Hello,

1 week ago i changed my spark plugs at car repair shop so since then my fuel average started to increase it now on 7.7/100km its very high it used to be 6 not more draining a lot of fuel

my mate has also a lexus 250hs lexus changed the same day with me also his fuel not as normal the car taking a lot since we change the spark plugs.

we dont know what's the problem

can anybody help us?

thank you

 

What make of plugs did you install? If they're not Denso, take them out. This is a proven issue on the LS forums. For whatever reason, only Denso's (Toyota) work properly, Some have replaced with NGK, Bosch, etc and have had disasterous results.

 

i went to lexus/toyota dealer asked for spark plugs

 

So, are you saying that Toyota/Lexus replaced them for you? Did you see the plugs they installed? If you did see them, they would have been in red boxes. If the dealer did the work, you need to go see them and express your concerns. Is the car running ell otherwise? No idle issues or fuel smells?

 

i just took the parts from them but did not change.....because in my city we have only parts place for Lexus/Toyota

i changed them in a car repair shop

i feel the car is better more power no noise sound perfect everything is better

but only the fuel is running out fast not like always

note : i changed the oil recently aswell from 10w-40 to 0w-20

 

If anything, the 0W20 would improve mileage. That's the correct oil for our cars. So, that leaves the plugs. No clue what has happened there since the car is otherwise operating as it should. Perhaps you ned to just wait and see if it improves when the computer adjusts to the new plugs and driving style.