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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2157777@logan.com>
Subject: Re: [FlyRotary] Suddenly Sparkless.
Date: Wed, 4 Jul 2007 10:13:33 -0400
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Hi Chris,

Teething problems can be frustrating for sure, especially when you appear to 
lose ground.

I don't have a crystal ball, but here is my first thought when something was 
working and I did something and it no longer works - I may have done 
something (unknowingly of course) that caused it to stop working.

You mentioned that you pulled all C/B before replacing the alternator. Is it 
possible that by doing so you may have 1). Found a faulty CB  2). Found a 
disconnected terminal to a CB.  I know you checked voltages but just a 
thought.  I would physically check (visually at least, tug gentle on wires 
going to/from CBs) all CB.

Also, one thing that can cause the EC2 to act "funny" is if the battery 
voltage goes too low.  I presume you checked the voltage to the EC2. 
Battery didn't get run down using a bad alternator did it?

Its disturbing to hear about the mode 0/ mode 1 conflict.   I know at one 
time, Tracy talked about changing the injector test mode from mode 1  to a 
different little used mode (such as mod 3) because some folks fly with mode 
1 selected (inorder to play with the fuel map) and upon landing forget to 
reset it to mode 0.  Next time they hop in the airplane (forgetting it is in 
mode 1) turned on the pumps and push the store button to get a prime shot 
and instead end up flooding the engine because they get injector test mode 
instead.  Don't ask me how I know this {:>).  But, to the best of my 
knowledge, he had not made any such changes.

If the EC2/PM is indeed malfunctioning with mode confusion then its really 
hard to say what the problem might be.  However, here is the only thing I 
can think of.  Assuming the EC2 and PM are functional electrically - then 
there is the possibility (however remote) that the mode switch has jumped a 
cog.  In  other words, mode 0 is not mode 0 but actually Mode 1, Mode 1 
setting is actually mode2, etc.  So if that did happen then setting the EC2 
to mode 7 vice Mode 8 should get the coils to fire.  But, even if the mode 
selector switch had jumped a cog but the EC2 was working correctly, then you 
would think you would get it to run or at least generate a spark.

So check battery voltage to EC2, check CB wiring physically, beat your head 
against wall - Oops you're already doing that {:>)

Good luck, Chris.  If I can think of anything else you might check I'll let 
you know.

Ed


----- Original Message ----- 
From: "Christopher Barber" <CBarber@TexasAttorney.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, July 04, 2007 9:39 AM
Subject: [FlyRotary] Suddenly Sparkless.


> 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
>
>
> --
> Homepage:  http://www.flyrotary.com/
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