![]() If that were the case in this problem, the timing may be off just enough for the valves to barely tap the pistons (as the intakes open 15 degrees before TDC).īut before going too far and taking stuff apart to find the issue, I’d suggest checking all of your mounts. ![]() 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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