RE: [DML] Re: Still running 2700 ohms...
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RE: [DML] Re: Still running 2700 ohms...



Actually, it seemed that the problem was that the distributor was generating 
"extra" pulses. Dave T. is right; it puts out a sort of sine wave, except 
that, because it is an odd-fire engine it puts out 2 waves fairly close, 
then a larger gap, then two again, etc. The problem we were seeing were 
random, spurious, very narrow "spikes" within the large gap where there 
sould be no pulses. These were picked up by the ECU and translated to the 
ouptut (as confirmed by comparing channel 1, input to channel 2 outputon the 
'scope). This also explains the "twitching tach".  We suspect the resistor 
attenuated the amplitude of these narrow pulses enough so they they fell 
below the threshold of the ECU. Dave D. confirmed that he initially solved 
the problem by increasing the resistance until the problem went away (hence 
the 2700 ohms). I still don't understand the reason for these random spikes, 
but it might have to do with charge building up and not being discharged 
completley where it should.

Tom N



>From: "David Teitelbaum" <jtrealty@xxxxxxxxxxxxx>
>Subject: [DML] Re: Still running 2700 ohms...
>
>If you want to get technical about it the resistor is moving the
>baseline of the sine wave.


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