Hunting Idle

Sun Nov 1 19:48:55 GMT 1998

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    Well as far as I know that ecm is for a 512 prom, and the aujp is a =
256
    some time ago tried running a 128K where a 256 was supposed to go, =
and it had about the same problem.  Might try double loading the the=20
    256 on the 512 prom.
    Bruce =20
   =20
    Any help with this would be appreciated...........I am working with =
a mild MPFI 427 big-block project.  The engine and cam are fairly =
conservative,  the induction system is from Accel,  the injectors are 30 =
#/HR SVO saturated units, the computer is a 16197427 with BCC AUJP.   =
Despite much effort, we cannot get a stable warm idle.  The idle speed =
hunts up/down excessively, and the rush of air through the IAC sounds =
like a large household vacuum cleaner.  The IAC is responding to the =
computer.   With a carb,  the engine used to idle nicely at 800 RPM with =
around 16 "Hg.   Learned IAC counts are about 40, and current IAC counts =
swing wildly.  More throttle blade minimum airflow does not seem to help =
much.
    =20
    Thanks.
    =20

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    <DIV><FONT size=3D2></FONT><FONT color=3D#000000 size=3D2>Well as =
far as I know=20
    that ecm is for a 512 prom, and the aujp is a 256</FONT></DIV>
    <DIV><FONT color=3D#000000 size=3D2></FONT><FONT size=3D2>some time =
ago tried=20
    running a 128K where a 256 was supposed to go, and it had about the =
same=20
    problem.&nbsp; Might try double loading the the </FONT></DIV>
    <DIV><FONT size=3D2>256 on the 512 prom.</FONT></DIV>
    <DIV><FONT size=3D2>Bruce&nbsp; </FONT></DIV>
    <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2>Any help with this would be =
appreciated...........I am=20
    working with a mild MPFI 427 big-block project.&nbsp; The engine and =
cam are=20
    fairly conservative,&nbsp; the induction system is from Accel,&nbsp; =
the=20
    injectors are 30 #/HR SVO saturated units, the computer is a =
16197427 with=20
    BCC AUJP.&nbsp;&nbsp; Despite much effort, we cannot get a stable =
warm=20
    idle.&nbsp; The idle speed hunts up/down excessively, and the rush =
of air=20
    through the IAC sounds like a large household vacuum cleaner.&nbsp; =
The IAC=20
    is responding to the computer.&nbsp;&nbsp; With a carb,&nbsp; the =
engine=20
    used to idle nicely at 800 RPM with around 16 &quot;Hg.&nbsp;&nbsp; =
Learned=20
    IAC counts are about 40, and current IAC counts swing wildly.&nbsp; =
More=20
    throttle blade minimum airflow does not seem to help =
much.</FONT></DIV>
    <DIV><FONT size=3D2></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2>Thanks.</FONT></DIV>
    <DIV><FONT size=3D2></FONT>&nbsp;</DIV></BLOCKQUOTE></BODY></HTML>

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