GS Sport

Hi, I have a UK GS300 MkI fitted with the Sport Option 8.5" Front and 10" Rears. I've tried to establish the recommend pressure for these and it's not easy. Lexus, if you can get them to commit to an answer just go with that shown on the door sticker for the standard 16" option which is 35 psi front and 36 psi rear. Although a lot of UK drivers report centre wear on the rears which would indicates 36 is too high. Other UK drivers seems to do OK with 32 psi all round. I think it's a case of take your pick and monitor the tyre wear. If you do get a definative answer please let me know. By-the-way the Supra is amazing , always wanted one but with a family the GS was a compromise.

Just as an update I thought this may help if anyone else has suffered this problem. The answer lay in the geometry and worn rear tyres. I got a full geometry check with tony (wheels In-motion) and he found a number of areas which were quite a bit out. Most of the noise disappeared once the geometry was right and the remaining noise disappeared once the rear tyres were replaced, There was severe wear on the inner edges of both rear tyres. Hope this helps anyone else who may be getting the droning from the rear. GS Sport.

Its sounds to me like this is differential related. Are there any abnormal vibrations while driving? Have you tried putting the car in neutral while going around 30mph? Does the noise change? I was on a test drive with a tech and was listening for a noise so he sped the car up put it in neutral and turned the car off to track down the problem. You might want to try this. I’ve heard a couple bad differentials and this is what it sounds like. A droan coming from the diff. With your symptoms you could us a process of elimination and everything points towards the differential. Thanks for the response. No vibrations while driving. I've tried putting the car into neutral at 30mph and there's no change in the sound - if it were a diff problem would the sound lessen or dissapear? A couple of people have suggested a wheel bearing and have said that even with the car jacked up there may not be any noticable movement in the wheel, don't know if this is true? Thanks again for the response - i'll post when I finally track it down. Ian.

Hi LOC USA, A call for help from the UK. I have a '97 GS 300 MkI and it has developed a drone from the backend. The noise doesn't seem to increase on cornering so I'm thinking not a wheel bearing, although sometimes it does seem to increase on roads with a steep camber. Braking makes no difference either, the noise remains under braking. It also doesn't change under accelleration. The noise is at it's loudest around 30 MPH. I've checked the level of oil in the differential and this is fine. I did have the rear wheels tracked due to tyre wear on the inner rim. I'm thinking about getting a full geometry check at Lexus but not really sure if this would cause a noise like this droning. If it were geometry wouldn't the noise be simular at all speeds? The car is fitted with the 10.5 inch rears which I guess will cause road noise but this noise wasn't there from when I bought the car. Do the tyres produce more noise as the treads wear? Sorry so many questions but I'm at a loss with this. Any one with any suggestions would be greatly apprieciated as this noise is driving me nuts! Thanks in advance. Ian.

Thanks Guys. I knew about the lights having to be on but thanks anyway, it is real easy to miss the simple things. Thanks for the pdf files, should be a great help. I'll check it out as soon as I get chance. Thanks again both of you for your help :) GS Sport

Can anyone tell me the location of the relay for the headlight washer on a MkI GS300 Sport? Has anyone had a problem with the headlight washer not working, I've checked the pump on the battery and that works fine so I'm guessing it's a relay problem. I live in England and have tried the UK forum without out luck so I thought I'd try the US club. Any help would be apprieciated. Many Thanks.