[Diy_efi] idle control 1227747

Bret Levandowski skishop69
Thu Mar 9 20:56:31 UTC 2006

Very true. Some scan tools cause it to default to that mode. Forgot about that. If he's using WINALDL though, he should't have that problem unless there's something wrong with his cable.  Ski

WopOnTour <wopontour at hotmail.com> wrote:  I dunno could you maybe be in 10K ALDL mode? IIRC Assembly Line Diagnostic 
Mode commanded a 1000 RPM, fixed timing and resulted in the bypass of some 
of the run timers such as EGR.
It was commanded by placing 10K ohms between the diagnostic terminal 
(terminal B on the old 12-pin ALDL) You don't have anything tapped into or 
connected to terminal B or anywhere else in the self-diagnostic circuit do 

----- Original Message ----- 
From: "Darryl M Gilbert" 
Sent: Wednesday, March 08, 2006 7:42 PM
Subject: [Diy_efi] idle control 1227747

> Hello: 1227747 355cu in SB Chevy. Trying to figure out how to get idle
> down to the idle speeds in the target idle vs coolant table. Currently
> ECM wants to keep the engine running approx 1100 RPM, with 80 IAC steps.
> Temp is at 171 deg F. TPS reading .51 volts at idle, but Idle speed will
> not come down to target idle table speeds?? Is there a switch that tells
> the ECM when to invoke the target idle table?? I think IAC steps vs
> Coolant is for Fast Idle when cold?/ Any help will be greatly appreciated
> Darryl..
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