What causes a diesel engine sound @ low speed ? on 2008 Lexus LS460

Just bough the car 2 wks ago assuming the recall for the valve springs repair done recently is the cause! not totally sure.

by in Honolulu, HI on August 20, 2012
2 answers 8 comments
ANSWER by on August 21, 2012
What trans mode auto. or manual?
COMMENT by on August 21, 2012
The transmission is in the auto mode (D). The sound is intermittent from neutral to drive.
COMMENT by on August 21, 2012
Has sound been in engine since you have owned it?
COMMENT by on August 21, 2012
Yes, I started to hear the sound after a few days later after I purchased the car. I first taught it to be poor gas octane quality but later drove the car up hills and the sound of diesel wasn't heard. Seems to me only when the car is at low RMP when the sound is heard.
ANSWER by on August 21, 2012
seek diag a est this needs to be looked at for proper diag.wow really wetry a lexus suv stk come on man
COMMENT by on August 21, 2012
Bet you can buy one,really.
COMMENT by on August 21, 2012
maybe where u live but in cali its all about style.just sayin
COMMENT by on August 21, 2012
This is more car than suv,but eithet way the shiftable auto covers both trans. Reason for question is maybe a lower gear might help with the orig. problem.
COMMENT by on August 21, 2012
as i stated it needs to be looked at to determine for sure
COMMENT by on August 21, 2012
You know i wish sometimes we could do just that,look at the autos i,ll bet it would be a shock to actually see what is really going on.