I have just under 190k miles and there is a hum on acceleration/holding rpm cruising, as soon as I get off the throttle it goes away. It scales in volume with RPM, however if I put the car in neutral while rolling and rev it doesn’t sound.
I believe it to be 0% drivetrain related; I could be going 100 mph and I let off the gas it goes away.
#2005 4Runner 4.7 2wd hum under engine load
supple igloo
toxic sapphire
I have just under 190k miles and there is a hum on acceleration/holding rpm crui...
higher rpm means bigger vibrations from the engine
can cause basically anything loose to vibrate
maybe some rubbers holding the engine or other parts are worn out
i once had sounds and vibrations when accelerating and turned out it was a bad catalyzator with the filters inside broken into parts
the answer is typical
it could be anything except what it cant be
supple igloo
Most reasonable answer I’ve gotten ig
Hopefully others will give input
The sound has not affected drivability in any way
toxic sapphire
The sound has not affected drivability in any way
if it sounds a bit like the whining of reverse gear it could be worn our transmission parts
as always check all fluids including transmission
check if something is leaking and check all rubber bushings and mounts
@supple igloo did you try turning ac or heating off or on
could be some belt driven aggregates next to the engine
does it do it in all gears?
supple igloo
does it do it in all gears?
It does it in all gears driving forward haven’t tried reverse
I don’t think it’s the transmission. Shifts through all gears smooth and fluid is good color on level