Dear Friends......and the rest of y'all <g>

I am about to drag myself though old post to help diagnose the latest
"issue" (starting with the post to help Buly).  But, should any of you kind
gentlepersons have instant insight, or better yet, a crystal ball with a
solution, feel free to chime in.

First, I seem to be having a problem with the ECU's PCM.  When I press the
store button in mode 0, it will fire the injectors as if they are in mode
1's test mode instead of just prime.  I can get 'em to quite by changing the
mode select, but it is troublesome.

SECOND, and my current focus, is I have lost spark.  I get no spark when
cranking or placing the ECU in mode 8 and test firing the plugs.  This is
the same with both computer A and B.

We have tested the power in GM harness lead H and we have power.  We also
have solid grounds on lead E & A.  Also the grounds to the ECU are good as
are the continuity checks of the wire/connections from the ECU to the coils.

What else to do?  I don't know how to check the coils themselves or if the
ECU is actually talking to the coils (it is talking to the injectors.

The engine was running about four days ago.  I modified some cooling
plumbing and changed an alternator in the last four days afar pulling all of
the C/B's.  Nothing else changed.  I am again frustrated but should plow
though.  Thoughts?

Thanks.

All the best,

Chris

Christopher Barber
Attorney and Counselor at Law
5110 Bissonnet, No 418
Bellaire, Texas 77401

Serving the Needs of Senior Texans

281-464-LAWS (5297)
281-754-4168 Fax
www.TexasAttorney.net