I had an interesting thought... Since I know the throttle blade is at the correct point to get my idle counts in line... what if I could "flow bench" the TB as an assembly? I could then get a measurement as to how much air is moving through the throttle body in a controlled environment.. Then, I could readjust the throttle blade to get the .65 TPS voltage that I need, and then start drilling the bleed hole larger until such a time that I hit the same measurement from the initial test.. Anybody got a flow bench in Houston Texas I can borrow? How about making a home made bench out of a shop vac? How to make up a way measure the amount of air flowing through the throttle body... Now THAT would be cool. Wait a minute.... I have a MAF meter on the car... Maybe I can figure out a way using a shop vac to measure the air through the TB by watching what the mass aif flow meter is showing in the HP Tuners scanner!!!! Somebody, help me McGuiver this bitch! Does anyone think an idea this crazy will work? Will a MAF meter register air speeds as slow as what a shop vac would produce? I'm wondering if this could be done...

 

Okay.. Just an update.. I measured the factory hole in the throttle blade at .154"... I opened the hole up to .170". I did the TPS relearn-KEY ON with both TPS and IAC disconnected, then key off. Reconnected the TPS & IAC without bolting the TB back on the engine. Scanning with HP Tuners watching TPS voltage and percentage. Started at .88V and 2.4%. As I back the set screw out, in order to get down to .65V, the blade is TOO FAR closed and is sticking when you try to open it. So.. looks like I will have to slot the TPS after all. I did not want to have to do that but it's now apparent that with the throttle blade closed that far that it's not going to work. Going back out to work on it now.

 

Updated log. Looks like at operating temperature, the IAC counts are 0-5 in that range. I got the fueling under control, and it's close. I just went back in and reduced the idle fueling areas just a tad bit more so this log still shows that the fueling was a little off. Car idles. Cleanly.

I also just adjusted the RAF #'s again based on this log. I'm slowly whittling it down. Looks like I can now move on to data logging with the wide band for fixing the rest of the VE table. Going to wash the car and drive it today while I'm doing the data logging.

 

Just to close this thread out for others that have found it... In the end... it was a bad IAC.. The IAC was a used one that was on the T/B when I bought it... I had no prior knowledge of the IAC, or history. I finally figured it out when I had the T/b off the engine and was trying to use the controls in the scanner to close the IAC completely and while holding the T/B in my hand, with the wiring still plugged in of course, the IAC stepper motor would not close or open as it was being commanded. I then bought a new one from Rock Auto.. Waited several days for it to arrive... Installed it, and started the engine. It revved up to 3500 on a cold start and would not idle down... Again... Bad IAC.. Brand new CHINA JUNK right out of the box and it was stuck in a position that would not allow it to close... Went to the junk yard and got a used IAC off a chevy suburban... Installed it and VOILA! It works! I set TPS voltage to .55, and TPS % shows "0" at idle...I deleted ALL of my previous tuning attempts as I realize NONE of it was good data because of a bad IAC... I basically burned an all stock tune onto the car, deleted fuel from the VE tables. Burned it, car started up and instantly idled as it should... Went and drove the car to do data logging, and it runs, drives, and returns to idle perfectly.

Bad IAC was the culprit the entire time... Was not setting any codes... and no way for me to see that it was not following any of the commands it was receiving. The fact that I got another supposedly NEW IAC and it was bad right out of the box IS MY LUCK TO A "T". This is just how things go for me.