![]() I know for a fact that on the earlier Ecotec’s, lack of oil changes can cause the timing chain tensioner to fail (or sometimes the chain gets stretched from rough usage). But is sounds more like it may be valvetrain, which is why I am asking how many miles. It could also be injector noise (as I have heard that the injectors are quite noticeable for the Sonic and Cruze). There seems to be a common issue with both the Sonic’s and Cruze’s with the motor mounts coming loose and making a rattling sound of sort.
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