Hi Guys,
Nowadays, most of the cars have EFI engines and we talk about tuning up the engine. Unlike carburator engines EFIs has little to maneuver because most of the engine parameters are controlled by the ECU. including engine RPM. ignition timiing, injector timing etc.
my question is, when we handover the car to agents/mechanic for an engine tune up, what do they actually look for and adjust apart from replacing/cleaning fuel system components (eg. change air/fuel filter, TH body clean, replace plugs etc)
Agents add value for engine tune up in addition to part replacement. what are actually changed in this tune up?
The underside of my car (vios) bonet, there is a manufacture's stiker saying
"plugs clearence :this much; valve clearence: this much; no further tune up needed"