Should I or shouldn't i

[jimr5454]

92 recommended but not trquired

 

[jimr5454]

Have u ever heard the sound in video?

 

[OR VietVet]

I did barely hear it and I could not pin point the noise because of other noises and how quick the noise is. All you have to do is run the higher octane and see if noise goes away. It should be a very quick fix if the right octane fuel is in the tank. If my owner's manual said 92 octane is recommended, I would run that, no questions asked. They recommend for a reason. Whether it is required would not make a difference to me at all. The higher octane fuel is way cheaper than the engine damage that can be caused by pre-ignition pinging. I have seen the damage done to pistons when the pinging went that far.

 

[jimr5454]

I did barely hear it and I could not pin point the noise because of other noises and how quick the noise is. All you have to do is run the higher octane and see if noise goes away. It should be a very quick fix if the right octane fuel is in the tank. If my owner's manual said 92 octane is recommended, I would run that, no questions asked. They recommend for a reason. Whether it is required would not make a difference to me at all. The higher octane fuel is way cheaper than the engine damage that can be caused by pre-ignition pinging. I have seen the damage done to pistons when the pinging went that far.

 

[jimr5454]

Antioch. This one easier to hear it?

 

[jimr5454]

https://youtube.com/shorts/LqQjJ22-d2wAntioch. This one easier to hear it?
Thank you very much

 

[OR VietVet]

The least expensive way to address this is a tank of 92 octane fuel. I do have to admit that it does not sound like any pinging I have ever heard before. If you have a mechanic's stethoscope, very inexpensive and important tool, you can pinpoint the source of the noise.

 

[jimr5454]

Thank you very much for your time.

 

[Tiredmechanic23]

The dealership is now telling me its nock from low octaine fuel being used .is that even possible with the sound only occurring when I push the gass peddle quickly and only for that ignition sound?
Any thoughts.
They say they took old fuel out and are running high octaine now to "clean it out " and see if the sound disapears...

Not much for it to clean out other than dilute the fuel in the tank with the high octane and bring the overall octane in the tank up. If it was a fuel ping they would quickly see a change in it after the new fuel starts circulation. Fuel additives difference is going to make no more a difference than what a can of seafoam or berrymans would have.

 

[tsuintx]

Old fuel? Seriously??? Why did it have old fuel in it? Has it been sitting on their lot for, say, a year or more? I’d say it’s time stop dealing with their BS and move on to something else.

 

[jimr5454]

i meant low octaine .bad fuel...
Were you able to listen to the video ? Does it sound like low octaine nock? I understand its a gueese but since I have never heard the sound of a low octaine problem I dont really know.
If it didn't like everything about this truck I would of walked away but I probably will walk away since I am unsure of this sound and all I do know is it shouldn't be making any noise when tapping the peddle ..uuuhhhhgggg

 

[OR VietVet]

At this point I would walk away because even if the noise leaves, whether from higher octane fuel or a repair, you will not trust it. It is of course your call.

 

[tsuintx]

At this point I would walk away because even if the noise leaves, whether from higher octane fuel or a repair, you will not trust it. It is of course your call.

This. Times eleventybillion.

 

[CMoore711]

You’ve already stated it’s a CPO vehicle so we’ll assume it’s at a Chevrolet/GMC dealership.

That being said; You’re saying that the selling dealer is hanging their hat on the reason for the suspect noise/issue is “low octane fuel”?

The manufacturer clearly recommends premium fuel for the L86 6.2L. So this GMC/Chevrolet dealer has a CPO vehicle and they have made the decision to not follow the manufacturer’s recommendation that they represent and their core business is based off of? Over what? An extra $15 +/- per full tank fill up?

Two words.... Run away.

 

[jimr5454]

All of the above is true.it is at a gmc it is certified ..it was below empty for test drive the salesman asked me to stop to get fuel he put it in.not sure he new it was recommended or not.they told me they mulked the few gallons he put in and put high octaine in and ran for approximatly 2 hrs and this morning salesman said sound is gone.uuhhgg I'm feeling stupid now...its really nice but you may be right

 

[wjburken]

All of the above is true.it is at a gmc it is certified ..it was below empty for test drive the salesman asked me to stop to get fuel he put it in.not sure he new it was recommended or not.they told me they mulked the few gallons he put in and put high octaine in and ran for approximatly 2 hrs and this morning salesman said sound is gone.uuhhgg I'm feeling stupid now...its really nice but you may be right

Please remember, walking away costs you nothing. Being overly optimistic and having wishful thinking can be very costly.

When you first posted, I was in support of you buying this vehicle, but the more you have shared, the more I think you need to walk away. Make sure to tell the dealer all the reasons you are walking away and then just walk away and don’t listen to them try and sweet talk you into buying it still.

 

[Miami-Dade]

All of the above is true.it is at a gmc it is certified ..it was below empty for test drive the salesman asked me to stop to get fuel he put it in.not sure he new it was recommended or not.they told me they mulked the few gallons he put in and put high octaine in and ran for approximatly 2 hrs and this morning salesman said sound is gone.uuhhgg I'm feeling stupid now...its really nice but you may be right

You should have walked away by now like the other smart members said. If you buy it you deserve the issues you get.

 

[jimr5454]

You should have walked away by now like the other smart members said. If you buy it you deserve the issues you get.

And so my search continues