Hello from Germany!
I got a LS3 crate engine with a E67 ECM (from GM Performance) and all work fine. Now I'm trying to get a LS3 with a E38 running. The parts are from GM, only the MAF sensor ist GM Performance.
The Idle is very poor, including backfire and an idle RPM between 250 and 1250. So I disconected the MAF and the Engine was runnig better.
My first step was to read out the MAF MAP and IAT tables from the E67 and write it to the E38. As a result, the idle was a little bit better but not satisfyfing.
The IAT was 10°C to high. Is the Map value relativ or absolut? should it show 0 or 1013hpa when the engine isn't runnig?
I'am wondereing also about the TPS. The values are between 25% and 88% on both ECM. is that correct?
I hope i'm on the right way, and find someone who can help me to solve this problem. And sorry for my english