14-06-2020, 03:35 PM
Good to hear you got it running. Key sensors in mixture regulation apart from lambda are the coolant temp sensor, MAP (manifold pressure) sensor, and TPS (throttle position) sensors. Coolant temp would be the first suspect to check with significant over-fueling. They aren't particularly expensive to replace. It's the one with the green connectors on the thermostat housing.
Just had another thought. The XU10J4R came with 2 different sets of injectors. Earlier versions had 186cc injectors and later versions had 200cc injectors. If the ECU didn't come from the same car as the engine then they might not be a match. An ECU that thinks it has 186cc injectors but in reality has 200cc injectors wouldn't (from my understanding) be able to adjust the mixture to stoich. (The MP5.2 ECU apparently only has a very limited range of adaptation).
Just had another thought. The XU10J4R came with 2 different sets of injectors. Earlier versions had 186cc injectors and later versions had 200cc injectors. If the ECU didn't come from the same car as the engine then they might not be a match. An ECU that thinks it has 186cc injectors but in reality has 200cc injectors wouldn't (from my understanding) be able to adjust the mixture to stoich. (The MP5.2 ECU apparently only has a very limited range of adaptation).