Noise when accelerating

Tiny
BEAR WESENBERG
  • MEMBER
  • 2008 FORD FOCUS
  • 2.0L
  • 4 CYL
  • 2WD
  • MANUAL
  • 134,675 MILES
My car is making horrible rattling, scrubbing or grinding noises when accelerating. I have replaced clutch both axles and transmission mounts and still have the problem and it actually has gotten louder after I replaced those parts. Can anyone please help me out so I do not waist more money replacing parts that does not fix my problem? I want to believe it is my transmission, but now positive. Please can someone help me out?
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Tuesday, April 18th, 2017 AT 6:27 AM

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Tiny
BEAR WESENBERG
  • MEMBER
When car is in neutral I can rev the engine up and it makes no noise. I can put front end on jack stands and let off clutch to turn tires and the noise is gone. As soon as I drop it back on ground and drive it the noise is there. So I am a bit clueless on what is going on here.
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Tuesday, April 18th, 2017 AT 6:31 AM
Tiny
STEVE W.
  • EXPERT
I will assume you checked the brakes and wheel bearings for problems, both front and rear? Wheel bearings can be very noisy but still have no extra play in them. Also, check for a stone or metal between the rotors and the backing plates or calipers.
Even a small one can generate enough noise that it sounds like a grinder up front.
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Tuesday, April 18th, 2017 AT 7:11 AM
Tiny
BEAR WESENBERG
  • MEMBER
No, I have not checked bearings but brakes rotors and calipers are okay. I have noticed my rpm getting higher then normally and car is barley accelerating. It kind of reminds me of gears hitting or missing some teeth. I can be in second gear around fifteen mph and when I start going my rpm have almost cleared 6000 rpm's and I have barley made it over twenty two mph.
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Tuesday, April 18th, 2017 AT 7:17 AM
Tiny
STEVE W.
  • EXPERT
I would start at the bearings, It might still be something in the transmision but replacing a bad wheel bearing is easier and less money. A trick on the bearings, jack up/lift the front end so the wheels are off the ground, grab the spring and then spin the tire. You should be able to feel a bad bearing, even is there is no play if you try rocking the tire.

Check fronts and rears, you would be shocked how sounds travel in a chassis.

Another thing you could try, put the front in the air on stands, put the car in gear and step on the brakes while the tires are spinning, that would load the trans-axle and might help point out if the problem is internal.
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Tuesday, April 18th, 2017 AT 9:51 AM

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