First off... Many many many thanks to robertissar for all the fantastic posts. You sir, are amazing.
Ok the issue... the IAC step value never seem to change in TunerPro. It is always at value of 17 whether engine is idleing or driving. This is a bummer as I'm trying to troubleshoot a low idle. In all other respects TunerPro working great... Made the cable using the Arduino RS232RL, and eliminated glitches in datastream by adding pause line. (all per robert)
Could this indeed be my engine? or might this be an issue with the definition file? I unplugged the IAC and the engine idles very high when I do, so I do think it is working at least somewhat. I am using the 16172693.adx file off the TunerPro site. My car is a 1993 3.4L L32 manual Camaro.
I noticed that both the IAC Position and IAC Minimum value settings are the same (in terms of packet offset, etc...) So wonder if they are set correctly.
Hey... whadaya know! Fixed it! Problem was in the definition file after all.
I dug up a very old "Data Stream A215 Specifiation from 1993" after a couple of google searches and saw that a few of the word #'s for the values in the definition file didn't match. Also found at least one conversion on BARO wasn't right...
Can't believe I actually did that as I am such a newbie.
IAC does appear to be getting proper signal at least. Now if I could figure out how to send a command to it to move at will, that would be an awesome test.
