[Diy_efi]
ralph granchelli
rgranchelli at yahoo.com
Thu Feb 17 02:12:42 GMT 2005
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I have a problem with my Commander 950 TBI system that I need assistance with
I have a 700 CFM Holley Commander 950 TBI narrowband system installed on a Ford 351 Cleveland. I use a Crane Hi-6 CDI with a Crane street strip distributor. I do not have real time spark control on this set up but the Crane street strip distributor has programmable advance curves.
I use the tach out line from the Hi-6 to trigger the Holley ECU and to run a MSD tach adaptor to drive the tach
I run speed density. I have set up the fuel map under varied driving conditions such that I always run around 12:5 to 13 to 1. Coolant modifiers, afterstart and cranking PW are all adjusted so that it starts well under most conditions.
In one of my headers I have installed a bung for my wideband sensor for my gas analyzer that I use for tuning.
The problem I am having is as follows. Sometimes when I start the engine either hot or cold it will go into a real lean state, around 22:1.It will stay this way until I restart. Sometimes it will recover on its own after about 20 seconds or so. I have it set so on hot restart it takes 30 seconds before it goes closed loop on idle. Shutting the engine off and restarting one or two times always cures it. I can be driving for an hour and do a restart and it will do the lean thing. Sometimes when I start cold it will do it. It appears to be a random occurrence but always on startup.
I have used this system in other applications before and never had a problem like this
You can see a description of the install here: http://www.panteraplace.com/page176.htm
When it does it, it will be reading from the same block on the fuel map where it was just running at 12.5:1 seconds ago and now upon restart it is running 22:1. I have checked every sensor, connections, fuel pressures, grounds, swapped ECU’s etc.
If you guys have any suggestions on how to track this down I would appreciate your inputs. It is driving me crazy and I need inputs from you experts!
TNX & Rgds,
RG
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<DIV>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>I have a problem with my Commander 950 TBI system that I need assistance with</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>I have a 700 CFM Holley Commander 950 TBI narrowband system installed on a Ford 351 Cleveland. I use a Crane Hi-6 CDI with a <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:Street w:st="on"><st1:address w:st="on">Crane street</st1:address></st1:Street> strip distributor. I do not have real time spark control on this set up but the <st1:Street w:st="on"><st1:address w:st="on">Crane street</st1:address></st1:Street> strip distributor has programmable advance curves.</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>I use the tach out line from the Hi-6 to trigger the Holley ECU and to run a MSD tach adaptor to drive the tach</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>I run speed density. I have set up the fuel map under varied driving conditions such that I always run around 12:5 to 13 to 1. Coolant modifiers, afterstart and cranking PW are all adjusted so that it starts well under most conditions.</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>In one of my headers I have installed a bung for my wideband sensor for my gas analyzer that I use for tuning. </FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>The problem I am having is as follows. Sometimes when I start the engine either hot or cold it will go into a real lean state, around 22:1.It will stay this way until I restart. Sometimes it will recover on its own after about 20 seconds or so. I have it set so on hot restart it takes 30 seconds before it goes closed loop on idle. Shutting the engine off and restarting one or two times always cures it. I can be driving for an hour and do a restart and it will do the lean thing. Sometimes when I start cold it will do it. It appears to be a random occurrence but always on startup.</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>I have used this system in other applications before and never had a problem like this</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>You can see a description of the install here:<SPAN style="mso-spacerun: yes"> </SPAN>http://www.panteraplace.com/page176.htm</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>When it does it, it will be reading from the same block on the fuel map where it was just running at 12.5:1 seconds ago and now upon restart it is running 22:1. I have checked every sensor, connections, fuel pressures, grounds, swapped ECU’s etc. </FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>If you guys have any suggestions on how to track this down I would appreciate your inputs. It is driving me crazy and I need inputs from you experts!</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>TNX & Rgds,</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>RG</FONT></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p><FONT face="Times New Roman" size=3> </FONT></o:p></P></DIV><p>
<hr size=1>Do you Yahoo!?<br>
Yahoo! Search presents - <a href="http://us.rd.yahoo.com/evt=30648/*http://movies.yahoo.com/movies/feature/jibjabinaugural.html">Jib Jab's 'Second Term'</a>
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