I hear and feel a grinding noise when accelerating. What could it be?

Asked by Jul 13, 2014 at 02:16 PM about the 2013 Scion FR-S Base

Question type: Maintenance & Repair

I have a sicon FRS, and I hear a grinning
noise under the front end of the car. I also
feel the grinding vibrations through my gas
paddle. The only time I hear and feel the
grinding is when accelerating, there have
been a few times where I have heard it
when dropping gears when in trip tronic
mode. The grinding does not occur when
idling. The car takes off great! Gears switch
perfectly! The car preforms perfectly, in
other words the grinding is not affecting the
performance of the car at all. I have done a
few modifications to the car, to be specific I
have a cat back exhaust, uel cat delete
headers and a short ram cold air intake.

2 Answers

238,065

Grinding is not good. Do not continue to drive it till you find the reason. Best to get under the car to see if something is hitting the driveshaft.

1 of 1 people found this helpful.
35

Most likely you exhaust rubbing on the crankshaft when accelerating. My Borla kit was extremely close. With the torque load on acceleration, I wouldn't be surprised if that was the case.

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