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nemo12

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My 99 cobra is making a really loud knocking sound idk why i tried doing a burn out and then the car started shaking really bad and now its knocking wtf! What could it be
 

blacksheep-1

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OK, I assume it does it at idle and is confined to the engine.....if it's a metallic "rap" it might be valvetrain related a deeper sound is bottom end.
 

nemo12

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idk how this happened it has low miles idk how this could happen with such low miles …. my 97 f150 has 250k and still strong! not cool
 

snakeraper11b

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Low oil, cold engine, many things can go wrong with an engine, regardless of mileage.
Also, what do you mean, you "tried" doing a burn out?
 

nemo12

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since I've owned the car I've never done a burn out so today i did it and then after it started spattering and i heard hard knocking sucks
 
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snakeraper11b

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since I've owned the car I've never done a burn out so today i did it and then after it started spattering and i heard hard knocking sucks

How exactly did you initiate the burnout? Clutch dump and brake stand? Spinning from a dig and pegging the revs off the limiter for a few seconds? Don't be embarrassed to answer, people will give you a hard time, but, we all do it from time to time.
 

71catruck

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Ya we need to know exactly what you did and how it makeing the noise. I knew someone that did a burn out in a 98 trans am and didn't turn off traction control. It was knocking when she drove but was just the clutch.
 

nemo12

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from a stop i reved the car and dumped the clutch … then it started to stall and started shaking really bad thats when the knocking started
 

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