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

[rolindsay (rolindsay]

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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