Some sort of knocking...

[babamerino]

Aloha from Hawaii!!! I had just recently purchased a 2011 Tahoe LT from a local Chevy dealer and I am noticing a repetitive knocking sound when I start to accelerate. I only hear it at the low rpms accelerating or cruising while barely accelerating... It kinda sounds like a machine gun knocking sound... I do have warranty and I am going to call them but I want to know if any of you gearheads know anything about this? But at WOT or higher rpms I donʻt hear it...

Mahalo

Baba

 

[babamerino]

Some sort of knocking sound...

Aloha from Hawaii!!! I had just recently purchased a 2011 Tahoe LT from a local Chevy dealer and I am noticing a repetitive knocking sound when I start to accelerate. I only hear it at the low rpms accelerating or cruising while barely accelerating... It kinda sounds like a machine gun knocking sound... I do have warranty and I am going to call them but I want to know if any of you gearheads know anything about this? But at WOT or higher rpms I donʻt hear it...

Mahalo

Baba

 

[Blazed]

Maybe the truck is tuned and requires premium gas. Try to fill up with premium next time you run out and see if that solves the problem.

 

[babamerino]

Maybe the truck is tuned and requires premium gas. Try to fill up with premium next time you run out and see if that solves the problem.

I know for a fact that itʻs not tuned but Iʻll try that anyways!!!

Thanks

 

[mike1944]

My 2010 Denali would clatter like a factory on start-up if it had been sitting for a few days. Dealer replaced all of the lifters under warranty.

Read somewhere the problem is with the synthetic oil - old design lets it drain out. No problems since.

 

[doubletapdrew]

Yesterday GM issued a recall about the tranny dipstick tube cracking and making a knocking sound. The fix is to replace it if bad and add a neoprene ring around the base to better insulate it.
Might want to take it to the dealer and have them check that out. Should be free.

 

[Blazed]

Don't think 2011 had 6.2 option but my moms 6.2 has a little clunk while under light throttle on 87 octane

 

[Zed 71]

IMO just bring it to the dealer since it is under warranty and have the issue logged. BTW are you using Tier 1 gas (Chevron, Phllips, etc.)? Any other mods?

 

[GM Customer Service]

babamerino,

I'm sorry you are experiencing this issue. I would be happy to check my resources for any known issues. If you would like me to proceed, please PM me your VIN.

I look forward to your reply.

Louis
GM Customer Service

 

[babamerino]

Update...

So on the next empty tank I put the 92 or highest octane and also put the all in one fuel system cleaner... INSTANT improvement on EVERYTHING!!! I forgot to mention that I was using the lowest octane... There is however a slight knock but barely noticeable... I only used half of the bottle of the fuel system cleaner (cause I only put in half tank at a time) so on the next empty tank I will put the rest of the bottle in... So I will continue to keep my ear to my engine and keep you all updated!!! Thank you all so much for your input!!!

As far as mods Iʻm bone stock!!! But I will be asking around for ideas!!! Its just hard since I'm all the way here in Hawaiʻi!!! Shipping (or the absence of to Hawaiʻi), or having other Hoe owners to talk to about stuff. But I basically want to do the norm... Intake, exhaust, all black everything, 24ʻs, Retrofit, LED everything, drop... u know... the NORM!!!

Mahalo

Baba

 

[Zed 71]

On the next tank just try and use Teir 1 87 octane gas. No need for higher octane on a stock truck and it will have cleaning agents also.

 

[babamerino]

On the next tank just try and use Teir 1 87 octane gas. No need for higher octane on a stock truck and it will have cleaning agents also.

Thatʻs probably why... Iʻve been using a local company and maybe they are not teir 1... Iʻll look into it!!!

Mahalo

 

[babamerino]

Hereʻs an update on my Hoe... I have been running experiments with the different brands over here in Hawaiʻi so Iʻve come to find out that its not the different brands or octanes but rather my HOE!!! No matter what brand/octane I used it still had that machine gun-like knocking sound when I accelerate slightly at low RPMS... So I have decided that I am going to take it in to my dealer...

But on a lighter note... Happy Thanksgiving!!!

 

[babamerino]

Hereʻs an update to my HOEʻs knocking... So I have been using different brands/octanes in my Hoe and unfortunately there still is a machine gun-like knocking sound when I slightly accelerate at low RPMS... So I have decided to take it in to the dealership...

But on a lighter note... Happy Thanksgiving!!!

 

[SunlitComet]

this is a service bulletin from gm on gasoline usage. benefit from it. big difference in ten thousand miles no?

http://www.355nation.net/forum/serv...tin-top-tier-detergent-gasoline-u-s-only.html

---------- Post added at 03:18 AM ---------- Previous post was at 03:17 AM ----------

i could not find any bulletins on your knocking noise other then possible incorrect oil filter or install.

 

[SunlitComet]

this is a service bulletin from gm on gasoline usage. benefit from it. big difference in ten thousand miles no?

http://www.355nation.net/forum/servi...-u-s-only.html


i could not find any bulletins on your knocking noise other then possible incorrect oil filter or install.