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2022 Sierra HD 6.6 Gas Engine Spark Knock/Ping

ak503
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ak503 Enthusiast

ak503

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Does anyone else have what sounds like an engine spark knock or ping noise usually around 20-25mph when you push the gas pedal but just below the point where it needs to downshift?  As usual the dealers says its normal.  If it is, so be it, but I have to say I am disappointed in the quality of these trucks.  Between finding acorns inside the body channels under the hood and having to surgically remove with a camera and long grabber to my ongoing power steering whine (not the rushing noise) to this ping noise I am not impressed.  Thanks in advance.

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

Yeah that is a pretty normal sound to hear. The high pressure fuel pump is within inches of the firewall on the back side of the engine. The sound that thing makes can make it's way into the cabin.

 

I think on the earlier K2 trucks when the DI engines came out there was a boot or something on the steering shaft that may also let in engine compartment noise too. But I may be remembering that wrong, likely not a thing on the T1 platform trucks.

 

My truck makes the noise regardless of fuel as well. Can run 87 octane and it's there and I can run E85 fuel that will basically never show engine knock on a scan tool but the noise is still there, so it's not an actual spark knock.

ak503 Enthusiast

ak503

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Thank you - even if I can just hear that it is somewhat normal that makes me feel better given what these trucks cost!  Appreciate the response.  

  • 2 months later...
ak503 Enthusiast

ak503

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Bumping to the top with an update - went to another dealer that has been much more helpful.  Confirmed the spark knock is there and sent a bunch of data to GM  - hooked up to a couple computers and replicated on the road.  Hoping they can create an update for the timing/fuel management to address.  

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  • 1 year later...
BuckWallace Enthusiast

BuckWallace

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Posted (edited)
On 7/19/2022 at 6:04 AM, ak503 said:

Bumping to the top with an update - went to another dealer that has been much more helpful.  Confirmed the spark knock is there and sent a bunch of data to GM  - hooked up to a couple computers and replicated on the road.  Hoping they can create an update for the timing/fuel management to address.  

Sorry to resurrect this from the dead, but did you ever resolve this? My 2024 gas 3500 is making a weird noise at times around these same speeds right before/as it's shifting. I know if/when I take it into the dealer they either won't be able to replicate it or will say it's normal.

Edited by BuckWallace

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