I apologize. I didn't mean to lead you to believe I wasn't listening to your advice. Your advice has been extremely helpful in helping me along the way to pinpoint the issue. While going to the stock throttle body has resolved 90% of my issue, I don't believe i'm 100% in the home stretch. I do thank you for all the info you've provided thus far and all the help you've given so many other people on the form. Your posts are unbelievable helpful! It's awesome that individuals such as yourself and shoebox go to great lengths to help so many others. It's something that is rather hard to find today.

 

OP, assuming your stock TB has the blade stop screw restored to its factory position (you could check what your TPS VDC says) you "may" need to enlarge the IAC air inlet hole. Generally with a Hot cam you do not but if reading IAC counts are higher than you want and with AC on or while enabling PS the IAC counts peg causing the motor to idle to low or stall than you could enlarge the hole 1/64". Then measure your IAC counts again to see if they dropped within range

Again I doubt you will need to do this with just a Hot cam though

 

Yes, since my displacement didn't change I find that strange that I would need to drill it out more.

GOOD NEWS! I finally got the GDScan to work and can do the logging and such properly. Couple of things that seem strange.

I may be totally oblivious but I can't find two items referred to previously in the GDScan app - that being knock count and target engine idle speed. Also is it normal for the IAC counts to show up in the 96/97 v6 row as opposed to the other IAC row?

I've attached a couple of log files, if anyone is curious to take a peak!

 

I asked GaryDoug to take a look at these files to see if they are complete. Appears you converted them to Excel. I've reviewed 100's of data logs for people, but most of them have been from his OBD-1 app. That produces a file with 52 columns of data, with things like target RPM, IAC, minimum IAC, a list of codes, etc. Also need to bump up the scan rate. You have about 1.5 frames/second, and that is too low to provide the visibility of relationships between parameters. Hopefully the rate can be increased to at least 5 frames/second, or more.

Is your AIR pump deleted? Are your cats deleted, and hence the after-cat O2 sensors deleted?

 

This car is an OBD-2 one and the OBD-2 standard only gives the measurements that can effect the emissions. But that is still most of the important ones. This applies to all cars after 1995 but some cars may have a few more or less depending on the design. These appear on the Live Data page only.

The PCM can also deliver other readings that do not appear in the standards. That is similar to the OBD-1 ones from the previous years. Unfortunately the "Enhanced" page does not have addresses for all cars in the range of use. So it just has the addresses and scaling for a few useful ones. The 96 and 97 may be somewhat lacking in that regard, bring an LT1 with OBD-2. I may be able to give you some addresses for those and you can enter them manually but you will only get the raw data, not scaled to any units of measure. The scan on the Enh page sends a request for data according to the address found in the table, If the pcm responds with a "not found" error, the app labels it as not "supported". Now, that can be just because the address is incorrect for that car/year or it can be that the value is not provided at all. Or it may be that the address for the V6 happens to be the same for a V8 in 96/97.

Also, this scan is inherently slower being OBD-2 because it requests/retrieves the data one value at a time unlike the OBD-1 scan that retrieves all values at once. If you only need one or two values, OBD-2 is usually faster. If you need them all, OBD-1 is faster. To make the scan faster, uncheck the values you don't need.

 

I was right, the address for the 96/97 V8 is the same as for a V6 of that year. The address in the table for the V8 is wrong for 96/97 V8.

Here is a file showing the addresses I know about for the 96/97 V8. The last 4-character value in each line is the address. Only a few values in the default table have calculations for the final value, All others just show the raw data (not scaled). To add or correct the ones in the table before a scan, edit the address and descriptions in the table to match these. Make sure to enter it exactly as shown, in hexadecimal. To remove a value, just clear out the line in the table. This page was meant to be a way for advanced users to enter their own scan addresses, since they vary considerably between years and engine sizes..
By the way, 96 and 97 have the same data.

 

Thanks Gary for the list of additional items. They seem to work pretty well!

Update: drilled the 58mm throttle body and slotted one of the tps sensors I've got and have it sitting within .2-.9 volts (thanks injuneer for this info. Found it another one of your posts!). Have the IAC counts back in check. Warm idle is around 30 depending on load (in gear or ac on) car is idling steady at 800rpm. Still a tad low on vacuum, but I've done tons of reading and found that I can likely get the vacuum up and probably lower the idle speed by advancing the spark at idle. Pretty sure my path moving forward is fine tuning. I did have a date set for a Dyno tune, however I found out they use hp tuners which isn't compatible. So I've ordered jet dst and will likely get the elm pro diag tool, unless I can skate along pretty well using Gary Doug's program.

Thank you everyone for the help in this never ending LT1 Optispark journey!

 

This info gives me some direct for my 94 wagon . I have a 383 lt4 heads and intake 847 cam and pcm4 less tune . It doesn’t like to idle either if u turn steering wheel at idle it stalls. You never mentioned the converter u r running ,mine is. A 2800 but it has cam surge if running at steady highway speed. Keith at pcm4 less says I need to go to a 3600 converter. I really don’t want to go higher than my 2800. Is he correct. If so I’m going to get a smaller cam

 

find another tuner....

sounds like your IAC pegs if it stalls when turning (load on power steering)

If you have a larger TB than you need to do the "drill mod" or crack the blades trick to correct IAC counts back to 32 (30-35). The crack the blades thing is sketchy as you also need to slot the TPS to get VDC right so tranny shifts correctly

Put the stock TB back on...if problem goes away it was your TB