I have a 2004 4.8L DBW engine that I am looking for some advice before going to a Holley terminator X setup. The engine is an LS swap in a 1967 Nova. I first started with a 12606960 OS and had an issue with the idle not dropping down to the commanded idle speed. I then changed to an 12592618 OS from a family members 2005 Silverado that fixed this fairly common issue. I am still experiencing a couple issues that I'm not sure can be easily solved, but figured I would ask the forum before going a different direction for my application. The issue with this OS is that when the APP reads ~66% the TPS reads 99.6% this is due to the nature of the Silverado and how it pivots and bottoms out on the floorpan at WOT. In my custom application with the accelerator pedal modified, it is a lot more sensitive. The '06 OS has a close to a 1:1 relationship between the APP and TPS. I tried the 12587811 which gave a lot better pedal feel, but could not fix a 2k+ rpm flare at startup hot or cold no matter how much air I removed from the initial airflow/friction startup table. Lastly, the car has air conditioning and I do not have a trigger to the ECU to update my airflow when it kicks on and causes quite a stumble when coming to a stop.
With this said, is there an ECU that has a better APP to TPS relationship, a/c trigger, and will return to a commanded idle w/ blue and green connectors? I have tried a lot of different things as you can see to get my LS swap to work, but after just performing a Terminator X swap recently on my other Nova, I think this may be the easiest route. I have spent a lot of time and money on credits as well as ECU's. Please advise.
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Originally Posted by SiriusC1024
