[Gmecm] Idle problem

Programmer lwester at lincsat.com
Mon Aug 22 16:13:56 UTC 2005


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Those IAC numbers are not indicating a vacuum leak.
Check the "P/N" signal to the computer. If it's getting an 'ingear' =
signal when you're actually in park, you'll have a high idle. Another =
problem is a false VSS signal (from RFI or EMI) down the signal line to =
the computer (if it thinks you're on the move, the IAC counts will =
rise). Drop your commanded RPM values...750 doesn't really equal 750...

Lyndon.

  ----- Original Message -----=20
  From: matthew10_5 at netzero.net=20
  To: gmecm at diy-efi.org=20
  Sent: Sunday, August 21, 2005 2:56 PM
  Subject: [Gmecm] Idle problem






  I have discovered that when the "CEL" flashes rapidly it means that =
the Eprom has a problem. It could be a bad connection or even a bad =
burn. Also an incorrect checksum does this. Okay back to the subjest.

  My question is two fold. One, ( Using the 7747-mine.ecu to edit my =
bin) I have been unable to bring my idle RPM down to 750. Every =
attribute that deals with engine RPM on this TBI 305 has been set to =
around 750 RPM. When the ECU enters the close loop mode the idle stays =
at 1000 RPM no matter what is done. The butterfly are set correctly and =
the IAC sets itself to around 30 to acheive 1000 RPM. Is there some =
other reason I cannot control the Idle where I want it?=20

  Question Two:  What is the  Differance between " VE as % {FL1} " and " =
VE as% {FL2} "?

  Thanks..Fred



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<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
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<STYLE></STYLE>
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Those IAC numbers are not indicating a =
vacuum=20
leak.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Check the "P/N" signal to the computer. =
If it's=20
getting an 'ingear' signal when you're actually in park, you'll have a =
high=20
idle. Another problem is a false VSS signal (from RFI or EMI) down the =
signal=20
line to the computer (if it thinks you're on the move, the IAC counts =
will=20
rise). Drop your commanded RPM values...750 doesn't really equal=20
750...</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Lyndon.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Dmatthew10_5 at netzero.net=20
  href=3D"mailto:matthew10_5 at netzero.net">matthew10_5 at netzero.net</A> =
</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dgmecm at diy-efi.org=20
  href=3D"mailto:gmecm at diy-efi.org">gmecm at diy-efi.org</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, August 21, 2005 =
2:56=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [Gmecm] Idle =
problem</DIV>
  <DIV><BR></DIV><BR><BR><BR>
  <P>I have discovered that when the "CEL" flashes rapidly it means that =
the=20
  Eprom has a problem. It could be a bad connection or even a bad burn. =
Also an=20
  incorrect checksum does this. Okay back to the subjest.</P>
  <P>My question is two fold. One, ( Using the 7747-mine.ecu to edit my =
bin) I=20
  have been unable to bring my idle RPM down to 750. Every attribute =
that deals=20
  with engine RPM on this TBI 305 has been set to around 750 RPM. When =
the ECU=20
  enters the close loop mode the idle stays at 1000 RPM no matter what =
is done.=20
  The butterfly are set correctly and the IAC sets itself to around 30 =
to=20
  acheive 1000 RPM. Is there some other reason I cannot control the Idle =
where I=20
  want it? </P>
  <P>Question Two:&nbsp; What is the&nbsp; Differance between " VE as % =
{FL1} "=20
  and " VE as% {FL2} "?</P>
  <P>Thanks..Fred</P>
  <P>
  <HR>

  <P></P>_______________________________________________<BR>Gmecm =
mailing=20
  =
list<BR>Gmecm at diy-efi.org<BR>http://lists.diy-efi.org/mailman/listinfo/gm=
ecm<BR></BLOCKQUOTE></BODY></HTML>

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