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

[Jeff Greenfield (coyote]

   Yes, I know 2000 rpm for a cold start idle seems high, but that's the
   way the injected 308's and Mondials were set up. Some people have
   disabled the systems to prevent the excessively high fast idle.



   Jeff



   -------- Original Message --------
   Subject: Re: [Ferrari] K-jetronic FI on QV cars
   From: JAshburne [at] aol.com
   Date: Thu, December 11, 2008 6:10 pm
   To: Jeff Greenfield <COYOTE [at] acme-ltd.com>
   Cc: ferrari [at] ferrarilist.com
   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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