How to solve a problem in mitsubishi 4g93 GDI, the auto gear is not changing but the revs is okay it moving with one gear always..

NO YEAR TOLD
NO VIN TOLD
NO COUNTRY TOLD (EFFECTS EFI THIS)
throttle pedal (engine ) is weak or transmission slip. tests prove this.
there are 6 variants of this engine.
no transmission told ,make,model. not even STICK or AUTO tranny

The 4G93 is a 1.8 L (1,834 cc) engine available in both SOHC and DOHC versions. Turbocharged variants are also produced. In mid 1996 Mitsubishi released a gasoline direct injection (GDI) version of the 4G93. This GDI model saw a production of over a million units though it was a heavy polluter therefore only sold in the Japanese market. A partially cleaned up version (with less power) was later sold in Europe, and was among the first of the modern GDI engines. It brought good fuel economy and, if well serviced, long engine life.

Replace the air filter and IAC idler air control valve.

probably not a lot except for the turbo sensor or actuator wires
which may be there already just not connected to anything
if you can get a schematics of the wiring and see if there is as it may say applicable to--- and list the models

If the transmission is not actually slipping, the most likely culprit is the "governor" in the transmission. Fairly easy repair for a transmission shop.

the transmission kickdown cable could be the issue if it has one. or the transmission needs fluid. or is damaged has mechanic look at it.

hi

i would check the transmission oil is topped up first and not below the operating level

second if thats ok it sounds like the auto box is on the way out

you would need to take it to a transmission place for an assessment

cheers

most of cars use rods, linkage, to comunicate gear shifter and transmission and this linkage have loints witch are robber and these robber joints some times wear out and you need to replace them. Open the shifter cover and check if therr is any damage there and inside the hood find the transmission shifter on the transmission and follow the linkage and inspected too, if these things are ok the check the transmission itself

sounds like the fuel pump in the tank ? without seeing the vehicle myself i cannot tell you anymore .

Well if sounds like possible a vacuum modulator or if the fluid and filter haven't been changed in say 40,000 miles or more I would recommend changing the tranny fluid and tranny filter.

the correct transmission fluid is ATF+4, any other trans fluid will spoil the transmission.
i use platinum spark plugs in my engine, works great.