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rackaddict82

Clattering/Rattling Sound when accelerating...

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Nice rack hahahaha I hope the top teir 93 octane cures all ails

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Yeah, I am shure that 91/93 will fix your problem. Let us know how it turns out. And if all is well then it will be time to get a Blackbear tune to unleash the potential of that 6.2

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I have the same truck, same set-up. My truck made the same noise when I picked it up from the dealer. I figured they gave me 50$ of reg gas.... yep. Topped up the tank with 93 it got better instantly. Next fill -100%. I don't always get a chance to put 93 but no pinging with 91 Octane. It's a 6.2 lt. giver what she needs. Fyi - you'll likely get better gas mileage. Just FYI - I kicked a 5.0lt 2017 Ford last weekend and I was pulling a heavier boat. He put $60 regular and my 6.2 took $46 same distance.... he didn't talk much about his Ford rest of the weeken!!! I'm Actually impressed with the gas mileage for a 6.2. and It never stressed me out when I bought it.

 

Who buys / drives a new truck and then comments they can't afford the gas...??? Sorry had to be said.

 

 

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Excellent! They are and have been only good to look at really....When it comes down to it, FERD's actually going to make yet ANOTHER V-8 because GM kicked their asses with the 6.2!

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Well shoot rackaddict82 run a few tanks of 93 octane and see if the noise goes away to test the "Infidels" theory. I never ran anything but 93 octane in my 16 for over 19,000 miles and plan on doing the same for this 17 for however many miles I keep it. No strange detonation noises except one time when I had a hand held programmer on it. I of course removed the tune immediately. Are you using a tuner/programmer?

Oh and what kind of user name is rackaddict?

Some people might get the wrong idea there!!!!

busty-babes-flbp-26.jpg?w=500&h=375

I'm sorry, you were saying?

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On 5/30/2017 at 10:37 AM, rackaddict82 said:

I have a 2017 GMC Sierra. 6.2L w/ Max Trailering pckg. The issue I'm having is when the truck is under power while I'm towing something or while going up a hill, I can hear like a clattering or rattling sound coming from underneath the firewall area. Once the vehicle down shifts and gets to a higher RPM it stops. It almost sounds like the old "pinging" noise from bad gasoline in older vehicles. It's driving me insane! I have tried to do a video/audio while it's happening but it doesn't turn out with my iPhone.

 

 

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Did you ever figure out what caused this?  Had it happen today and it freaked me out. 

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Did you ever figure out what caused this?  Had it happen today and it freaked me out. 


Yeah I started using 91/93 octane gasoline and it quieted down right away! Try that and let me know if it works for you too. Good luck man!


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Pip5570 is also another solution.

What is PIP5570??



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