Originally Posted by
1great40
Hi all. Today I installed the PROM that Eagle Mark cooked up for me, just to see how the truck would run. The good news is that it runs exactly like the stock PROM. The bad news is that it runs exactly like the stock PROM. The whole point in having the custom PROM was to have the idle set to 725 RPM. I know he addressed things like EGR, AIR, etc but I was disappointed that there is no change in the idle speed. I'm not sure what I'm missing here. What sort of magic does it take to change the idle speed? The odd thing is that when I first tried this prom, I was observing the RPM with an Actron scanner. That scanner only works in 10k mode. Mark told me he defaulted all the idle values to 725, that included the idle speed in 10K mode, which is usually 1000 RPM. When the scanner was attached, the engine idled at 725 RPM in park and 725 RPM in drive.
Anyone have any suggestions?
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