Loud knocking sound coming from driver side rear of engine.

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Old 09-08-20, 05:15 PM
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Loud knocking sound coming from driver side rear of engine.

I have a 2011 3.6l v6 camaro. It still runs and drives but has a very loud knocking sound coming from the engine. There isnít any major vibration and no engine light. The noise comes and goes. I donít drive it anymore for fear of damaging it further. I have a feeling it is the lifters. I took it to a mechanic and they were no help. I want to just change out the lifters myself but I donít have the experience and canít find a step by step article or video. I donít have enough of a budget to pay a mechanic crazy hours to do it either. Is anyone able to help? I have a video of the noise but it wonít let me post it on here
 
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Old 09-08-20, 06:43 PM
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Welcome to the forums.

You'd need to post any videos at an external host like you tube and then link it to here.
 
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Old 09-09-20, 04:50 AM
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What did the mechanic say? Is he someone you trust? Can you expand on the noise coming and going? Is it related to engine going from cold to hot?
 
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Old 09-09-20, 05:10 AM
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Lifters are fairly easy to replace but they give more of a tapping/ticking sound not a loud knocking sound.
As asked above - is the noise temperature related?
 
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Old 09-09-20, 07:24 AM
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There could be a anti knock sensor going bad also. Think it would throw a code tho.
 
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Old 09-09-20, 07:52 AM
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That's not lifters. A knock would be more along the lines of rods or piston slap. Could be preignition if it shows up under load. You could try an additive to chase that down.

How many miles are on the engine and when does the knock show up?
 
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Old 09-09-20, 11:12 AM
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That's a transverse engine, right? Transmission is on the driver side? Or, engine?
 
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Old 09-11-20, 07:05 PM
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(((((((((((((((((((((())))))))))))))))))
 

Last edited by richard123vmt; 09-11-20 at 07:21 PM.
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Old 09-11-20, 07:12 PM
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Is the starter back there. Could be loose starter bolt. Just a thought. Otherwise, maybe, a bad inner cv joint? You need to get under it and look at what you have got. It can't knock if it is not there. Best thing is to use a hose to the ear to locate the source.
 
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Old 09-12-20, 01:13 AM
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That's a transverse engine, right? Transmission is on the driver side? Or, engine?
Otherwise, maybe, a bad inner cv joint?
You guys are just guessing, it's conventional RWD layout, not FWD.
 
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Old 09-12-20, 04:32 AM
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To me, this sounds more like something loose or broken or even a foreign object.
A broken shock is a possibility.

We just need some more info but after 4 days with no feedback, I'm afraid the OP is gone & wont be back.
 
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Old 09-12-20, 06:37 AM
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I am not guessing, I am asking simple question. Like I have nothing else to do but to research all engine layouts for any engine with question, posted here. All it takes is to say - it's longitudinal engine with driveshaft. See, how hard that was?
So where driver sits, it's left rear engine end and transmission next to his right leg. With according elimination of any knocking things in the engine front.
That said, "loud knocking" starts sounding like rod knock. Half shafts do not knock. They vibrate or make squealing noise in turns.
Got to go up on a lift and be checked. No telling hanging over the engine bay
 
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Old 09-12-20, 08:15 AM
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It still runs and drives but has a very loud knocking sound
That's NOT an encouraging way to describe a car.

Seems like they suck oil and burn bearings-


So, most likely rod knock and replace bearings.
Could be be broken piston rings, then you'd see shards when you change the oil.
I'd prepare to replace some piston rings and bearings.
https://www.rockauto.com/en/catalog/...build+kit,8512
 
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Old 09-12-20, 12:04 PM
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There isn’t any major vibration and no engine light. The noise comes and goes.
This right here ^^^^^^^ is why I am not going with an internal issue. Again, I think its going to be something mechanical.... a shock or a tie rod end about to come loose. It could be a foreign object that got picked up on the road, lodged in the engine compartment somewhere and it bumping around occasionally. I highly doubt its a starter. If it was so loose that it was bumping around, it wouldn't be connecting well enough to engage the flywheel long enough to start the engine..... and it would be making a heck of a noise when starting.
A strut, rack & pinion parts, but, I think if it was that loose/worn out, you'd know that as well. I just keep going back to something mechanical or something that doesnt belong there.
If it was a dropped valve or rod or a piston come apart, it'd be knocking for sure.... but it'd be knocking all the time & it also wouldnt be hard to diagnose.
 
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Old 09-12-20, 02:51 PM
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Without specific information from the person posting, it's all guessing.
 
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