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Sonata timing belt

I OWN a 1997 Hyundai Sonata sedan five-speed with a 2.0-litre engine that's been going great. A few weeks ago it began to give trouble and a mechanic fitted a new timing belt and pulley. This got it going again, though not at 100 per cent. He said it could be bad fuel and a blocking injector, or possibly the timing belt jumped a tooth, causing a bent valve. This in turn made the car sound as if it was firing on four, then three, then four when at warm idle. Now he seems to have fixed it, but at idle it sort of chugs a bit.

IT SOUNDS as if you have a bent valve. The Sonata engine has to be correctly aligned when the belt is changed and it's difficult to do. The other thing to check is the balance belt -- it should also be changed, and needs to be correctly aligned when the new cam timing belt is fitted. It's easy to get the balance belt 180 degrees out.

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