2015 Silverado 5.3 Rattle

[Sean007]

 

[Snowcamo]

Holly fauck bro...

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[Snowcamo]

That's a tough one man. Im leaning towards the trans install since its just been swapped and afm isn't a consideration in park. I'd drive straight back to him in the a.m.I'd have the trans dude triple check his work man.

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[Sean007]

Question I'm old school Chevy and Ford these new LS's are greek to me with all the AFM/DOD stuff. If it was a lifter would it not do it all the time not just sporadically and some times not at all. Just drove 15 miles home on freeway and nothing at highway speeds no miss or anything. Get close to home and pull into farm and right before parking it starts it. Had wife rev motor up and I swear it sounds like it is coming from underneath. But not 100% but pretty sure.

[Snowcamo]

Question I'm old school Chevy and Ford these new LS's are greek to me with all the AFM/DOD stuff. If it was a lifter would it not do it all the time not just sporadically and some times not at all. Just drove 15 miles home on freeway and nothing at highway speeds no miss or anything. Get close to home and pull into farm and right before parking it starts it. Had wife rev motor up and I swear it sounds like it is coming from underneath. But not 100% but pretty sure.

Yeah these new LT motors can be tricky. Lifters can be tap at idle if tolerances are loose, the as the rpms go up they pump up and can get silent.

If i was you id focus on the trans. It sounds like something went loose.

Did he tune the engine at all besides turning off the afm?

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[Sean007]

No tube just turned off AFM and adjusted tire size. 

[Sean007]

I’m going to drive to get warm today and pull valve covers and see if there is anything loose if not going to tranny guy. I just want to make sure before getting charged to pull tranny and flexplate is good

[Snowcamo]

Bo you keep driving like that and it will hit the fan at some point. If your going to pull the valve covers just do it. Wont be any different. That said btw you speak about these chain of events leading up to this... Its on the trans guy. He should dive into this and figure it out.

 

What brand tq converter did you install?

 

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[Sean007]

Took both valve covers off after running truck and rattle started nothing loose no rocker play everything is tight. Just talked to tranny guy he said he can turn AFM back on. Also said he talked to a gm mechanic friend and he said it is the AFM/DOD will see.

 

[Sean007]

AFM/DOD turned back on still does it a little not as loud. I am at a loss.

 

[Sean007]

Just updating truck issue. Found the rattle not tranny, or anything associated with tranny. Spun rod or main not good at all.