2014 4.3 2 wheel drive regular cab

[2014silveradobr]

I have a 2014 4.3 2 wheel drive Silverado and I have a noise coming from somewhere on the truck. I can’t figure out if it’s the engine, the transmission or the rear end. It only happens under light acceleration between 30-60 mph. I loose power when it happens too. I took it to the dealer and ofcourse they couldn’t replicate the sound. But it sounds like Chewbacca. Anybody know what this is?

[WHITESSTOWPIG]

You sure its not just the motor dropping into 4cylinder mode ? They will all automatically do that to save fuel and it will kind of sound like a helicopter but it can easily be disabled.You can toggle through the screen on your dash that says V6 and see if it changes to V4 while you have the issue.Thats the first thing I think everyone disables in these trucks

[2014silveradobr]

Well my truck is the work truck so I don’t know how to really tell when it drops down. I just know it’s a god awful noise always at low rpms.

[WHITESSTOWPIG]

You check it the exact same way I just mentioned on the work truck as well.There is a pin in your cluster you twist to toggle onto the screen that says " V6 ".You will see that change to V4 when you are driving and the cylinder deactivation is doing its thing which is what I think you maybe experiencing.

[2014silveradobr]

Well I know I have the digital speedometer, trip meter,mpg,oil life, trans temp, engine hours, and then a blank screen before going back to the digital speedometer. So unless I missed it on one of those screens I don’t remember seeing it

[Donstar]

On ‎2018‎-‎12‎-‎16 at 1:37 PM, 2014silveradobr said:

I have a 2014 4.3 2 wheel drive Silverado and I have a noise coming from somewhere on the truck. I can’t figure out if it’s the engine, the transmission or the rear end. It only happens under light acceleration between 30-60 mph. I loose power when it happens too. I took it to the dealer and ofcourse they couldn’t replicate the sound. But it sounds like Chewbacca. Anybody know what this is?

I assume you still have powertrain warranty so I'd return to the dealer and offer to go with the tech for a test drive.   Your truck should not sound like Chewbacca or a helicopter.   The AFM works seamlessly in a properly functioning setup.  It is very common for an initial diagnosis to come back as, "can not replicate".  This does not mean the problem doesn't exist but you may need to push a little harder!

[tmo]

You check it the exact same way I just mentioned on the work truck as well.There is a pin in your cluster you twist to toggle onto the screen that says " V6 ".You will see that change to V4 when you are driving and the cylinder deactivation is doing its thing which is what I think you maybe experiencing.

No, this only became a thing on the 2016+. I have a 15 and I hate that I can't see how many cylinders are firing. I recently had a similar noise at low RPMs but while idling or low speeds. When I took it to the dealership they said it was an exhaust leak. I'm not sure if it fixed the issue though.

[2014silveradobr]

Yeah I’m going to go to another dealer the one I went to seems to be a joke. And everybody I know that has gone there says their work sucks and only last a few weeks

[qwank]

I had a 4.3 come in that had the trans dipstick slightly touching the right side valve cover and in V4 mode it would rattle pretty bad.