I've got this small case of oscillating idle when in park or nuetral when I first start it.

I have info on setting the IAC reaction time, and I want to try delaying it. I tried to edit the chart in WinBin but I won't let me select any cell, and there isn't an option in the menu's

How do I change it then?

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'92 Astro, GM crate 350, Performer TBI intake, MSD 6AL, 3.42's, 2.5" exhaust, Flowmaster 40 2 chamber, B&M 2nd stage shift kit, 255 60 R15 tires on AR-727's, Polished & Bored TBI, Custom EPROM in progress

 

You can actually edit the "hex" data a variety of ways. There are free hex editors available on the internet (do a search at www.download.com) and with the Pocket Programmer there is an "edit" feature.

However, if you DO actually edit the hex code, you must then compute the change to the binary file and modify the checksum.

 

This is a great editor, not only for HEX. It is great for anything ...

http://www.ultraedit.com/



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Jonas Bylund

 

One reason it's revving up and down at idle could be the timing is not the same in that RPM range. Look in the timing table at the RPM and VE range this happens (using the RPM that you are requesting at those coolant temps), and the timing is probably higher than when the engine's idling at a lower speed when warmed up or when you're in Drive. I had that problem with my engine, also only in Park (I have a 150 rpm difference between Park and Drive). I set the timing in all of the affected RPM/LV8 cells to the same value and the problem pretty much went away. It still oscillates some, but within a reasonable 50-75 rpm range instead of 100-200+ rpm.

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Greg Westphal
'87 IROC 355TPI/A4