05-04-2018, 04:15 PM
Join Date: Jul 2017
Location: Tehachapi California
OK, so an automatic transmission.
That rules out the clutch/pressure plate and leaves the flexplate as a possible cause.
Your regular mechanic sending you to see the transmission specialist seems to exclude anything being
loose in the engine compartment and points it to being non-engine related.
If a shift solenoid was going out, it most likely would not bring a light, nor would a
cracked flexplate or loose torque converter.
It seems as if when you are giving it gas and the noise goes away, it is the
centripetal force acting to straighten the plate, which quiets the sound.
I do not perceive it to be related to the shifting or nonshifting between the gears, but this is only my opinion.
Your mechanic could possibly remove an inspection plate and look inside to check whether or not that is your problem.
I'm here in the USA.
1994 Geo Tracker 1.6L 8V TBI, 3-spd auto 4WD 152K timing belt/wp power windows Camo seat covers carpet Dashcam & backup cam
1999 Chevy Tracker removable hardtop 1.6L 16 valve 5-speed 4WD 104K timing belt/wp aluminum radiator electric fan Bartact seat covers Vixen airhorn onboard compressor Dashcam rear locker winch
2002 Grand Vitara 2.5L 4WD 123K Valves lifters rings/bearings timing chain gears tensioners WP coils ECU
1991 GMC K2500 4WD 454 Xcab
1997 Trans Am LT1 auto