lugnut

And you would be one of the qualified techs I mentioned to
the OP a couple of post back. The cost of parts and the
complexity of the systems is such now that much money could
be saved by utilizing those services. Shooting the
messenger is not the way to get the job done and the hassle
factor could be greatly reduced. Lugnut

bob

Not only that but on top of the original problem there is often at least one
other problem created by junk parts or improper installation making
diagnosis even more difficult.
Bob

Hear Hear!!!. Nothing like "experienced parts" when troubleshooting.
replacing parts that cannot be proven defective is a good way to end
up chasing your tail. Even replacing those you CAN prove defective is
sometimes troublesome. I have a 1994 Trans Sport 3.8 which I bought
with a toasted engine 4 years ago. I put a new rebuilt engine in, with
a new Bosch O2 Sensor. On the first long trip (to Florida from
Ontario) the engine misfired occaisionally and eventually turned on
the check engine light and threw a code (can't remember the number)
indicating it was running lean. I figured it was a bad O2 sensor, but
was unable to prove it 100%, so I put in a new one (under warranty).
That summer I attempted to tow my 17 foot trailer, and could not go
30km without having it act up. I checked EVERYTHING - neglecting te
now twice replaced O2 sensor. I finally gave up and sold the trailer
after not using it for 2 summers. Then last winter it started doing
the stutter/cut out thing again - and putting the CEL on while driving
to work. I put the OBD tester on, with it monitoring O2 sensor
voltages and when it started acting up, I found the voltage stuck at
0.44 volts. That is neither rich, nor lean - and the code (when it
finally showed)said engine lean.The sensor was going open circuit, and
we were reading the ECU supplied bias. I put in a new AC Delco O2
sensor and have not had the problem in the last 11 months.
This is not an isolated incident. There are an AWFULL lot of
defective, dead in the box, parts being sold today - and if you
install one while troubleshooting it WILL ruin your day!!!.

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