Missing the Buz -or- My Fuel Distributor is too quite and my car runs like

Ameer Antar antar at attbi.com
Wed Aug 14 13:30:48 EDT 2002

Turbo motors use a frequency valve which buzzes along to regulate the
mixture. It sits sorta near the fuel filter. If the system is in open-loop
mode, it shouldn't buzz. Maybe the system can't get into closed-loop mode.
A bad o2 sensor, or any other sensor might cause this. I'd test the
resistance of the valve itself to make sure there's no short or break in
the windings too. Is the duty cycle showing up on the freq. valve's signal
wires? If the signal is there, the valve might not be responding any more.
Of course, you should check for vac leaks and clean or replace any aging
parts for the entire system. Good luck.


At 12:12 PM 8/14/2002, you wrote:

>Subject: Missing the Buz -or- My Fuel Distributor is too quite and my car
>runs like
>  crap
>To: quattro at audifans.com
>From: robert_a_dupree at bankone.com
>Date: Wed, 14 Aug 2002 10:18:24 -0500
>This I am sure is related the other message dealing with the missing
>Engine-Speed-Sensor code that it being observed but...
>I need someone to refresh my memory on how the duty cycle function works on
>CIS.  Or rather what are the critical inputs to re-enable the duty cycle
>function.  The buzz is gone, and even when using the basic quick check of
>moving the fuel flap up or down (while running) I don't get the buzz.
>As soon as I find the fuel pressure tester I will check control and system,
>but what other sensors, components, or functions are required for fuel duty
>Rob D.
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