bank 2 reading lean help me please???

BlackGT-R · Jan 23, 2004

Ok heres what i have found out so far, i went down to ford and they scanned the code, it came up as my 02 sensor on bank 2 was reading lean... ever since then i get the worst gas mileage ever im barely getting 210 on basic normal driving.. heres a list of my modifications, K&N, C&L MAF, C&L true flow pipe, BBK 70mm TB, C&L upper intake manifold Steeda Intake Spacer, off road H Pipe, and Mac cat back exhaust... I've heard things about C&L MAF sending codes and throwing a SES Light up on the dash, so i wasnt worried about it until i notice the huge loss in mpg... please anyone know how to fix this, i'm dying here i heard someone say to buy a pro-m remote optimizer to even out the a/f ratio.. any other suggestions,. please help with this one.... thanks

BlackGT-R · Jan 24, 2004

bump,.. please anyone i need help with this problem,.. thanks

trublustallion · Jan 24, 2004

BlackGT-R said:
Ok heres what i have found out so far, i went down to ford and they scanned the code, it came up as my 02 sensor on bank 2 was reading lean... ever since then i get the worst gas mileage ever im barely getting 210 on basic normal driving.. heres a list of my modifications, K&N, C&L MAF, C&L true flow pipe, BBK 70mm TB, C&L upper intake manifold Steeda Intake Spacer, off road H Pipe, and Mac cat back exhaust... I've heard things about C&L MAF sending codes and throwing a SES Light up on the dash, so i wasnt worried about it until i notice the huge loss in mpg... please anyone know how to fix this, i'm dying here i heard someone say to buy a pro-m remote optimizer to even out the a/f ratio.. any other suggestions,. please help with this one.... thanks

is your car making a noise ? i have yor problem too, but mine sounds weird on the driver side

BlackGT-R · Jan 24, 2004

what kind of noise are you talking about,.. i havent really heard, anything all know is the car says its running lean, but the lack of gas mileage makes me think its running pig rich,.. i dont kow what to do,.. something is messed up and i have no idea what?

jstreet0204 · Jan 24, 2004

More than likely it is just your 02 sensor. Try swapping the front two sensors, disconnect the battery for about fifteen minutes and see if the code changes to bank 1. Autozone will scan codes for free so you don't have to keep going to the ford dealership.

BlackGT-R · Jan 24, 2004

will bad o2 sensors cause my car to lose a dramatic amount of mpg,... ????

lman657 · Jan 24, 2004

jstreet0204 · Jan 24, 2004

BlackGT-R said:
will bad o2 sensors cause my car to lose a dramatic amount of mpg,... ????

Yes, if the EEC thinks the bank is running lean it tries to compensate by adding more fuel.

Sam98 · Jan 24, 2004

BlackGT-R said:
Ok heres what i have found out so far, i went down to ford and they scanned the code, it came up as my 02 sensor on bank 2 was reading lean... ever since then i get the worst gas mileage ever im barely getting 210 on basic normal driving.. heres a list of my modifications, K&N, C&L MAF, C&L true flow pipe, BBK 70mm TB, C&L upper intake manifold Steeda Intake Spacer, off road H Pipe, and Mac cat back exhaust... I've heard things about C&L MAF sending codes and throwing a SES Light up on the dash, so i wasnt worried about it until i notice the huge loss in mpg... please anyone know how to fix this, i'm dying here i heard someone say to buy a pro-m remote optimizer to even out the a/f ratio.. any other suggestions,. please help with this one.... thanks

In your case it sounds like you really do have a bad O2 sensor (driver's side, closest to the engine). The O2 sensor voltage is probably too low, and the PCM keeps dumping fuel on the driver's side to correct it. The net result would be you are running way too rich which will trash you mileage. Generally, if you have a problem with the MAF or a vacuum leak, the engine really will run lean which will improve your mileage.

I keep my car tuned to run at 14.7:1 unless I start getting on it, and when I do my A/F drops quickly to 11.5:1 and stays there. Tuned this way my car gets 19-21 MPG around town. I tried running the car constantly in open loop @ 12.1:1 and though the drivability and throttle response dramatically improved, my mileage dropped to 14 MPG. I didn't leave it that way for long, but the A/F ratio can have a profound impact on mileage.

BlackGT-R · Jan 24, 2004

ok so all i have to do is replace my o2 sensors, sweet deal,.. thanks so much guys,.. huh! wonder if ford will replace them for free hahaha!!!

Sam98 · Jan 24, 2004

BlackGT-R said:
ok so all i have to do is replace my o2 sensors, sweet deal,.. thanks so much guys,.. huh! wonder if ford will replace them for free hahaha!!!

There's only one way to find out for sure... If they don't your problem is only with the front sensors...

trublustallion · Jan 24, 2004

if you have after market exhaust, and no cats like i do, they wont. but then again, alot of you have better dealers than i do. good luck

Sam98 · Jan 24, 2004

trublustallion said:
if you have after market exhaust, and no cats like i do, they wont. but then again, alot of you have better dealers than i do. good luck

No dealership should be willing to work on any car with an illegal exhaust system unless they are making it legal again. They can get fined for it if they get caught...

Chris00GT · Jan 24, 2004

BlackGT-R....if you want you can bring the car down to our shop www.kauffmanmotorsports.com and we can hook our data logger up and see what the car is doing to cause the code. We can see if the 02 is bad, or is any one of your mods are causing the problem.

bank 2 reading lean help me please???

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