ok....i have a turbo'd single cam and the car has been running great.....im using stock injectors with a FPR at about 40 lbs of pressure,ive been running it this way now for quite sometime...im boosting at about 7lbs but just recently my check engine light came on and the car started running really lean just outta nowhere,i changed my fuel pump and filter but its still running the same...im scared of detonation and im very curious why this is doing this.....also the check engine light has only came on like 2 times outta the 5 ive driven it so far like this...also its a 43 code which is fuel supply system...

can someone please tell me why my car is running this way,also the car runs great still....

 

What is your fuel management?

 

nothing really,just the adapter for the map sensor,and FPR...i know i need a FMU but its been running perfect till about 3 days ago,and i was just curious why this would come outta nowhere...ive troubleshooted everything i can think of and still i end up nowhere...also the plugs arent white they're in pretty good shape,i also noticed when the check engine light comes on it runs a little richer

 

might be your O2 sensor.

 

 

also i dont even start hitting boost till like 5k dont know whats thats all about either....im gonna be getting some b16 injectors soon so i think that should help a little...also i would like to bring it somewhere where i can get my setup checked out to make sure its all ran right...i was told that the reason its reading boost so late is that i probably have no vacuum going to the turbo...if anyone could just check it out for me i would greatly appreciate it,im kinda new to the turbo scene....