Question about 2001 Hyundai Accent

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1.5 L. single overhead cam engine / 125000 KM. runsgreat, idles smooth but when run up and above approx. 1500 rpm there is a rattling noise coming from what sounds like a marble bouncing around in a cylinder being hit by the piston except that it sounds like it is coming from not that deep in the motor / rocker assembly? Do these motors have hydraulic rockers and one of them could be weak or collapsed ? OR ? Thanks

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  • Hyundai Master
  • 5,568 Answers

This could be bearing (rod or crankshaft) rattle or a rod cap that is coming loose- I lost one engine thinking it was only an exhaust line hitting somewhere. You might try (using appropriate caution around moving parts) using a long screwdriver with the blade touching various points along the cam shaft cover or the block itself and placing the handle end on or behind your ear. One can often locate the area of the noise fairly accurately.
Modern engine analyzer can often diagnose such a sound and it might be worth a few bucks to have it analyzed before it becomes a death rattle.
BTW, we have 3 vehicles, not counting our kids' various junkers, and each time a new one enters the stables, we buy the Haynes service manual for it; for the few dollars, they can help avoid unnecessary trips to a service shop and give you an idea why the labor costs are so high (if they are.)
Hyundai '91 Accent

Posted on Apr 28, 2010

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Posted on Jan 02, 2017

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