Hello everyone. I am attempting to identify what is causing this lean code on bank 2 of my 2012 Chevy Camaro 6.2 liter SS automatic transmission vehicle. I have chased this thing down many paths and have had it evaluated at two dealerships. So here goes. Initially I had a CAT code on bank two along with the P0174, which I believe was caused by the lean condition and overcompensation of adding fuel that ruined the cat. So I changed the cat and O2 sensors and the CAT code is gone.
That said in attempting to diagnose the lean condition I have changed the following and it hasn’t changed: new spark plugs, new wires, exhaust manifold gaskets, intake manifold gaskets, throttle body gaskets, valve cover gaskets and grommets, all the injectors on bank two, intake manifold (new), EVAP purge solenoid canister, all vacuum lines, MAF, MAP. The only gasket I have changed is the oil filler neck gasket, which is on bank 2, and ECM, all to no avail.
All that said in my pursuit to diagnose or have it diagnosed I have monitored the fuel trims and noticed it occurs while at operating temperature, and if you are slightly pressing the gas and maintaining cruising speed. If I drive the vehicle in a fashion where I accelerate fast and let off the pedal and coast and don’t maintain speed by feathering the gas it won’t go lean. You can see the lean condition occur at the first portion of pressing the accelerator and drop off as it passes the approximately 20% throttle position.
The strange thing is it only occurs on bank 2, I have had smoke tests done and no leaks were found. I did a compression test and they are all good. I was hopeful in reading a post on this site about a secondary air injection system that was found to be faulty due to a stuck solenoid on a Blazer, however, I cannot find that this vehicle (Camaro) has that on the car. Any suggestions? Oh, and you cannot notice any issues while driving the vehicle, it drives fine and the lean condition isn’t noticeable other than with a scan tool.
You must be logged in to reply to this topic.