1G Where should I begin when buying someone else's project?

[90EclipsePos]

Sorry for the vague title not sure best way to put it. So just bought a 91 gsx from a guy who was the 2nd person to start this project. It originally was automatic and converted to manual. Bought it not running it has rebuild engine, 340 fuel pump, new turbo and larger cams and safc2 he also had a 2g maf installed and fmic. Having a hard time getting it to idle great. So since I have bought it here is what I've done. Had the ecu repaired and converted to eprom, new plugs gapped to .28, new tps, and new isc. I also swapped in freshly cleaned stock 450cc injectors. It looks like a new o2 sensor. Boost leaks have been taken care of. So not sure where else to begin. Any suggestions? It is trying to idle around 550-600 rpms. And while trying to adjust the idle I can't get it to change at all.

 

[lasershark]

Fuel trims can take a little bit of time to update. Depending on how long you ran the car it is possible it just hasn't updated yet. You can zero out the fuel trims by cutting power to the ecu, either by fuse or by battery disconnect.

It's been a while since I messed with mmcd but I do remember multiple ecu resets when I was tuning, to avoid the wait...

 

[90EclipsePos]

Yeah I'll try that again I did it once because the FTRL was locked at 139 it dropped down to 117 next time I drove but climbed up to 130 but will try bumping it up to +30 and drive it again. Thanks again for your help.

 

[motomattx]

It takes 16 minutes of actual running time in each area for each fuel trim to fully update, for example 16 minutes of actual idling without touching the throttle at all to fully update the low trim, 16 minutes of mid range cruising to fully update the mid trims...

 

[90EclipsePos]

It takes 16 minutes of actual running time in each area for each fuel trim to fully update, for example 16 minutes of actual idling without touching the throttle at all to fully update the low trim, 16 minutes of mid range cruising to fully update the mid trims...

That is great information that will help a lot.