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singing and detonation at highway speed on accel


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hello everyone I'm a Newbie here I own 2018 GMC Sierra elevation 5.3litre 6spd automatic I have 70,000km on it  I get pinging/detonation at highway speed when trying to accel faster. I am using Costco 87 octane is that my problem no check engine light I've tried octane booster(lucas) and it's still there any suggestions please

northerngmc

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Octane boost is about useless, don't bother with it.  With the tank almost empty, fill your vehicle with 93 octane gas and see if that solves your problem.  If it does, then you know your issue is poor fuel.  If it doesn't solve your issues then you need to start checking other things.  Also, dash lights do burn out so I would suggest scanning the PCM just to verify if there are any code or not.

 

Given the older model truck you drive, you would most likely get better advice by posting in the proper section for your year model vehicle.  If it's a common issue those individuals would know about it.

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Octane boost does work but you cannot have a full tank of gas. And it can't be the cheap stuff. It isn't going to make you go crazy but it will help you figure out if you got a bad tank of gas.

 

$30 a bottle for Madditive from VP or you are wasting you money. 

 

but yeah put in 93 first. I would suggest purchasing HPTuners and hooking it up to the truck and looking at the knock and see what is happening. It is basically a scan tool in these instances and allows you to watch what your computer is reading.

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On 10/19/2021 at 12:28 AM, C Tucker said:

hello everyone I'm a Newbie here I own 2018 GMC Sierra elevation 5.3litre 6spd automatic I have 70,000km on it  I get pinging/detonation at highway speed when trying to accel faster. I am using Costco 87 octane is that my problem no check engine light I've tried octane booster(lucas) and it's still there any suggestions please

northerngmc

Welcome to the site.

 

I would go to the closet Chevron station, and try 2 or 3 full tanks of the 91, 92, 93 (which ever they have, highest octane), and see if that helps. Then maybe work your way back down to the 87 over time, at Chevron to see how it is running.

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