chejos13ls1

iTrader: (4)

ok,straight to details, 99 ls1 swaped 240sx running on speed density tune,also running only on the 2 fronts o2 sensors,edelbrock fuel rails with a aeromotive fpr,(pic attached for reference), frost tune for all of that, car is been running for at least 2 years now, never had this problem.

Car is bogging and sometimes backfires,and its really low on power,it all started all of a sudden,also when i removed the spark plugs only the the driver side bank(1,3,5,7) where super rich(more like completely black) ,passenger side plug's (2,4,6,8)looked normal,i've checked voltage on the fuel pump,voltage on the coils,and did a visually inspection on the o2 sensor on the driver side bank.....any other ideas?





the return is at the bottom of the regulator, the feed will be running to the 2,4,6,8 injector bank first, then tru the crossover to a dead end at the back of the 1,3,5,7 bank


thanks in advance

chejos13ls1

iTrader: (4)

anyone??

joecar

Swap the O2 sensors between banks and see if the problem follows the sensors.

Old Geezer

iTrader: (3)

Data logs?????

chejos13ls1

iTrader: (4)

problem solved,i insatalled an spare o2 sensor that i had handy and the problem went away,thanks a lot guys