Hunting Idle

Sun Nov 1 19:04:35 GMT 1998

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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.

Thanks.

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<DIV><FONT size=3D2>Any help with this would be appreciated...........I =
am working=20
with a mild MPFI 427 big-block project.&nbsp; The engine and cam are =
fairly=20
conservative,&nbsp; the induction system is from Accel,&nbsp; the =
injectors are=20
30 #/HR SVO saturated units, the computer is a 16197427 with BCC=20
AUJP.&nbsp;&nbsp; Despite much effort, we cannot get a stable warm =
idle.&nbsp;=20
The idle speed hunts up/down excessively, and the rush of air through =
the IAC=20
sounds like a large household vacuum cleaner.&nbsp; The IAC is =
responding to the=20
computer.&nbsp;&nbsp; With a carb,&nbsp; the engine used to idle nicely =
at 800=20
RPM with around 16 &quot;Hg.&nbsp;&nbsp; Learned IAC counts are about =
40, and=20
current IAC counts swing wildly.&nbsp; More throttle blade minimum =
airflow does=20
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></BODY></HTML>

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