RE: [DMCForum] Dead freq valve update
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RE: [DMCForum] Dead freq valve update



Rich,

Bear in mind that the frequency valve may stop buzzing if it's actually
functioning correctly, too.  Since the cleaning, your overall mixture may
have changed as things clean out.  Have you adjusted the CO mixture screw
again to check?

Remember, the best way to find out what is wrong with the car is to ask
it,
and listen to its answer.  It sounds wacky, but it's the truth.  Ask the
right questions and your car WILL tall you what's wrong.

Also, remember the principle of Occam's DeLorean:  All other things being
equal, the simplest solution is usually the correct one.  It's natural for
us to blame problems on components we don't understand -- everyone does
it.
You just have to break down the situation into the right parts.

First off, you have to correctly define the question.  The problem is not
"what is the problem with the lambda system" -- it's "why is the frequency
valve not buzzing when it should be buzzing".  The main two hypotheses
that
can be formed from that question are:

- The system IS functioning as designed (yes, that is a possibility, and
remembering the principle of Occam's DeLorean, is actually the
probability)
- The second is that it is NOT functioning as designed.

Then you need to come up with tests to try out each hypothesis.  Here's a
couple of things to try to test the first scenario: 

- Change the CO mixture and note the results.
- Try checking the function of the O2 sensor per the manual... open the
circuit, and do the test with the AA battery
- Reread the section of the tech manual and come up with your own
questions.

For the second scenario, I'd try:

- Check all of the electrical connections and grounds.
- Run the tests per the manual on the frequency valve.

As you see the results of each test, more tests may come to mind.  Try
them
out, and see what you discover.

That's the scientific method of DeLorean maintenance we talked about when
you were working on the heads.  You have become the DeLorean scientist
already -- you just need to get back to it.

The secret to Zen Maintenance is not a "knack" or a "gift"; it's simply
putting enough pieces together to see the big picture.  There is a perfect
DeLorean engine that you are coming to understand.  Yours, at present,
does
not match that mental picture, right?  So start to look at it from all the
different angles, and see how yours differs from the perfect one.  Study
the
differences, and you will find an answer to your question.

Okay, that's enough of the Zen ramble for today.  =)

-Dave


[Non-text portions of this message have been removed]



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