hi, i have a 1996 ls400.
i have only had it a few weeks, and it was bang on at first, but now, when its been sat overnight, it doesnt want to start. it takes some very lengthy cranking and eventually 1 cylinder will bite, and i have to hold it at full throttle untill she finally sputters into life cylinder by cylinder. then, as it settles down, it revs smooth on gradual throttle, but if you boot it, it misfires/almost cuts out.
all these problems disappear once she has gotten only slightly warm, and at this point, it starts perfectly and doesnt miss a beat.
i have fitted a new coolant temp sensor which didnt help, then rang my local lexus garage, described the above, and the guy i spoke to over the phone said, with some degree of confidence, that it would be down to cracked egr pipes. great, i thought, so today i took off the egr pipes, and they were as good as new, no cracks at all. i have cracked off the bolt at the end of the injector rail when it was stone cold, flicked the key and it sprayed fuel all over the engine, so there is no issue with lack of fuel. it also has a good spark. i removed the rear seat to access the fuel tank, and there was no crap floating around the place, and the fuel smelt fine.
im hoping someone else has had the same problem, as my forum searches dont bring anything up, and its ruining the honeymoon period of owning this, in every other way, superb car.
thanks.