You would need to figure out if you are dealing with a fuel problem or an ignition problem to proceed. Have you checked for vac leaks and know for a fact the engine has compression on all 4 cylinders ?
SOURCE: 2000 mitsubishi galant
If you have changed out the parts and still get the codes you probably need to have the ECM reset. The dealer can do that for you or a repair shop that has the scan tool.
SOURCE: O2 Sensor defect
MR988905 costs $300+
SNG O2 sensor is just below $100
they may claim being made with the same quality and both are tagged "direct fit" for easy installation.
its just my idea, good luck.
SOURCE: need to know placement of heated oxygen sensor
The O2 sensors are located in the exhaust piping.
One (bank 1) is on the engine side of the Catalytic convertor.
Second (bank 2) is on the other side (exhaust end).
There are manufacturers that make universal fits that will go in either location. Be sure to specify the rear sensor when you go to the parts store.
It will look like this....
It threads right into the exhaust pipe.
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SOURCE: My p/u 1988 mitsubishi 2.6L runs rough after replacing carb with
Have a qualified mechanic rebuild your original carburator and reinstall it with all the original vaccum hoses and controls functioning properly.
Someone smarter than you and I, designed this engine to function properly with the feedback carburator. Installing an aftermarket carb negates the entire emision control system and will not allow the engine to "Breathe" properly.
"KISS" (Keep it simple, Stupid)
SOURCE: I have a 1997 Mitsubishi Galant with rough idle
I am having the same issue on Mitsubishi Galant 02. Clattering on acceleration, herky jerky idle. Pulled a code multiple cylinder misfire. My mechanic's diagnosis is bad valve cover gasket causing oil to seap into the spark plugs and bad timing belt, which I have not replaced at 150k miles. I do however know my fuel injectors do need cleaning, he hasn't ruled that out either. Have you pulled any code on it? I have read on engine knock sensor going out on some of these also. Hope this helps some.
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