Mixture setting

Jesse+ Clendenning AWDAudi at excite.com
Mon Apr 30 07:01:49 EDT 2001

I have finally recieved my new fuel distributor and injectors. Low and
behold... the beast has never run better, even before I adjusted the idle
and mixture. I'd like to thank everyone for their posts and continued effort
in helping me find the reason for my calamity. Thanks again.

>  On Thu, 19 Apr 2001 00:24:27 -0700, one at humanspeakers.com wrote:
>  >  
>  >  
>  >  Jesse+ Clendenning wrote:
>  >  > 
>  >  > Thanks for the suggestion Huw. It is relatively new. I did measure
>  >  > adjust the mixture to ~0.5 volts according to O2. It idles decent
>  there.
>  >  > What I thought of today was measuring the voltage at different RPM
as I
>  had
>  >  > with the duty cycle to see if it responds accordingly. 
>  >  
>  >  the OXS voltage, like the duty cycle, should vary *continuously* whiel
>  >  the engine is running and warm.  if not, chances are either the OXS is
>  >  bad or the ECU is not controlling the system properly.
>  >  
>  >  > If it doesn't then I
>  >  > need a replacement for the O2 sensor. If the results match... then I
>  need to
>  >  > look at maybe the Fuel Distributor or the Warm up Regulator because
>  fuel
>  >  > pressure would not be stable? As you can tell that is a little of a
>  question
>  >  > mark.
>  >  
>  >  if the car is not going into "closed loop" then several things could
>  >  at fault - temp sender, so the ecu always thinks the engine is cold,
>  >  not responding to exhaust content, wiring problems (missing fuse, bad
>  >  ground at intake manifold, etc.)... and probably a few other things I
>  >  can't remember right now!
>  >  
>  >  hope this helps a little, anyway.
>  >  
>  >  -- 
>  >  Huw Powell
>  >  
>  Thanks buddy. I have specked out each of my temp sensors, warming my
>  up, as it cools taking resistance readings. Flawless (Should be, they're
>  month old). Measured air temp sensor resistance also. The main 4 teminal
>  temp sensor is new also. New throttle switch. When I redid the head I
>  replaced most sensors. O2 sensor among them. I always use quality parts
>  german. My new fuel pressure gauge helped me track this down. I know the
>  Fuel Distributor *never* fails and is usually misdiagnosed. This is why
>  diagnosis took me so long. I went through every system at least 5 times
>  be certain. At times completely disassembling the system to be sure
>  everything is fastened correctly and tests could be followed out to the
>  letter. I went through all connections at the MAC11, Good. I've only
>  CIS Audi's and VW's and truely understand the system. I can tell you are
>  extremely knowledgeable about these automobiles. I'm sure I don't have
>  experience, (never done an engine swap... 2.1 to 2.3, etc.) but I am
>  there and learning everyday. Thank you for your continued interest in
>  thread. On Friday or Monday I will receive my new Fuel Distributor and
>  injectors (I wanted them anyway... why not now?). I will tell you of my
>  adventures then. 
>  Sorry for the long post. I find the list to be unmeasurably valuable. At
>  times it is my greatest reference for repair (the truth is there if you
>  for it).
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