Still have some problems - ahy ideas?

[Ken Kelly]

Roger,
	If we're guessing, let me take a try. Just a stream of
consciousness dump! What magic happens at 5 to 8 minutes.
Did you look at EGR and Vapor recovery systems. Do changes
in these correspond to the 5-8 minutes? I would think you
reach normal operating temperatures in less than 5 minutes.
How cold is the ambient? Does it take 5-8 minutes to reach
180 degrees coolant temperatures. The Idle speed table is
speed vs Temp, how is the temp tracking the 5-8 minute time?

		Ken

Roger Heflin wrote:
> 
> On Wed, 8 Dec 1999, Programmer wrote:
> 
> > >>It will run this way for
> > 5-8 minutes (the IAC will  e maxed at 160, MAP will be somewhere
> > around 18-20), then all of a sudden the MAP will drop from that range
> > down to 13-15 and the computer will then be able to control the rpm
> > with the IAC valve (IAC is no longer maxed<<
> >
> > Here's what I'm thinking---your IAC is supposed to open up KOER, but perhaps
> > it really isn't ?? All a scan tool shows is "commanded IAC" or what IAC
> > position should be--the later ones showed a preferred IAC setting, and then
> > an actual IAC setting on the scan tool. This would "explain" why your MAP
> > drops as the IAC breaks free from a stuck pintle seat. Or is it possible (if
> > this is a reworked ECU from the stock one), that the wiring is reversed at
> > the IAC ? 160 is seated--lower numbers are moving the pintle away from the
> > seat ?
> 
> Stock ecm, prom is modified.  When I had the plumbing off the whisting
> increased with the opening of the IAC which I take to mean it was
> working correctly.   The IAC is also a new one, the old one had the
> same problem, I cannot tell if something got worse (lifters/intake
> issues) or if it just got colder (not rich enough).
> 
>                         Roger