I have a 2003 Nissan 350z, I’ve blown the engine and had to replace it. I found a similar engine from a 2003 infinity g35, so we made the swap… here’s where the problem came. we had everything bolt up fine like it should but the car is having idleing problems Im kinda new to this mechanic area we have taken it to a mechanic who helped us with the swap and he says that the car is having trouble synchronizing with timing and i need help trying to figure out what this issue is, could it be a ecu and harness problem? I’ve changed all spark plugs, coils, but we can’t figure out what the problem is. if I’m missing out in some information, let me know to see if it helps more with the problem

 

Welcome- moved your thread to a more appropriate forum. The first question to be asked is: have you pulled any codes from the onboard diagnostic system?

 

If the pins are the same and the G donor ran well the logical next step is to install the donor ECU.

 

you probably swapped two coil packs on the driver side, 4 and 6.

Also check your ground for coil packs is secure on timing cover.

 

Im new to this site as well, thanks! The car is in the mechanic right now being worked on. Hopefully he finds the problem

 

would I have to get the ecu and harness from the same vehicle that the engine came out from or could I get one from another g35

 

thank you for the advice I will give all of this information to the mechanic to see if it works thank you so much for the help