[urq] warm up issues

[urq]

... from what I read of your note I'd be more suspicious of the lack of
buzzing on the OXS Freq Valve.  Have you checked the duty cycle?  If duty
cycle reads correctly when the OXS Freq Valve is not buzzing then it would
be the valve itself.  What you describe is similar to what my car was doing
before the engine swap, so my first guess would be a similar "warm up" issue
in the MAC-02.  You can always activate the WOT switch when idling to see if
that doesn't make your OXS Freq Valve buzz as a quick check.  

If you suspect the WUR you'll need a fuel pressure gauge with cut off switch
per the Audi troubleshooting procedure.  It will be a simple matter to
verify that the pressure is correct for the temperature by reading from the
chart.  The WUR also has a heater, perhaps that is non-functional ... that
way the control pressure would remain low until the engine block warmed up.

Steve B
San José, CA (USA)

-----Original Message-----

   
   When I first start the car in the morning, it fires right up and stettles
into a good fast idle, around 1100 or so. No FV buzz. When it starts going
open loop, it runs rough, will almost die, and I notice the vacuum reading
is low, around 8-9 inches. Still no FV buzz. 
   
    After awhile, like maybe 15-20 minutes, the FV will start to buzz
intermittantly, and the vacuum will slowly rise to around 15 inches. After
this, the FV and duty cycle are fine, and the idle is around 900 rpm. 
   
    I'm going to check fuel pressure while all this is happeneing tomorrow.
Last I checked (about 2 weeks ago) all was fine.
   
    Also, if I'm driving the car while the vacuum reading is low, I will
feel it trying to smooth out and then suddenly I 'll feel a push in my lower
back, telling me the system is now operating properly.
   
   Symptoms of a bad WUR?
   
  thanks!
   
  Gary