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Hi guys, my saab 900 2.3i (about 148k miles) -95 is making a rattle noise under the hood, I don't know much about engines but what do you guys think? Could it be a bad timing chain/adjuster?

 

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check the upper chain slider (remove the valve cover it is mounted in the top of the valve cover) or you could have the infamous broken balance shaft chain slider which is what it sounds like to me.
 

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I know this sounds stupid, but don't run the car with the valve cover off ;ol; Search for the culprits AZR suggested, there are plenty of threads on them.
 
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