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

Sat Feb 19 20:04:01 GMT 2005

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A good method of diagnosing troublesome injectors is to supply the
injector coil from a lab power supply via an accurate ammeter. Increase
the current slowly until the injector opens and record the opening
current, then decrease the current and note the closing current. Repeat
the test several times to get reliable results, and then do it on all
injectors of the engine. In case of mechanical problems with an
injector, the ratio between opening and closing currents will be
different from the other ones.<br>
<br>
Best regards<br>
<br>
Torbj&ouml;rn Forsman<br>
<br>
<br>
ralph granchelli wrote:
<blockquote cite="mid20050219144721.86346.qmail at web41310.mail.yahoo.com"
 type="cite">
  <div>Thanks Will,</div>
  <div>&nbsp;</div>
  <div>Makes sense! I have been looking at waveforms @ <a
 href="http://www.picotech.com">www.picotech.com</a></div>
  <div>&nbsp;</div>
  <div>So just look at the voltage pattern ?</div>
  <div>&nbsp;</div>
  <div>And the spray pattern when running normal and when in the lean
mode ?</div>
  <div>&nbsp;</div>
  <div>TNX &amp; RGds,</div>
  <div>&nbsp;</div>
  <div>RG</div>
  <div>AZ<br>
  <br>
  <b><i><a class="moz-txt-link-abbreviated" href="mailto:WSCowell at aol.com">WSCowell at aol.com</a></i></b> wrote:</div>
  <blockquote class="replbq"
 style="border-left: 2px solid rgb(16, 16, 255); padding-left: 5px; margin-left: 5px;">
    <meta content="MSHTML 6.00.2900.2523" name="GENERATOR">
    <font id="role_document" color="#000000" face="Arial" size="2">
    <div>Hi RG,</div>
    <div>&nbsp;</div>
    <div>Just a thought, the waveforms you will see with a current
probe will be related to the current through the inductive windings of
the injectors, right?&nbsp; So unless there is actually something
electrically wrong with an injector, surely you will get the same
waveform whether the pintle lifts cleanly off the seat or not?&nbsp; I'm not
convinced you would see any sufficiently identifiable effect of a
sticky or part-blocked injector.&nbsp; No harm in checking of course, I'm
just not sure it would be a good idea to rely upon what you see.</div>
    <div>&nbsp;</div>
    <div>Regards</div>
    <div>&nbsp;</div>
    <div>Will Cowell</div>
    <div>G0OPL</div>
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