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2005 Cobalt LS 2.2 - 105k on the dash

Earlier this summer I heard a weird ticking sound coming from the front. Got a second opinion, timing chain tensioner is what they thought.

Now the sound went away quite quickly and predominately reared its head on cold-starts and random start-ups.

Took it to a mechanic and he suspected it was my oil or sludge since the sound went away from the oil pressure had built up.

So ran half a can of seafoam in it for 20 minutes, then changed the oil. The sound went away for a few weeks, now its back. :suspicious:

Finding it hard to pinpoint what it is. Engine runs great after it warms up.
 

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Both timing and water pump chain tensioners are hydraulic but only the timing chain tensioner is dependant on Oil pressure. So if noise is on startup chances are it is your timing chain tensioner. GM now has a revised version of this mechanism. The new design has a bump on the head bolt and a retaining clip for the plunger.
 

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Have you checked that your valve cover is torqued down properly? Mine loosened and gave me a ticking noise until I bolted it back down.
 

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