Had a engine replaced now it’s all messed up

[Cosmic84]

I have 2011 Chevy Malibu LT1 2.4 ecotec gas engine that needed a replacement. The mechanic Ordered and installed used engine. Got the car back ran fine but was getting check engine. Code was running lean. So they looked at it and realized they installed a used Flex fuel engine . Installed flex fuel injectors to compensate, now it's running rich. For the record this is a whole debacle bc I want to run regular gas not E85. But by putting the bigger injectors and having the ECM run on original program isn't it just gonna pull more fuel now with the over sized injectors and that in turn is why it's running rich now. Is this feasible to make this engine run correctly. Shouldn't they have just left the original injectors and figured out the real reason it was running lean. Bc my research finds that if you want to run normal (non-E85) fuel in a flex fuel engine, you would leave the original injectors and not have upgraded to the bigger flex injectors correct? And leave the ECM to it original programming? bc in theory upgrading the injectors and reprogramming ECM for flex would be not good running regular gas. I should bitch at this point right for a new used engine(non-flex) like my original engine was. This was their fuckup. What would you do and what are your thoughts on this rich lean condition debacle. Thank you.

 

[watchbearer11]

Oh damn, they messed up big time and left you with a headache. Yeah, this combo is a problematic one and you'll continue running rich and the engine will run poorly. One thig is to go back to the previous injectors, but that requires more manual labor. I'd go with an ECM reprogram to set everything straight and to have a decently running engine.

 

[below.zero]

Yeah,you need to have the right injectors and ECM tune. Honestly, they should've sourced the correct non flex engine like your original, or at least kept the stock injectors