just got back from Lexus Cardiff, superb customer service, was greeted by the very pretty receptionist, the mechanic was superb, couldnt find any faults so didnt charge me, and they washed it too, so my car must be behaving normally then.
My MK4 used to do around 18 in town so you're not far out. The LS430 does about the same, and I can manage 32 at best. I suppose it's not a bad thing to have a proper Lexus diagnostic check once in a while. Did they give you a price?
60 pounds to do the diagnostic, not bad really, as i have tried to get it done at another garage, but they couldnt get into the ecu, if i do a ecu reset it goes upto 18.5 but soon drops back to 15-16.
I took my mk 4 to a garage who said they specialise in lexus amongst other cars as i think i have a fuel consumption issue, he tried 2 diagnostic machines, both wouldnt connect, he didn't charge me. so it looks like i will have to go to the main dealer.
i get around 16-17 mpg round town and about 27 mpg on a longish run, things like suspension arms may need attention but hopefully they have been done on your car allen
all an induction kit will do is make more noise you wont get any more power, you cant remap these ecu's, the only way you get proper power is by turbo/supercharging
Thanks for the input guys, maybe i am expecting too much as lets face it its on original shocks that are 17yrs old so they are bound to be worn, i have 33 psi all round by the way, if i put more in the ride becomes dare i say it crashy. there is a lot more road noise than i was expecting but i have put that down to the fulda tyres around. The best riding vehicle i have been in is a range rover, a friend of mine had one, it was quite old on a 98 but the ride was incredibly smooth definitely a magic carpet ride.
I have been looking on the internet, alot and people keep going on about the ls400 having a magic carpet ride? hmmm i am not convinced mine has this, its a mk4 with 98k on the clock but i seem to think the earlier 400s have a smoother ride compared to the mk4, as pot holes and ridges can be felt through the car. I have been in bmws and they seems to take bumpy roads alot better than my 400.
in all honesty you are better off leaving it standard, as all you will end up doing is drawing warm air in from the engine bay, it may sound good, but you will reduce the engine power
I tested the sensor on the car, seems to be well within its tolerances, thats mostly round town though with a light foot, going to book it into the dealer, they want £107 to do and hours diagnostic.