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Should I be concerned? My fuel trim bank 1 is 25% long term, and bank 2 is 9.4%. I recently got longtube headers installed and the car has been running like absolute ****. It idles ok but any load above 1800RPM the car sounds like a harley, not a smooth consistent sound. Like bubble wrap. I ran seafoam through it and im about to clean maf. Is this just normal header sound pre-tune? Is the fuel trim ok that far apart? Sorry for so many questions. Theres no misfire code... If that matters. I dont know what to do besides spark plugs and wires but I dont want to keep blindly throwing money at it.
1998 trans am ws6 a4 60k miles
Last edited by SouthernRex; 05-23-2017 at 03:16 PM.
I have front O2's but no rear's because this is a catless header/ypipe. They both move around a lot while driving, but they look a bit different in pattern. Is there anything I should record or look for with the O2s?
This is the data from the O2's at idle and with some light rev pulls. Does all of that seem normal? I'm losing my mind here. See how Bank 1 is more radical high and low? Does that mean anything? I want my car to stop sounding/running like this. >
UPDATE: It finally threw me a code, P0153 02 SENSOR CIRCUIT BANK 2 SENSOR 1 Slow Response
Last edited by SouthernRex; 05-23-2017 at 06:12 PM.
05-23-2017, 01:47 PM
Fuel trim bank 1 much higher than 2 
