Car dieing additinal info.

[CSH-HQ]

Some use a flull lenght of oa 259 couns for retraction .
Bruce


>IAC's typicaly stick where ever that are at the moment.
>
>The motor is a 2 phase stepper motor the is on a jack screw shaft.
>
>The 160 steps for open is typical for a car, the compter commands the IAC to
>this position after key off, (the ECM runs for a few second after shutdown).
>
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>On start up, the IAC moves rapidly to a value looked up on a  steps vs
>coolant table. 
>
>After specific qual's are meet the IAC will go into ist own closed loop
>mode, regulating RPM looked up from a new table, RPM Vs. Cool. Late vehicles
>have 4 different target RPM tables.
>
>I recomend that you check your MAP in gear and out of gear, S/B 35 - 40 Kpa,
>about a 5 kap diff in Vs out of gear. 
>
>This probelem you describe is not typical of any IAC failue I've seen. More
>like a Vacuum leak. 
>
>I would also check fuel pressure. Do theis with the key on and motor off.
>System should hold pressure overnight. 10# drop in 5 min's is a fail.
>
>Ward
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>On Tue, 10 Aug 1999 10:33:06 -0500 (CDT), Roger Heflin wrote:
>
>> 
>> I have noticed  that whatever is going on with my car dieing, that it
>> does seem to be alot more troublesome when it is hot outside (100
>> degrees) over when it is cooler (say 80).
>> 
>> I should have new IAC tonight, and it is pretty trivial to install it,
>> so I should know if that fixes it tonight.
>> 
>> Now on the IAC 160 is open and 0 is closed, where is it on startup and
>> which way does it usually fail (open or closed), or can if fail either
>> depending on why it failed?
>> 
>> And if it  is slipping, then that would imply that if the computer
>> kept signaling it to change (even though it thinks it is a 0 or at
>> 160) that it would offset the slipping, and possibly make things still
>> idle even with a bad IAC, at least until it gets so bad it does not
>> move at all?
>> 
>> 		Thanks
>> 		Roger
>> 
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