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Discussion Starter #1
I was hoping to shed some light on what happened to my 2011 GMC Acadia SLE the other day....
I was cruising along at about 55 mph when it felt like the engine died for a second, then kept going on it's own. Cruised for another half mile or so then the engine just died, tried to restart in neutral as I was rolling but the battery was instantly dead. I coasted to a stop, tried to start in park but the battery was completely dead. I tried a jump pack but it wasn't enough, decided it must be a bad alternator/old battery combo. Called AAA and had it towed home. As soon as I tried jumping it at home the engine fired right up, but there was now a LOUD knocking sound coming from the lower end of the engine. I quickly shut it down, checked the oil (which I had checked only 1 week prior) and found it was 1 quart down, no bad color either. Filled the 1 quart, started it back up, still heard horrible knocking sounds.... Battery and alternator seem ok....
Does anyone know what could have happened??
 

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A bad piston wrist pin will produce the same type of sound.
 

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Parts in engines wear out over time. Can't really predict when and not always why without a complete engine tear down.
 

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+1 No one can tell for sure without some kind of forensic analysis. In essence, an engine abuses itself internally each time it is started. Failure could occur at any time without any warning knock, too. I've seen engine (and transmission) failures in a few new vehicles as the cars/trucks were being delivered to the dealership. I've also seen some very high mileage vehicles with original parts pass through a dealership service department. "It's in the luck of the draw."
 

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Discussion Starter #8
I am not a mechanically ignorant person, I know how an engine works and that they are far from perfect. That being said I do know how to take care of an engine, I have had many high mileage vehicles with little to no problems. This is the SECOND Acadia I have had this issue with, the first one was an '10 SL, it had basically the same thing happen out of nowhere with 112,000 miles on it, now the '11 SLE with 109,000 miles has it happen as well, no codes thrown, no warning lights. I have looked it up and found other people have had similar problems with no actual reason found as to why. I even found 2 stories of Acadia owners merely changing a dead battery to find the engine knocking upon restart. It seems to me that this engine has some flaws that need to be addressed. Does anyone out there have an actual answer or just vague responses????
 

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None of us can hear the sound in person, we didn't drive it, the vehicle is not in front of us, we're all just fellow Acadia owners... there's only so much assistance or guidance any member here can offer. To be sure you'll have to bring it into a mechanic.
Has the timing chain ever been replaced? If you had another with "basically the same thing happen" what was that vehicle's outcome?
 

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Be careful when you close the door.
Or as the old saying goes "don't let the door hit you in the a$$ on your way out"
 

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I am not a mechanically ignorant person, I know how an engine works and that they are far from perfect. That being said I do know how to take care of an engine, I have had many high mileage vehicles with little to no problems. This is the SECOND Acadia I have had this issue with, the first one was an '10 SL, it had basically the same thing happen out of nowhere with 112,000 miles on it, now the '11 SLE with 109,000 miles has it happen as well, no codes thrown, no warning lights. I have looked it up and found other people have had similar problems with no actual reason found as to why. I even found 2 stories of Acadia owners merely changing a dead battery to find the engine knocking upon restart. It seems to me that this engine has some flaws that need to be addressed. Does anyone out there have an actual answer or just vague responses????
What actual answer do you want? You have a 10 year old vehicle with 109k miles. Without tearing down the engine people on the internet can only speculate.

If it is a spun bearing, bearings generally spin due to a lack of lubrication. There can be a number of things that can cause a lack of lubrication.

Sorry we disappoint you but your expectations seem way too high.
 

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All's well that ends well.

Sorry it wasn't much help for OP, but how was the vehicle maintained?

Proper oil change intervals? Oil levels checked regularly? etc. . . . Issues with the early 3.6L V6 are pretty evident on many forums.

Mostly. . . if the previously owned 2010 SL had the "same" problem. . . have to wonder why wait till now to ask questions? Joined in April of 2018.
 

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What brand of Oil filter did he use? I bet he used an inferior oil filter and the least expensive oil he could buy. I had an 08 with 212,000 miles, never a lubrication problem, Mobil 1 all the way.
 
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