asking for a friend who has an ES 250 (European union) and I am not familiar with this engine
the car has 115k kilometers and it started to exhibit loss of power.
this is occuring at all gears.
car has newer plugs, new oil/filter(mobil), new air filter, cleaned throttle boddy 1 year ago.
what should he check?
no codes

 

Hard to determine what the problem is without any codes. But if you go back to diagnostics 101 start with the idle quality. Is it smooth and at the correct rpm. Is the water temp where it should be. Is the exhaust pulse steady and with pressure (maybe cats problem). Is the air filter and fuel filter new. Check the front plugs and maybe even take a compression test. What does he mean by loss of power. How does he measure this.

 

thanks idle is fine and correct, water temp is fine, new air filter, plugs are denso iridium less than 15k miles
would a cat problem not set a code?
someone told him it may be a vvt timing issue but would that not set a code?

 

anyone have some more input>