I have a Dodge Challenger 2010 3.5L, it has a new cooling system, changed the sparkplugs and ignition coils, one of the O2 sensors was bad(bank 1) downstream, changed it as well. Then it started giving me a lean code in bank 1, with the codes P1128/P1129. Checked live data, it shows the fuel injector for bank 1 giving exactly half the fuel from bank 2. Is it a bad fuel pump or filter? Or could it be maybe the oxygen sensors not working? It started giving me codes for other sensors. Keep in mind the car is tuned up and doesn’t have catalytic converters, the computer is programmed for it.
so many things can do that but if one side is running different than the other you have to pinpoint what's wrong with that side can't be a fuel pump cuz it would affect both sides it's got to be something that affects just one side like a bad fuel injector leaks on the intake system bad valve something that only affects one side of the engine
I bought a car that is tuned up, changed the headers and took out the catalytic converters, if the car had previously dummy O2 sensors and then i changed one of those sensors for bank 1. The exact day after it started giving me a lean code in bank1. Could it be the sensor ? I know it kinda answers my own question but just want to make sure. Would i have to change the other side too and then tune up the computer so it reads it right and doesn’t make my car run bad or trigger a code?
Snark comment here, please forgive me:… never buy a tuned car, … ever! Unless, of course, you are a tuner yourself, … with enough experience being a tuner!
F.S.
@figmund-sreud
I agree with you, some cars tuned as pressure cooker. Drive, then, BOOM!