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