[Gmecm] Idle problem

[Tomas J. Sokorai Sch.]

On Monday 22 August 2005 12:03, Programmer wrote:
> 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...

How is it that 750!=3D750? ... I have this problem too: I just did a swap f=
rom a=20
carb to a 7747 ECM + TBI on a Ford 302, and the set the idles to about 850R=
PM=20
(a bit bigger than stock cam), and I get about 1200 RPM no matter what I do=
=20
too. The IAC speeds the thing up whenever I do something to lower it.=20

I'm sure the P/N switch signal is in "N", and the ALDL data doesen't show a=
ny=20
VSS pulses.

The closed loop also kicks in at a temp much-much higher (about 85=B0C) tha=
n=20
what the calibration says (35=B0C). Why these discrepancies?

=2D-=20
Tomas J. Sokorai Sch.
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