[Diy_efi] Slow decay on idle on startup

[David M. Ingebretsen]

AMC 258 inline 6 (1990 Jeep Wrangler)
1227747 ECU (Howell kit)
Baseline EPROM is the ATKX stock

I have studied the online documentation and tips at the DIY-EFI site as well as 
the book from Custom EFIS, the calibration help from TUNER CATS software.

On startup, the idle is very high ~1500 RPM, and the IAC is retracted about 60 
steps or more. The idle does not drop to normal levels unless I come to a 
complete stop for about 30 seconds after driving for about a minute or so. The 
engine does not have to be hot or even warm I just have to drive for a bit then 
come to a complete stop.

I have adjusted the O/L idle on/off RPM, the IAC v. temp tables, the IAC 
kickdown delay timer and kickdown steps, min temp for closed loop, and other 
timers to no real effect. The paper describing the IAC operation was a good 
resource but didn't give me any better clues.

What is causing the high idle and why won't it decay until I stop dead for 
about 30 seconds?
Bye,

David

David M. Ingebretsen, M.S., M.E.
Collision Forensics and Engineering, Inc.
2469 Fort Union Boulevard, Suite 114
Salt Lake City, Ut 84121

(801) 733-5458


_______________________________________________
diy_efi mailing list
diy_efi at diy-efi.org
http://lists.diy-efi.org/mailman/listinfo/diy_efi