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FI problems

>1) Is there anyway for me to check that a particular sensor is actually the 
correct part number for my model/year car other than 
>the partsman say so?

There were two sensors, but they are electrically identical, just the wire 
length changed.  The microfilm mentions a third one and refers to some parts 
service bulletin which I have no knowledge of.  I've never seen one.

>2) Does any one have an idea what the most likely compontent of the system 
is causing my high smog output? The car pass 
>fine 2 years ago, has a fairly new engine and is tuned up.

Check the electrical system voltage.  If the regulating voltage is a bit low 
the computer will run the system a bit rich.  I know, totally unexpected and 
nonsensical, but it's true.  There's usually no effect down to 13.5 V, but 
below that things start to get worse and by 12.5 V they are VERY annoying to 
drive.  If you have this problem the solution is to replace the voltage 
regulator with a genuine Bosch (until I get mine in production.)

>3) Is there an explanation for the head temperature appearing to be fine 
with a ohmmeter but a new one causing a different 
>problem in the car? 

Anything's possible, but I suspect you have some other problem and the 
normal variation in sensors has put you off into another area of parameter 

>4) What would cause the idle to change so drastically with engine temperature?

I don't know.  The aux air regulator's job is to hold the idle speed 
approximately constant as thecar warms up.  They always overcompensate a bit 
and run a bit faster when cold, but it's usually not that noticable.  At 
this speed I would think your throttle position switch should shut down the 
engine and you should get that good old loping idle.  I would also check the 
adjustment of that
switch, too.

       Melissa Kepner                                    Jim Adney
       jadney@vwtype3.org              jadney@vwtype3.org
                             Laura Kepner-Adney
                             Madison, Wisconsin

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