I got the ARAP bin off Craig Moates site, did a few changes and burned it. Now my idle in neutral is 1200 RPMs. What is causing this; my old chip never did this.

 

Check your idle tables vs. temp, my modded ARAP runs 650rpm at temp, but around 1200 or so cold if I recall.

 

I did not change that table

 

Your best bet is to always start with a clean unmodified PROM. Most of the people in this forum that tune PROMs do so for just their engine. It is highly unlikely it will work well with another engine.
J

 

You start with a clean unmodified bin, that way you have a base line. Starting the way you did you have no idea of where you're at. Some AFR/ timing changes can be enough to change your idle to some degree. You also need to drive each eprom change to make sure the ecm relearns the BL and resets the IAC.

 

Umm.. the ARAP from Craig's site is an unmolested one folks.

Hard to say without more info.... Have you exhausted any searches for possible vacuum leaks?

 

I believe that's correct, unmolested. But he made some changes before running it...

I'd say the only things you might want to change before running it for the FIRST time are the FI constant, VATS switch, and fan on/off inversion. Once you get a baseline, you can go from there.

 

I diff'ed it with an arap from the GM ECM site and it was way different in the call section. I didn't even think it was an arap at all.
J

 

I just checked the two ARAP files on the DIY site against the one on my site, and they are all 3 identical. Anyone have information to the contrary? I'm not sure what is meant here.

 

Sorry about that......I was thinking of a different thread. I did this for a different bin. I have never diff'ed the image at Craig's site with the one from the GM ECM site.
J

 

Yeah, I checked it when I originally downloaded it from Craig (thanks for hosting it BTW ) last year just because of not wanting to make that very mistake and it checked out as untouched. But the underlying point is a very valid one. Making sure you have a known good, untouched bin to start with, is an absolute must.