I have '07 Vitz (facelift) version with 1kr-fe engine. After last tuning from Toyota Multan Motors, I have been facing few issues which I didn't when I have it done there last time (in August).
Things that were done:
1- Throttle body removed & cleaned.
2- MAF Sensor (or something similar) was removed & cleaned.
3- Air filter was removed & cleaned (New Installed in December)
4- Plugs were removed & cleaned (I have installed Iridium last August)
It worked fine for couple of days, pick & no knocking but suddenly its feeling heavy, taking a lot of power to accelerate & knocking is some what increased at lower speeds (when accelerator is pushed). The only that got changed after tuning was, I got it filled with Total Fuel (which I use on regular basis).
1- Very heavy, taking a lot of load to accelerate
2- Making a lot of sound as if I am asking a lot of power from it
3- Knocking a lot.
Another issue is electrical, sometimes, all electrical things in the car including headlights, original japanese player, internal lights gets restart (just a flicker). Sometimes, when I self the car, it goes dead, than I have to push battery a little & then it works :s Battery was tested and it was about 11.45v instead of 12 which should not be very much an issue.
These all issues started with in a week & I have no idea what to do, specially under powered car
BTW, engine oil was replaced in December too, used the last one, Shell Helix Ultra, Oil Filter was changed as well.