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Hello, I have a problem with my 2011 Optra, it randomly stalls and runs rough then gets back running ok after some time, details:
Car Specs:
Engine: E-tech 1.6L 4 Cylinder Naturally Aspirated
Transmission: 4 Speed automatic gearbox
Drive: front wheel drive
Year: 2011
Milage: 165,000Km
Issue description:
The car runs fine and drives ok for most of the time, but about 2 times per day, this happens:
I am driving down the road and the acceleration is down and the engine is vibrating and feels like it is misfiring, I pull over and put it in neutral, it idles roughly and then after 10-20 seconds it stalls, I restart it and it stalls instantly, if I start it and give it gas it revs up and bounces around even with the gas pedal not moving, still feels like misfiring and runs really rough and vibrates, if I let the gas it stalls instantly. Give it around 15-20 mins with random tries in between and it sorts itself out, still bouncing around slightly on idle but pretty stable otherwise.
Repairs done already:
Cleaned air filter
Replaced fuel pump core (Chinese replacement because GM is expensive and I can’t throw this kind of money at it when I don’t know if it isn’t the problem)
Replaced spark plugs
Replaced air coil or something similar ( a small black air valve kinda thing, I don’t exactly remember)
Replaced spark plug wires
Replaced exhaust sensor ( the one in the front of the engine in the exhaust manifold) (Chinese replacement because the GM one was way too expensive)
Replaced cabin air filter (unrelated but the AC was too noisy and the filter was literally a dust party)
Replaced throttle body which caused a very bad misfires so I re-installed the old exhaust sensor and it worked
Replaced battery because it died randomly without any lights left on or anything
Extra details:
Went to 4 or 5 mechanics with each a different OBD2 device and all didn’t find any trouble codes, and no dash lights either
The replaced stuff was by a mechanic and not me
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