This is a common problem with all the the cars fitted Toyota VVT system, and is definitely not an America only problem. I have a GS450H that has the same problem. It is caused by the oil draining out of the cam phasers, and a locking pin that should lock the movement until the system has full oil pressure failing to engage. Lexus will not do anything about it in the UK on the hybrid versions. However vehicles that use the same engine, but are not hybrid have the cam phasers changed free of charge even outside of the guarantee.
The problem is the "rattle" has been known to undo the cam gear holding bolts destroying the engines, but Toyota says this only happens with engines fitted with normal 12 volt starter motors, and not with hybrids where the engine is spun quickly with hybrid system to start it. I however know of two cases where the bolts have come undone on the hybrid GS.
I have fitted a home brew pre lubrication system to my car to eliminate this problem by bringing the oil up to pressure before the engine starts. the details are available on the forum. The alternative is to have new cam phaser gears fitted at a cost of an arm, and a leg.
For a dealer to say they know nothing about this problem raises alarm bells. They do not appear to know anything about the cars they are servicing or are lying about the problem.
John.
Hello John. Could you please explain how did you install pre lub system to the car ? what was involved ? what parts did you use ?
Short rattle at cold engine startup.
in Lexus IS 300h / IS 250 / IS 200t Club
Posted
Hello John. Could you please explain how did you install pre lub system to the car ? what was involved ? what parts did you use ?