Loud Engine Noise problems of the 2012 GMC Acadia

Car started running roughly. It was loud upon starting. The car would make especially loud noises when on curves. Then the check engine light came on. Had it checked by a mechanic. Was told the timing chain is bad and needs replaced. This mechanic told me he sees this problem a lot & it has to be repaired by a dealership. The dealership's cost for this repair is $4400. I can't afford that. Upon calling mechanics all over town, they all say it's a common problem with gm's timing chains.

We bought this used car from a dealer drove it about 4 to 5 months and the left signal light failed, so we changed it worked for one day and then went dead again. Turning left from my street the steering was really hard and had problems turning left but I did finally on another occasion the same thing happened. Finally driving suddenly we saw a turn engine off and the engine started making loud noises and went dead in the middle of the street. So we kept gliding with no engine running and went into a parking lot. Lucky for us the car stopped right in the parking lot. Had to be towed few miles to a mechanic that told us the timing chain is broken and in need for new engine. We towed it to another mechanic and the same thing was told. So now it is been sitting at the mechanic's shop for two week waiting for new engine to come in . I can not believe that around 84000 miles this car needs a new engine and it is not cheap at all. The car has a salvage tilte but this does not have anything to do with the problems since too many people have been documenting this problem, steering, electrical and failed engine. Why gm did not recall these cars for these failure. They are putting people and families at risk and we are stuck with the repairs and the bills piling up.

At 70,000 miles, the valve spring broke, and allowed the keepers of the valve to come out and then the valve dropped into the cylinder. The mechanic had never seen anything like this before, and called it a catastrophic failure. The cost to put in a new engine was $8922. 38, and then a couple days later, we had to replace the alternator, which was most likely caused by the engine failure. The engine failed while pulling out of a store parking lot - it just stopped. When we tried restarting the engine, there was a terrible noise (metal parts were grinding inside the engine).