[Diy_efi] Need help from the experts diagnosing lean state upon

[Bret Levandowski]

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If the injector is sticking when opening, you will see a spike in the current at that point. It's subtle, but it's there. The magnetic field will find it hard to overcome the 'stick' and it will cause a momentary (very) jump in the draw on the windings. We spent some time screwing around with 'dead' injectors with known problems to see if we could see anything on the scope. 

WSCowell at aol.com wrote:Well, if I'm right, it won't make a difference whether you look at voltage or current waveform, because they simply tell you about the electrical performance of the winding in the injector.  What you really want to know is a purely mechanical thing, i.e. "Is the injector lifting off its seat cleanly when pulsed?  What is its spray pattern like?  Does it deliver fuel at the correct rate?"   That sort of stuff.
 
What I'm leading up to is that I don't think electrical measurements will tell you anything about the important bit inside the injector, the valve itself, that lets the fuel through when opened by current flowing through the winding.
 
Regards
 
Will
 
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<DIV>If the injector is sticking when opening, you will see a spike in the current at that point. It's subtle, but it's there. The magnetic field will find it hard to overcome the 'stick' and it will cause a momentary (very) jump in the draw on the windings. We spent some time screwing around with 'dead' injectors with known problems to see if we could see anything on the scope. <BR><BR><B><I>WSCowell at aol.com</I></B> wrote:
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<DIV>Well, if I'm right, it won't make a difference whether you look at voltage or current waveform, because they simply tell you about the electrical performance of the winding in the injector.&nbsp; What you really want to know is a purely mechanical thing, i.e. "Is the injector lifting off its seat cleanly when pulsed?&nbsp; What is its spray pattern like?&nbsp; Does it deliver fuel at the correct rate?"&nbsp;&nbsp; That sort of stuff.</DIV>
<DIV>&nbsp;</DIV>
<DIV>What I'm leading up to is that I don't think electrical measurements will tell you anything about the important bit inside the injector, the valve itself, that lets the fuel through when opened by current flowing through the winding.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Regards</DIV>
<DIV>&nbsp;</DIV>
<DIV>Will</DIV>
<DIV>&nbsp;</DIV></FONT>_______________________________________________<BR>diy_efi mailing list<BR>diy_efi at diy-efi.org<BR>http://lists.diy-efi.org/mailman/listinfo/diy_efi<BR></BLOCKQUOTE></DIV><p>__________________________________________________<br>Do You Yahoo!?<br>Tired of spam?  Yahoo! Mail has the best spam protection around <br>http://mail.yahoo.com 
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