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Knocking sound when driving car

245 views 18 replies 13 participants last post by  Spieren 
#1 · (Edited by Moderator)
I left my car stood on the road for 8 weeks and didn't drive it. I changed the battery today, and then took a drive in it. There is a knocking sound that seems to get faster and louder the faster you go as you drive it. It doesn't happen when you leave the car stopped and just rev the engine. I asked a dude to listen for the sound as I drove past him and it seemed to be just a slight knock when he heard it. What could it be? We both looked and there didn't appear to have anything hanging down touching the back wheels. It brakes just fine and drives just fine apart from the knocking. The wheels don't seem loose, and the exhaust seems fine. I'm stumped as to what it could be to be honest. Any ideas? I could have missed something, it's hard to see under the car. It's a pretty old car by the way.
 
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