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

[Jeff Greenfield (coyote]

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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