Mixture setting

[Jesse+ Clendenning]

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 and
>  > 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 the
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 be
>  at fault - temp sender, so the ecu always thinks the engine is cold, OXS
>  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 engine
up, as it cools taking resistance readings. Flawless (Should be, they're a
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 and
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 the
diagnosis took me so long. I went through every system at least 5 times to
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 owned
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 your
experience, (never done an engine swap... 2.1 to 2.3, etc.) but I am getting
there and learning everyday. Thank you for your continued interest in this
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 hunt
for it).





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