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Unlikely a mount would be bad. Just the bolts may be loose. Check the bushings for cracks (which being just less than 2 years old, it’s highly unlikely) while looking at the mounts to see if they need replacing. As for checking if the mounts are tight, you will need the following size sockets/wrenches (98% of the time): 13mm, 15mm, and 18mm.
I would check the mounts (I edited my first post for more information from my experiences with the Ecotec’s and what I have heard about the Sonic’s and Cruze’s with the 1.8l)
I would check the mounts (I edited my first post for more information from my experiences with the Ecotec’s and what I have heard about the Sonic’s and Cruze’s with the 1.8l)
How many miles does it have?
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. It could be that. It could also be injector noise (as I have heard that the injectors are quite noticeable for the Sonic and Cruze). But is sounds more like it may be valvetrain, which is why I am asking how many miles. 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). 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).
But before going too far and taking stuff apart to find the issue, I’d suggest checking all of your mounts. Typically I have seen 2 mounts (head to the chassis and oil pan to the subframe) on the engine and 2 on the transmission (one towards the driver’s feet on top and one towards the fog/headlight on the bottom).
How many miles does it have?
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. It could be that. It could also be injector noise (as I have heard that the injectors are quite noticeable for the Sonic and Cruze). But is sounds more like it may be valvetrain, which is why I am asking how many miles. 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). 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).
But before going too far and taking stuff apart to find the issue, I’d suggest checking all of your mounts. Typically I have seen 2 mounts (head to the chassis and oil pan to the subframe) on the engine and 2 on the transmission (one towards the driver’s feet on top and one towards the fog/headlight on the bottom).