2014 with pinging, spark knock
I started a thread in the GD section with the same title over a week ago. I have wanted to run a second tank of gas through before hitting the dealership, which I have just done. The pinging is still occurring when I initially push it hard. My question here is what testing, scanning etc should be done at the dealership.
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My experience has been that these DI engines are not prone to pinging--Only with some experimenting with extreme timing I was ever to get it to ping---The VVT system aids in low RPM loads to prevent detonation--IF you car is bone stock and has NOT been tuned
then you have an issue---More than likely a bad sensor somewhere---I am also in Calif where we only have 91 oct premium -----Did you try changing gas stations ??? How many miles ? Z51 or base model ? If you have a Z51 dry sump they are prone to sucking up oil via the PCV system--in the air intake tube----If you take off your air intake look inside the tube and around the throttle blade pre blade and post----If it is oily then you may need a catch can that many have done to prevent oil injection--------OIL ingestion will cause detonation !!!! |
On my ride sunday I was burning up the old fuel that was in my car from last oct.
I did notice light pinging earlier in the day before I filled my tank, I thinking it was the old fuel that was kind of flat from sitting that long. The last tank of fuel last year was from Exxon, whatever their highest octane is called, this time I filled my car with Shell 93. I didn't notice a ping after my fill, but I did go home shortly after, so I can't say it didn't ping because I really wasn't listing for it |
Originally Posted by tblu92
(Post 1589807985)
My experience has been that these DI engines are not prone to pinging--Only with some experimenting with extreme timing I was ever to get it to ping---The VVT system aids in low RPM loads to prevent detonation--IF you car is bone stock and has NOT been tuned
then you have an issue---More than likely a bad sensor somewhere---I am also in Calif where we only have 91 oct premium -----Did you try changing gas stations ??? How many miles ? Z51 or base model ? If you have a Z51 dry sump they are prone to sucking up oil via the PCV system--in the air intake tube----If you take off your air intake look inside the tube and around the throttle blade pre blade and post----If it is oily then you may need a catch can that many have done to prevent oil injection--------OIL ingestion will cause detonation !!!! |
Originally Posted by tblu92
(Post 1589807985)
My experience has been that these DI engines are not prone to pinging--Only with some experimenting with extreme timing I was ever to get it to ping---The VVT system aids in low RPM loads to prevent detonation--IF you car is bone stock and has NOT been tuned
then you have an issue---More than likely a bad sensor somewhere---I am also in Calif where we only have 91 oct premium -----Did you try changing gas stations ??? How many miles ? Z51 or base model ? If you have a Z51 dry sump they are prone to sucking up oil via the PCV system--in the air intake tube----If you take off your air intake look inside the tube and around the throttle blade pre blade and post----If it is oily then you may need a catch can that many have done to prevent oil injection--------OIL ingestion will cause detonation !!!! |
if YOU HAVE A BASE MODEL
If you have a base model it does NOT have a dry sump system--Dry sump systems often are overfilled--It is strange that your car the level goes up that high when cold--- My only thought on that is on your last oil change they used the wrong oil filter--- Most all GM newer cars utilize an oil filter with a built in check valve---The check valve is there to prevent the oil from dumping back into the pan after the engine is shut off--- K/N filters have both models so you with and without the check valve--make sure whatever brand you have has the built in check valve---- 5" above the "full line " could indeed create some oil ingestion and in return some detonation |
I went to a local dealership to have the best corvette mechanic from what I've heard, in the area test drive it. He noticed the pinging but since he hasn't heard of this happening with the base corvette he contacted an engineer at Chevy. The engineer had the capability of scanning the engine through this dealership since there were no codes. They said the timing was advancing correctly and everything looked normal. The car was checked at different points through warm up to normal temps. They are determining there is a problem with the fuel. I am having a difficult time with that since I have now run over 4 full tanks with different top tier gas at 93 octane with no change, and I have always used 93.
It only does it again while opening the car up and not under normal conditions. I still think its hurting the engine but I guess at this point will not run it hard(I only seldom do) and hope it eventually disappears. I wonder by stating its the fuel, if that covers the dealership if anything should happen to the engine as well. Does anyone have any other suggestions on what may be happening that they overlooked. |
you bought the car new or used?
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Are you sure it's not something else making the noise?
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I took the tune out of my car, I didn't hear it at all this past sunday, I think the diablo 93 octane tune pushes the timing just a bit too much.
It isn't really drastic just it's a light pinging, as if you ran lower octane fuel. Next tune I'm going to try the 91 tune. |
I bought the car new, the first 10k miles, no detonation. For the last 1500 miles I have heard it. It is a base car and not tuned.
The dealership is agreeing that the metallic ping under hard acceleration is detonation. They claim its the fuel but hard to believe that after changing up fuels and only using 93 octane for 1500 miles before they tested it. I was just hoping there were other ideas to what may be causing it. |
Originally Posted by jktenpro
(Post 1590000043)
I bought the car new, the first 10k miles, no detonation. For the last 1500 miles I have heard it. It is a base car and not tuned.
The dealership is agreeing that the metallic ping under hard acceleration is detonation. They claim its the fuel but hard to believe that after changing up fuels and only using 93 octane for 1500 miles before they tested it. I was just hoping there were other ideas to what may be causing it. If something big happens, you get to say I told you so, now repair it. |
Any oil consumption ? How much oil are you down after 1000, 2000 miles?
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Originally Posted by bob guzzy
(Post 1590001632)
This is how I see this, you reported a problem, they told you it was nothing.
If something big happens, you get to say I told you so, now repair it. |
Originally Posted by stab1991
(Post 1590002009)
Any oil consumption ? How much oil are you down after 1000, 2000 miles?
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The knock sensors on these DI engines are more sensitive than ever before on the LS based engines---So pinging is rare---Especially in un tuned---I would venture to say that even on a Silverdo DI engine pinging is a non issue---So if you are getting some audible detonation-- it can be only a couple things--either your gas is bad or your knock sensors are bad----I have tuned many Silverdo trks and GM claims they can run on regular 89 OCT fuel----But all of them pinged on 89 and the dealer told them to run 91 or better fuel---Nvere heard from those customers again--so I assume that that was a simple fix--As far as the C7 goes-- it requires hi oct fuel--from a gas station that doesn't cheat
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Originally Posted by tblu92
(Post 1590030766)
The knock sensors on these DI engines are more sensitive than ever before on the LS based engines---So pinging is rare---Especially in un tuned---I would venture to say that even on a Silverdo DI engine pinging is a non issue---So if you are getting some audible detonation-- it can be only a couple things--either your gas is bad or your knock sensors are bad----I have tuned many Silverdo trks and GM claims they can run on regular 89 OCT fuel----But all of them pinged on 89 and the dealer told them to run 91 or better fuel---Nvere heard from those customers again--so I assume that that was a simple fix--As far as the C7 goes-- it requires hi oct fuel--from a gas station that doesn't cheat
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