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Q: 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.
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seek diag a est this needs to be looked at for proper really wetry a lexus suv stk come on man
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.
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.
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.
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