Grinding noise while coasting.
I've had this problem for a while, and recently did a bit of work on the car and it still persists. While under load there is almost no grinding noise to be heard, but the moment that I release the gas pedal is when the grinding comes back. The noise doesn't appear to change in either pitch or frequency in response to RPM or vehicle speed nor is it effected by turning. It comes from the front left, but I have ruled out the wheel bearing as it was replaced last summer and the noise was just the same before and after. The half-shaft was also replaced last spring as well, and the noise is just the same as before and after. If I shift the car into neutral, then the noise almost goes away – maybe 90% goes away.
Is it possible for the brake caliper bracket to be worn or distorted to cause this? How about the rotor? Wouldn't one eat away at the other to the point of mitigating the noise or showing considerable wear? Neither seem evident.
Could a worn motor mount cause something like this? The front mount had a black rubber insert which felt a little soft, though still decent. It was replaced with a red silicon insert this past week, and it had no apparent change. The rear motor mount was torn up and soft, and as quick/temporary fix I placed sized metal rods into the holes to firm it up. It's much more firm now (semi-solid), I can no longer feel the engine rock back and forth as I did before. The one thing that I did notice odd about these motor mounts is that the through hole for the bolt was MUCH larger than the bolt size it self, so it seems as if there is a bit of room for slop. Is this normal, or should there be a shim of sorts in there? I've pulled many motors and transaxles and this is my first time seeing such a design. Is it possible for the tensioner (?) on the front mount to some-how manifest this? Considering that the mount has a nice silicon insert to stiffen it up, I wonder if it's okay to simply remove it.
I lifted the car, set it on stands and turned it over. I lightly gave it some gas to increase the rpm and wheel speed, and naturally, the noise didn't manifest. Perhaps it needs the full load (weight?) of the car on the problem in order to manifest it.
Could worn rubber in a control arm be part of this? The control arms were both replaced four years ago and the suspension is quite stiff, so I'm hesitant to consider that a first option.
Any thoughts, suggestions or especially experience on this would be huge.
(2000 C-SVT, 160K Miles, 5-speed).
I've had this problem for a while, and recently did a bit of work on the car and it still persists. While under load there is almost no grinding noise to be heard, but the moment that I release the gas pedal is when the grinding comes back. The noise doesn't appear to change in either pitch or frequency in response to RPM or vehicle speed nor is it effected by turning. It comes from the front left, but I have ruled out the wheel bearing as it was replaced last summer and the noise was just the same before and after. The half-shaft was also replaced last spring as well, and the noise is just the same as before and after. If I shift the car into neutral, then the noise almost goes away – maybe 90% goes away.
Is it possible for the brake caliper bracket to be worn or distorted to cause this? How about the rotor? Wouldn't one eat away at the other to the point of mitigating the noise or showing considerable wear? Neither seem evident.
Could a worn motor mount cause something like this? The front mount had a black rubber insert which felt a little soft, though still decent. It was replaced with a red silicon insert this past week, and it had no apparent change. The rear motor mount was torn up and soft, and as quick/temporary fix I placed sized metal rods into the holes to firm it up. It's much more firm now (semi-solid), I can no longer feel the engine rock back and forth as I did before. The one thing that I did notice odd about these motor mounts is that the through hole for the bolt was MUCH larger than the bolt size it self, so it seems as if there is a bit of room for slop. Is this normal, or should there be a shim of sorts in there? I've pulled many motors and transaxles and this is my first time seeing such a design. Is it possible for the tensioner (?) on the front mount to some-how manifest this? Considering that the mount has a nice silicon insert to stiffen it up, I wonder if it's okay to simply remove it.
I lifted the car, set it on stands and turned it over. I lightly gave it some gas to increase the rpm and wheel speed, and naturally, the noise didn't manifest. Perhaps it needs the full load (weight?) of the car on the problem in order to manifest it.
Could worn rubber in a control arm be part of this? The control arms were both replaced four years ago and the suspension is quite stiff, so I'm hesitant to consider that a first option.
Any thoughts, suggestions or especially experience on this would be huge.
(2000 C-SVT, 160K Miles, 5-speed).
