Thread: 87 300SDL - Intermittent Loud Noise from Timing Chain Enclosure
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Old 09-19-2007, 08:28 PM
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Hit Man X Hit Man X is offline
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First thing would to NOT drive nor start the car in its condition so you can isolate the issue.

When I had that issue, it was my vac pump taking a dump.

Consider pulling the valve cover and taking a peek inside to what you see. Maybe your upper chain guide is broken. Maybe you need a tensioner. Maybe the tensioner arm is going bad.
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I'm not a doctor, but I'll have a look.

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