[Diy_efi] idle control 1227747

Rick McLeod dunvegan
Thu Mar 9 02:52:20 UTC 2006

i believe there is a target idle rpm vs. coolant temp table, what values are in it?
  also, p/n switch, is it working,?
  have you set up base idle speed, meaning is it being mechanically held up there? most have a connector to open and then set up base mechanical idle (be sure to reset iac pintle per procedure), then set up tps according to procedure (I thought it was .5V)
  make sure you don't have a vacuum leak, could cause a high idle similar to mechanically advanced idle speed stop, the close-loop would smooth the mixture thinking it was supposed to be running that speed
  i would start looking for a path of air somewhere other than the throt-body and iac, have seen that due to cracked non-ported vacuum especially the line to fuel pressure regulator, will also sometimes suck fuel if a minute leak in diaphram
  good luck, hope this gives U some ideas

Darryl M Gilbert <dgilbert78 at juno.com> wrote:
  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
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