly (< 5 minutes) settles
>  down
> to 1,000 rpm idle.  2,000 rpm sounds a bit high for an idle speed even  if
> right from a cold start.
>
> John
>
>
> In a message dated 12/11/2008 6:02:02 P.M. Eastern Standard Time,
> coyote [at] acme-ltd.com writes:
>
> Rick  -
>
> Yes and no.
>
> The US cars are more complex than those sold in  the rest of the world,
> and they have more stuff that affects this. I  also believe (but could
> be wrong) that the euro cars don't idle as  high on a cold start.
>
> It also depends a lot on ambient temperature. If  the car has been left
> out overnight in 20 degree weather, the idle  won't be as high since
> the transmission oil and other fluids being  thicker will cause
> significant drop.
>
> When it is about  50 - 60 degrees, yes the idle will be somehere around
> 1500 - 2000  for a few minutes.
>
> But, if the car starts ok when cold, and drives ok  immediatley on a
> cold start, then everything is alright.
>
> If  there were a problem with the AAV, it most likely would not idle
> well when cold. You could try cleaning the AAV, sometimes they get
> gummed up.
>
> A problem with the cold start injector, or TTS would  cause an extended
> crank when cold, but once started should not have  any effect.
>
> A problem with WUR, would cause a bunch of varying idle  and
> driveability problems.
>
> I had a 3.2 Mondial in the shop  this past summer that had come to MA
> from AZ. The AAV had been  disconnected. The car wouldn't idle
> initially on a cold start. We're  talking ambient temps of 60ish
> degrees in this  case.
>
> Reconnected it and all was  well.
>
> YMMV,
>
> Jeff
>
> Sent from my iPhone
>
> On Dec 11,  2008, at 4:21 PM, Rick Lindsay <rolindsay [at] yahoo.com> wrote:
>
> >  Hey Gang,
> >
> > On your QV 3x8s and Mondials, does the idle speed  run high at start-
> > up?  I have heard stories of the US cars  idling really high
> > (>2000rpm) when first started cold.   Every book I have read on K-
> > Jetronic discussed the cold start  injector and the additional air
> > valve to raise cold idle  speed.  My Euro. QV has none of that
> > behavior.  First  start-up or after a long run, engine cold, hot or
> > in between,  it idles at 1000rpm.  Should it have a higher idle speed
> >  when cold?
> >
> > What I'm asking is whether the cold start circuit  in my car is
> > working properly.  It starts flawlessly but  has no increase in idle
> > speed at all.
> >
> >  Thoughts?
> >
> > rick
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