Originally Posted by
AveoChick
I finally took to a "real" mechanic, but they were stumped. I do all of my own work usually. I maintain my cars like gold.
2010 Chevy Aveo 5 LT 124, 896 Miles
RECAP: Back on June 3rd car was stalling out at stop, and also happened to be running lean. After the stalling occurred, difficulty with acceleration was noted, jerking, and sometimes it felt like I would push the pedal and nothing would happen.
CEL codes ALL O2 sensor related.
During my saga I have replaced :
Camshaft/Crank shaft pos sensors
Throttle Body (Which also houses Air intake Control Valve within it)
New Intake hoses
MAF sensor
Spark plugs (Gapped Correctly)/Spark plug coil pack for good measure
VALVE cover gasket AND valve cover( PCV) valve integrated.
Super duper Fuel injector service
Upstream and Downstream O2 sensor with OEM sensors.
NO MORE STALLING, YAY!!
STILL RUNNING LEAN and no one can tell me why.
I had a smoke test performed, smoke came out a teeny tiny bit around the MAF plug in, so I sealed it up. No other apparent leak.
Current CEL codes.
P0137
P2270
P0053
Now remember, I have OEM brand new O2 sensors from just 2 months ago.
Why am I still running lean?
Fuel pressure is solid as a rock. O2 sensors are good voltage per computer.
Could this be an EVAP issue even though smoke test didn't show any leak?
My fuel filter is integrated into pump, should I replace the whole thing?
I would appreciate the insight.