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Message: <blockquote data-quote="Chevy Ecotec" data-source="post: 30984" data-attributes="member: 12158">I've never heard of a 3.6 running perfectly fine one day, without any codes or noises, and then not starting the next day due to the timing chain. I suppose it could happen. Not a fun job as you mentioned.We have 200,000 miles on our 3.6, and I haven't replaced anything on that vehicle other than normal wear items. We occasionally have the starting issue the OP described, but the procedure I mentioned gets it going again. I usually fill the tank and add a bottle of injector cleaner after it happens, just for good measure.</blockquote>