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

[E M (pokiebaron]

I might have it all wrong, I always get all confuddled.  I thought the extra
fuel on start up was handled by the cold star injector.  AAV provided the
extra air, but the WUR is what has a line to the plunger in the fuel dis and
effects the idle?  I thought the AAV just provided the addition air for the
increased fuel, but didn't in itself effect idle speed?

Straighten me out guys??  lol

Ed
911SC

2008/12/11 <clyderomero [at] worldnet.att.net>

> You got it right!
> Sent via BlackBerry by AT&T
>
> -----Original Message-----
> From: rolindsay [at] yahoo.com
>
> Date: Thu, 11 Dec 2008 23:49:46
> To: clyde<clyderomero [at] worldnet.att.net>
> Cc: <ferrari [at] ferrarilist.com>
> Subject: Re: [Ferrari] K-jetronic FI on QV cars
>
>
> 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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