Bank 2 lean code runs rich
Thread Starter
Teching In
Joined: May 2016
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Bank 2 lean code runs rich I have a 99 camaro with a 01 ls and t56. Car was originally a v6 five speed. The swap went well but I'm having problems with it not running right.
The motor has 799 ls2 heads, forged internals, air delete, egr delete, post cat delete, stand alone harness, 62# injectors, and a comp blower cam with an sts turbo kit running 8 lbs of boost.
I have seen the motor in a different car run great. After the swap I have had nothing but problems with it.
So anyways I'm getting a lean code but my afr is showing rich. It's around 10.5 to 11 without the turbo hooked up. If I hook the turbo up it won't even idle.
Car has been tuned for all the mentions above but wont run like ive seen it do before. Things I have checked or done are vacuum leaks, exhaust leaks, new o2s, spark plugs new maf, 2 bar map, and fuel pressure. I just dont get why it's showing a code for one bank. I've also checked the ltfts for that bank which stay steafy at 25% and the volts for the o2 are 0 to 0.03.
The motor has 799 ls2 heads, forged internals, air delete, egr delete, post cat delete, stand alone harness, 62# injectors, and a comp blower cam with an sts turbo kit running 8 lbs of boost.
I have seen the motor in a different car run great. After the swap I have had nothing but problems with it.
So anyways I'm getting a lean code but my afr is showing rich. It's around 10.5 to 11 without the turbo hooked up. If I hook the turbo up it won't even idle.
Car has been tuned for all the mentions above but wont run like ive seen it do before. Things I have checked or done are vacuum leaks, exhaust leaks, new o2s, spark plugs new maf, 2 bar map, and fuel pressure. I just dont get why it's showing a code for one bank. I've also checked the ltfts for that bank which stay steafy at 25% and the volts for the o2 are 0 to 0.03.
Last edited by 99turbols; May 18, 2016 at 09:41 AM.
had a similar problem with my 414 oddly same bank and a v6 swap car as well, but that had nothing to do with it.
Traced mine to the ECM itself, it was just not interpreting the signal from the o2 at all and keep ramping the injector pulse for that bank to compensate.....only problem was the o2 always read lean.
I believed the ecm pin for that o2 was burn out, so Im currently in the process of swapping to a 99+ ecm and I have to repin my harness cause its a 98 car.
not saying yours is your ECM but its a path to look into. Start looking into as much of the wiring as possible for that O2 looking for stripped wire for it to dump the signal. that sort of thing.
course this is all assuming you're monitering AFR with a wideband thats not feeding into the ecm.
But if im reading your post right it sounds like your bank 2 is registering lean, but your wideband suggests otherwise right?
Traced mine to the ECM itself, it was just not interpreting the signal from the o2 at all and keep ramping the injector pulse for that bank to compensate.....only problem was the o2 always read lean.
I believed the ecm pin for that o2 was burn out, so Im currently in the process of swapping to a 99+ ecm and I have to repin my harness cause its a 98 car.
not saying yours is your ECM but its a path to look into. Start looking into as much of the wiring as possible for that O2 looking for stripped wire for it to dump the signal. that sort of thing.
course this is all assuming you're monitering AFR with a wideband thats not feeding into the ecm.
But if im reading your post right it sounds like your bank 2 is registering lean, but your wideband suggests otherwise right?
Thread Starter
Teching In
Joined: May 2016
Posts: 4
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So i got around to swapping the computer and it did the same thing. My wiring for the o2 sensors are in the correct spot unless the guy who did the standalone swapped the wires by accident. I tried unhooking the o2 plugs and it seemed to almost run better but there was no way to tell what my ltfts were.
