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All timing chain mechanisms have timing chain tensioners. Check to see that the tensioner mechanism is functioning correctly. Some are tensioned using spring tensioners, some use oil pressure, and some use a combination of both. The 2.4 liter quad 4 engine uses a fairly long timing chain, which wraps around the crank gear, water pump gear, and the 2 cam gears. The chain only grabs 8 teeth of the cam gears, a spring/hydraulic tensioner, to the upper left of the crank gear tensions the chain, but also 3 plastic guides help to hold the chain tight. If the tensioner is worn or the plastic shoes break, and yes they can break, or if the chain or cam gears are worn it is possible for the chain to jump, especially at high revs.

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15y ago
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Q: Why would the timing chain on a 98 4-cylinder Chevy Malibu jump?
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