"chibitul" <chibitul@sbcglobal.net> wrote in
news:1125865969.551644.22620@f14g2000cwb.googlegro ups.com:

> I followed the instructions step-by-step to check the ignition timing
> in my 1997 Civic LX. It was maybe 1/2 degree out of spec, I set it
> where it should be.
>
> Now, I want to know why you should jumper that service check connector
> when you do this? what happens if you don't jumper this connector?


When you set the distributor, you are setting the "base" timing, which is
the datum from which all other adjustments are made. This floor must be
correctly set, otherwise everything else may be off.

Jumping that connector prevents the ECM from being able to adjust the
timing while you're setting it, so you are for sure setting the "base"
timing without interference from the computer.

It is not a given that the ECM will adjust the timing, but if it does, your
base setting will be messed up.



>
> BTW: I could not locate the other connector (the 3-pin connector for
> data). I found where it should go in that rubber thing, but I cannot
> find the connector and the wires. Maybe 97 doesn't have one?



You mean the OBD connector?
http://www.tegger.com/hondafaq/faq.html#retrieve


>
> next thing I want to check is the PCV, but I cannot identify the valve,
> even though I have some "diagrams" I am probably looking at it, but I
> cannot "see" it
>


http://www.tegger.com/hondafaq/pcv-replace/index.html

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TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/