If it is indeed a lower end knock I dont think the tune would have anything to do with it. Put the stock PCM back in and drive it around easy as long as you can. If it still knocks then take it in. Does it knock constantly ,on startup, or when its warmed up ? Video ?

 

^This.

SO what you're hearing is an audible low end knock, correct? Rod knock. Spun bearing.

Something seems a little fishy here if it's on a brand new engine in such a short time.

Are you SURE they just didn't rebuild it and actually replaced it with a full new motor (block and all)? I know when mine went in for engine work, it was rebuilt NOT replaced. I ask because I would feel suspect that the engine builder might have skimped on replacing rod bearings when rebuilding OR could have made an error on install.

How many miles were on the motor when it blew the first time???

 

No I didnt get the car retuned with new motor and turbo. The car is on its 2nd oil change Changed the oil with 800miles on it then at 3300miles. Car runs fine just has a very unknown knock. Sounds low end. I have a vid but very hard to determine due to DI.

 

Does your work know you're aftermarket tuned?

I'd find someone who you trust at work and that has been around the block a few times, ask them on what your next move should be.

 

Please explain your problem more, low end knock? How much are you seeing and at what? full or part throttle? How cold is it where you are? What kind of gas are you using, and how aggressive is the tune?

 

I think he is talking about audible knock , doesn't seem like he has any monitoring tools to me. But I could be wrong.

 

^^ This

 

Yep.

When explaining something as "Low end knock" it's referring to audible knock from either rod bearings or crank bearings spun or gone bad. If it's a mild 'thud' sound, it's crank. If it's a higher pitch more frequent "knock" it's rod bearings and if it's more like a pair of high pitched knocking sounds it's the wrist pin.

We need more info OP.

 

He should log the car then to know exactly what's going on.

 

If its low end/bottom end knock, he should not drive it what-so-ever and have it towed to the dealer. Running that motor any more will result in more serious engine damage and could eventually lead to a rod right out the side of his block.

 

He needs to have the stock ECM in there and has to run it a bit after he puts it back in. A video with sound would help

 

He's gotta do what he's gotta do. But yes, a video with sound would be most helpful at this point.

 

X2. I don't think it was the smartest thing to throw in the tuned ecu from the other motor either. I mean I wouldn't expect my tune to be 100% on the money if I loaded it into another local car. Not saying that this is the cause. Best thing to do would have been to throw in the tuned ecu make a log and send to BYT to make sure all is well.

 

If its a rod bearing, sounds like the wrong oil was used.

 

OP i would delete this thread and do this^^^ Good luck and i hope its nothing major.

 

Sarah may of ratted you out already!! :P

 

mine did it before and after i changed o2, only when u lightly accelerate. stock tune or other tune, doesnt matter. lots of guys see it with dashdaq.

 

The shop foreman knows what is done to my car. The knows is not heard when the car is being drove only when sitting with car idling around 1800

 

Noise is not heard under throttle when moving. the coldest it has been is 9degrees. All i run is 93 from mobil or shell.

BYT 24psi tune

 

It has not really been monitored yet. All i have is aeroforces. I can hook up the tech 2 and drive around the block with it to see if it will pick up on it.

 

So this noise is like rod knock? PLEASE explain because some think you're talking about the audible knock from a spun bearing and others think its your basic Knock Retard in timing.

If it's an audible rod knock at idle but goes away when raising RPM, then it's probably an oil pressure issue. Either the pump is bad, the oil used is too thin or way to thick or a bearing is very worn.

Again, please explain and/or post a video with sound of what you're talking about.

 

Not knock retard. Sounds like a rotating assembly issue. i do have a vid but the noise is very very low. The noise gets louder when rpm is raised. I will try and get a better vid.

 

Okay. Now that's cleared up

Sounds like a spun rod bearing. Put your stock ecu back in, drive it for a day and then take it back to the dealer.

 

"Noise is not heard under throttle when moving."
and "The noise gets louder when rpm is raised. "

Noise gets louder when throttle is increased in neutral but doesnt when driven?

 

I think it might be faint enough that he can't hear it while in the car driving.