Faint detonation noise
Fo the last two years, I've been hearing the faint detonation sound when starting off. The sound is more pronounced when I'm driving besides another car, or a road divider, which reflect the sound back at me.
It's more pronounce on warm days, and mostly when starting off. It goes away when driving at steady speed, and usually is not there first thing in the morning.
I know the knock sensors are supposed to adjust for that, but I'm not sure if they're just slow to react, or if that is normal.
No CELs, no codes in memory, and the car starts and drives fine. I normally use regular fuel, but I tried a couple of tanks of the highest grade fuel available, and from different suppliers, but it made no difference.
I dont think that im supposed to hear anything, but Is it normal to hear some faint detonation?
Car is a 2001es300 with about 100,000 miles. Timing belt was done last year by Lexus dealer.
Last edited by PFB; 05-02-13 at 08:32 AM.