Last post on Feb 22, 2012 at 7:17 AM
You are in the Lexus GS 450h
What is this discussion about?
Lexus GS 450h, Engine, Hybrid Cars, Sedan
#5 of 9 Crunching noise in engine of GS450h at startup
Jun 04, 2011 (6:14 am)
Anyone out there that has a Lexus GS450h 2007 and 60000 miles that has experienced a crunching noise in the engine particulary when starting the car from cold the noise lasts for 30 seconds and then disapears sounds like a timing chain maybe?? can any help??
#6 of 9 Re: Crunching noise in engine of GS450h at startup [groary]
by PFFlyer@Edmunds HOST
Jun 04, 2011 (10:41 am)
A crunching noise? That feels like it can't be good, even though it goes away. I'm no expert, but the timing chain doesn't seem like it would be a culprit to me (remember, no expert) as those chains would have very little play in them right? If a chain was making some kind of noise, I would imagine that it would keep making it.
Now to be like Car Talk ... could you be more descriptive of the noise. Is it a metallic crunching?
#7 of 9 Re: Crunching noise in engine of GS450h at startup [pf_flyer]
Jun 05, 2011 (4:04 am)
the noise sounds like that the starter motor takes longer than usual to disengage when starting however i am told that the gs450h cars dont have a starter moter and that the car is started with the hybrid motor instead which is engaged continuosly so that rulles that out . the garage has told me that the noise is only presant until the oil get around the engine ???? why was this noise only just appeared?? however there is a small device which expands with oil pressure that puts pressure on the wear strips of the timming chail to stop it from rattling I wonder if this is the reason why is noisey at startup????? if there is any other gs450h users out there with the same problem please let me know???
#8 of 9 Re: Crunching noise in engine of GS450h at startup [groary]
Jul 14, 2011 (4:09 pm)
I have a 2007 GS 350 and I'm getting the same noise on start up randomly about once a week. Lexus tells me they can't do anything unless they can duplicate the problem. My guess is it's the timing chain. It's frustrating and not what one would expect from a $50,000+ car.
#9 of 9 Re: Crunching noise in engine of GS450h at startup [sammysm]
Feb 22, 2012 (7:17 am)
To all i am told by lexus that its one of the petrol pumps that makes that noise on start up