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Tech501
Tech501, Auto Service Technician
Category: Car
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Experience:  38 years exp, ASE Mastertech with L1 Advanced Engine performance
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95 pontiac sunfire: clutch..car starts..rotors and break pads the day

Customer Question

I have a 95 pontiac sunfire the fluid for the clutch has been leaking ..I keep it full.. can't find the leak. can see fluid on the cardboard after I drive it ...Now when I'm driving if the car starts to slow down or sometimes when I excelerate whether I'm breaking or not there is a loud thumping under my feet ...it comes and goes, sometimes it happens worse than other times. My cousin just changed the rotors and break pads the day before it started happening. He's a mechanic who sold me the car a few weeks ago.
Submitted: 11 years ago.
Category: Car
Expert:  Tech501 replied 11 years ago.
 If it started after your cousin worked on it, that's very suspicous. Usually a vibration under acceleration comes from a problem in the inner C/V joint. He would have had no reason to remove the axle though. If for any reason he had that axle or the ball joint disconnected, he may have messed up the inner joint. It could have happened by itself also, it's just a big coincidence he was working on it before it started.
Customer: replied 11 years ago.
Reply to Tech501's Post: the car does not vibrate at all it's just a loud thumping noise under the car . could it be in the transmission? Also when he took my wheels off (they are chrome wheels with rocketLUGs with 8 points inside). he didn't have the key so he stripped the lugnuts getting them off. Maybe he couldn't get the lug nuts tight enough. could that make a thumping noise without the car shaking? I bought a new sety of lug nuts with a key but he has to take the old ones off again.Thanks
Expert:  Tech501 replied 11 years ago.
 There's a dozen things he could have messed up. You or another mechanic are going to have to get under there and inspect things. Something in the brakes could be hitting the inside of the wheels too.

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