Hi Asghar, sure I’ll guide you the best that I could do without physically inspection. Keep in mind average and performance factors also includes out of the engine box. Example wheal alignment , recommended tyre pressures, make sure all of wheels are free to rotate in neutral position,
Engine matters :
Note that even you have no engine check light isn’t mean every thing is perfect. communication in between ecu with sensors input output most important factor for performance, engine check light mostly trigger in worst condition if worst case ecu sensors communicate. In between value if not properly communicating results is poor performance Here I’m going to tip you should have make sure before get into deep tuning performance.
1- make sure ecu harness and it’s terminal is out of corrosion as well as at sensors harness.
2- most common issue is throttle body o ring seal to air filter air intake issue causes maf sensor wrong signal to ecu
3- check PCV valve , mostly Mechenic not consider it
4- make sure temperature, maf, o2 , throttle body and all senators output range is current . You can test almost all sensors with multiple, performance services cans use carb cleaner if still out of range , go for replacement
5- injectors should inspect for proper fuel pump pressure and nozzles ,
6- IAC sensor is important should service and sure working fine , remember that is your PCV value is faulty IAC becomes deposit very quickly and malfunctioning.
I think for mean time it’s enough at this level , I’m holding next level trouble shooting and performance due because it’s depend on physical inspection , good luck ,
