Lately at randoms times when starting the car, as soon as it goes turns on, theres a rattling noise coming from the engine .. everything works fine but i find it kinda weird..
anyone have some reasoning for this ?

 

Could be the cold start up knock......There is a TSIB for it

 

how is this taken care of ? im at 60K miles im sure guarantee wont cover

 

There is a TSIB for it. I don't recall what the powertrain warranty is, but i think you're still in it, so it should be free to get fixed. Even if you're not, it's a decently documented problem so you may be able to convince a good willing dealer to fix it.

That said, I believe it has something to do with the variable valve timing gear at startup. I've been told that it is not going to ruin the engine to leave it as is (hence it's a service bulletin rather than a recall, or so I was told). My cynical belief is that it wasn't a recall because it's not a safety issue and that anytime a part of the engine is grinding, it's not a good thing.

My dealer did the fix but I still intermittently hear the sound. The big trouble in all of this is the repeatability of the problem. As I'm sure you've noticed, it's intermittent and the dealers can't/won't submit an expensive claim to lexus (I think it's about 8-9 hours worth of labor) just because you heard it. They have to hear it.

Anyway, it may all be minor, but I must say, I was pretty upset about my brand new (when I had it done) or even 4 year old car (now) needing to have the engine pulled apart. I may be a bit superstitious but I am a firm believer that once you open anything from the factory and it's tight tolerances, it's never the same

Oh yeah, there's a big thread on this issue. Good luck.

 

Nice! I actually just noticed the same thing this morning. I'm going ot have to look into. I've had my car for about a month. Maybe I can plan all of this with the oil change in a couple of months.

 

Powertrain is good for 70k, and the TSIB is good for 72 months from the date of release, thats what my local Lexus dealer told me.

 

Alright man thanx.. that helps a lot. Lets see how my luck runs at the dealer. lol

 

Hi,

Could someone please post the link to the exact TSB. Could not find the exact one.
My dealer was not helpful today.

Thanks

 

is this the one u looking for?

http://www.lexustsb.com/questions/20...t+Cold+Startup

 

Thanks, however mine is an 09 IS 250. Will it work since it says 06-07 IS 350.

 

hi,

is your problem same as mine. i have this weird knocking sound every time i start up my car now. do not know where it came from. my car is IS250 2006. does anyone have any idea what is the problem.

http://www.youtube.com/watch?v=DfLPTCC_Ytg

tq

 

MIne is somewhat different. The dealer said it happens when the engine is cold and is very normal. It has something to do with the injection but am not satisfied with his answer.

 

mines does the clicking noise as well and the dealer told me the same answer as "rashivivek" t happens when the engine is cold and is very normal.

 

I have this same problem, and I already had a timing belt and a pump changed because it got worse, then it went away for a couple days and now it's back again. And my car is a 2007 6 speed.

 

yeah same story here. the dealer just said its normal for the engine to make that small noise, although on my case the knocking noise is very short right after the start up, and last about half a second.. is annoying, im gonna see if i can get something going with another dealer..lol