Oldun

There is a separate oil filter for the VVTI system which can clog and there deprive the cam adjustment system of oil

http://www.clublexus.com/forums/performance/401898-p1349-vvt-system-malfunction-bank-1b-blocked-oil-control-valve-filter.html

Very many thanks Steve. I will investigate further.

Hi Steve,

I am certain it is coming from the engine compartment. If I start with door open whilst in garage I have stuck recorder under car and recorded noise. It really sounds like a bearing rattle and seems to last until oil pressure builds.

Could you leave your car with your Lexus dealer overnight so that they could start car from cold and get a good listen to it. Much easier to diagnose that way than just listening to a recording.

Hello Steve,

Thanks for the reply. I am afraid the noise only occurs at irregular intervals so I cannot say when it will next happen. Perhaps I had better wait until it happens everytime I start!!

Any clues as to where you think the noise is coming from eg clutch transmission engine?

Hi Steve,

I am certain it is coming from the engine compartment. If I start with door open whilst in garage I have stuck recorder under car and recorded noise. It really sounds like a bearing rattle and seems to last until oil pressure builds.

I have just joined the forum and would like some advice if possible. I hope this is the way to use the forum!

My 2005 Lexus GS300 with 56,000 miles (genuine)has occasionally a loud rattle on starting from cold. This may happen two or three times in a week and then vanish for quite a while. I have recorded the noise but my Lexus garage could not offer an explanation. I read that a member found that the torque converter drive plate was the problem and wonder how this was found out.

Thanks,

Oldun

Hello Robin,

I have just joined the forum and posted a reply to a comment by 'William' re engine noise.

My 2005 Lexus GS300 has also a rattle when starting from cold although it only happens occasionally, perhaps for a day or two and then vanishes for quite a while. I recorded the noise but cannot identify it. Have you had any more luck with locating it?

thanks,

Oldun

It was NOT a noisy top end!!! Turned out it was the torque converter drive plate (flex plate). The noise got gradually worse and the source appeared to move rearwards.

The plate was replaced last week - new plate £170 plus labour £350 plus vat (not Lexus). There was a crack almost all the way round just outside the crank bolt holes. Still seems wrong that it should rattle like a top end or bottom end or piston but it did.

Hope this helps someone else to diagnose their rattle and knock.

Hello William,

I have just joined the forum and would like some advice if possible. I hope this is the way to use the forum!

My 2005 Lexus GS300 with 56,000 miles (genuine)has occasionally a loud rattle on starting from cold. This may happen for a few days and then vanish for quite a while. I have recorded the noise but my Lexus garage could not offer an explanation. I wonder how you found that the torque converter drive plate was the problem and any ideas where else to look in the forums.

Thanks,

Oldun