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The codes that came back were related to the Tech unplugging various bits with the ignition on, these were cleared and months later the car shows no faults. The car is 1997

...The TPS has been swapped with a known servicable unit, with no change. The throttle operates normally and if you rev the engine in 'N' or 'P' it is fine and will rev to 6000 RPM, no problem but if you punch the throttle the RPM will drop to 4000 RPM if the car if stationary or on the road, so...

Well I can get it past 4000 RPM by using ECT Power mode and just gently accelerating but that is quite fast even with O/D off. If you punch the throttle pedal the RPM will almost freeze and it's like the fuel has been cut right down. The car won't slow down but reaches a limit. I have made...

Thanks for the input fsuguy, I have'nt done this as the batt seems to be quite strong, however, first chance I get I'll have the condition checked. I have been gradually replacing the trans fluid recently, draining a couple of litres off and then putting new fluid in, I managed to get nearly...

Well, there is nothing wrong with that engine. It's been with Thor Racing at Coventry, who have gone well above the call of duty and comprehensively checked out the engine and systems. Just about everything has been checked and analysed, most of the list below re-checked and also: Ignitor...

Is it possible that a fault with the gearbox could be the issue here? One thing that has been raised is the kick-down function and it interfering with the way the engine is operating. The car does the same whether it is in 'D' 'P' or 'N'. I can't see it myself but would be interested in any...

...Well its with a 1UZ-FE specialist now, so far they have dsicovered a host of fault codes, most seem to have been related to stuff previous techs have been touching, these have all been cleared but one required the fitting of another O2 sensor. This hasn't made any difference. Should know more...

I'm pretty sure it has a vicous fan (have done a bit of checking).

The first Garage did check this but I think it may have to be re-visited... Yes, it will kick down into a lower gear then just sit there at 4000, it you take your foot off the throttle, it will change up...

I'm not sure, the fuel filter at the rear has been changed but it goes really well on the motorway and I'm pretty sure that at that speed even at 3000 RPM it would be sucking more fuel through than 4000 RPM at idle.

Regarding the speed, it doesn't matter. It has a factory immobiliser and I'll check about the hydrualic or viscous fan (How can I tell BTW) Thanks guys.

Re the MAF Sensor I unpugged it: Check engine light is on, engine runs rough and won't rev up much

Hi sideshow, thanks for the advice. The following things have been done: Exhaust & Catalytic Converters checked Valve timing checked EGR valve cleaned & checked Throttle Body & Plenum Chamber cleaned Distributor Caps, Rotor Arms & HT Leads replaced (Old Spark plugs were not suspect...

Hi, I have a similar problem with my LS 400. The whole saga is at http://www.lexusownersclub.co.uk/forum/index.php?showtopic=73960&st=0 It's well worth a read and I am very open to suggestions. It looks to be an issue with the MAF sensor or readings from it.