Gas pedal vibration? Need help/solution
 

There is excessive acceleration pedal vibration above speeds of 35km/h and it also makes very noticable humming rythmic sound at 93km/h. It usually occurs during cruising, not when heavy accelerating. The vibration is still present when shifted at neutral while cruising. Steering wheel does not vibrate or shake.

It happened after installing new tires. The shop already rebalanced the wheels two times and problem still occuring. (I highly suspect the front two tires since it happened after installing those. Rears were installed first
and had no problems)

Wheel bearings and spacers are also checked with no issue/play. However the front right and rear right wheel is slightly bent (the shop said machine couldn't detect it, they only notice when spinning wheel while car is lifted)
But if the wheels were already "bent", I didn't feel this problem with my old tires?

I am just trying to find a solution as it has been pretty bothersome

I was thinking getting the front wheels road force balanced? But that's $100 going to waste if it doesn't fix issue.

Tires are BFG comp2 all seasons 225/40/18

Car has 97k km mileage, 2014 FRS

Thank you for reading. Any help would be appreciated

Any bent wheels should be at the rear to minimize vibration symptoms. That is if you're not going to fix the bent wheels.

Also, you may have a defective tire that is balanced but still wonky. This could be checked by rotating the tires. If the symptom changes or goes away that's an indication the problem is in the wheel/tire assembly.

If it were me, if the tread depths are all equal just throw the bent wheels to the rear, with the worst at right rear.

If the tread depths are different enough to be a concern have the shop move the tires around on the wheels so you can have correct tread depth where needed, and bent wheels at the back.

Do you have hubcentric rings?

I've had a vibrating pedal when I got the car from the dealership. It was only in the pedal and the faster I went, the more vibrations I got.

These guys installed MY wheels before I got the car from them and didn't want to put rings, saying it wasn't necessary. Which is true if you know how to install wheels properly, but they obviously didn't.

Two days later I installed hubcentric rings and the problem went away completly. It might not be your problem, but it's a simple thing to check before going further for other problems. If you already have rings, maybe one fell off during installation, without nobody noticing.

I also had two rings squeezed behind the same wheel on an other car years ago, with similar symptoms.

Hmmm.. I have 25mm wheel spacers all around bolt on hubcentric. Ran them for 2 years and have retorqued them. Wheels are TRD wheels