Car noise: loud grinding/pinging. Louder when accelerating up to 40mph. Not as bad when idling/over 40mph

Hi, Please check you engine oil as a first start. A loud noise could indicate engine failure or engine auxiliary components failure. You can know if the sound is tapping or knocking or if the sound is rubbing or grinding sound due to rotation. At time you may have a drive train fault

Loud Noise Unknown Origin - Ask the GM Technician - GM-Trucks.com

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Jun 30, 2006 - 7 posts - ‎3 authors
I get a loud clunking, grinding noise while turning to the right only, and ... I moved the passenger side tire to the rear driver side just in case it ...

can bad wheel bearing/hub cause loud clunking noises?

www.jeepsunlimited.com/.../showthread.php?...loud-clunking-noises

Nov 12, 2009 - 14 posts - ‎6 authors
driving home, i noticed some metal clunking sounds coming from the front driversside. at ... hmmmm....if it's grinding, then probably a bearing.

Front Clunking sound when driving straight. - TDIClub Forums

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Dec 21, 2011 - I have a sporadic clunking noise from the drivers side front end. '98 jetta ... If I try to coast it gets really louder and more pronounced. ... whirring orgrinding could be several things: wheel bearing, brake pads due to a caliper ...

Quick Guide to Diagnosing Differential & Driveline Noises ...

Rods or rod bearings but also check the bearing caps from inside the oil pan

there can be a crack on exhaust manifold or on eghaust muffler.

Sounds like a wheel bearing. Jack up front end and spin wheels by hand and listen for grind. Same for rear wheels. Make sure brake linings are good all around. Do the swerve test. Drive down road bout 40mph and swerve moderately one side to other. If noise gets louder with weight shifted to one side more than other its most likely a wheel bearing.

wheel bearings most likley im a bit botherd by the "rotated front tyers" bit???

If you have a bad wheel bearing then you will have a vibration that you will notice. If that is the case then you have a bad wheel bearing.

If you had a hole in your muffler it would be loud all the time and be even louder upon acceleration. You could check this first by getting under your car while its running and see if exhaust is coming out where it shouldn't be.

Subikid90

Check the Alternator / Powersteering belts .
One of them will be damaged and loose.
Hope this helps.

Make sure you are running premium fuel. Also check egr tubes and make sure they are clean and also check egr vlave. May be clogged or just plain worn out.

belt tensioner needs replacing