[Gmecm] Re: +AFs-Gmecm+AF0- 2.5L 151 TBI'ed +ACY- Working Great, but...

[Aphelion79]

Any ways to test the IAC?

Jared Ryan wrote:
> TBI doesn't fast-idle nearly as fast as a carburetor.  The maximum
> fast-idle speed in my 9C1 '746 calibration is 1400 rpm.  The fast-idle
> specification for my car with the factory QuadraJet was 2200 rpm. 
> That's a huge difference.
>
> I like not having the engine run so fast at start-up, and not having
> to bump the accelerator pedal to get it to slow down.  The ECM does
> that all by itself, using the IAC motor.
>
> The normal idle speed can vary.  The ECM has tables that let it change
> the idle speed according to temperature and whether or not the air
> conditioner is running.
>
> On Mon, 14 Aug 2006, David Allen wrote:
>
>> In my experience, TBI engines don't fast-idle nearly as fast as a
>> carb engine.  The ECM uses the IAC motor to add extra air to make the
>> fast idle.  The amount of extra air is determined by coolant
>> temperature.  There is a table in the calibration for this function. 
>> If the IAC is frozen the engine will run fine but the idle will be
>> fixed and not able to respond to changes in load or temperature.
>> Hppe this helps!
>> David
>>
>>
>>
>> > Ok, got the check engine light figured out... got my oil pressure
>> sender
>> > figured out... only problem now is on startup it doesn't "fast
>> idle"...
>> > can anyone explain to me why this would be and what I should check for
>> > (or how even works lol)...
>> >
>> >    +ACo- Idle Air Control maybe?
>> >    +ACo- Is there a sensor that would send info to the IAC that it needed
>> >      to "fast idle" in the first place until the engine got "warmed
>> up"?
>> >    +ACo- Does it only fast idle in cold weather?
>> >
>> > Those are the only things I can brainstorm about it ATM lol...
>> >
>> > If it is some sort of sensor, how would I test them to see if they're
>> > working properly?
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