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2012 Impala 3.6 power loss
Try to keep this short...I don't post much, but have had quite a few Impalas. This is my first 3.6, I got it at 75K miles in March. It runs great, super fast and the car handles like it is new.
Have had to do typical stuff. Front tires, rear tires this summer, front and rear brakes, outer tie rods. So there is that, typical stuff that goes out.
At 93K I did a tune up to help my issue(DIDN'T WORK) ac delco spark plugs, belt, cleaned throttle body, flushed the power steering as it was dark as well, coolant flush,tranny flush. The car is at 95K now.
I did get some codes on the computer at about 90K they included: P0036, P0056, P0135, P0141, P0155, P0161. All heater o2 codes, I deleted them, and they did not return. The engine is really feeling like it is lacking power. I am also getting a pop sound when I accelerate sometimes. The engine runs okay if you really step on it.
I am assuming it is the Catalytic Converter but not 100% sure. My MPGS went down, and running seafoam/injector cleaner has not helped. The car seems to be hunting gears, and going up hills you can actually feel the lack of power hitting. It seems is there actually two converters, instead of a converter and a resonator like the older 00-11 models?
2011 Impala LT