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  #25  
Old 09-26-2016, 08:50 AM
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Quote:
Originally Posted by vnbWK2 View Post
Today was only 70 degrees and I hardly heard any pinging. Still on same tank of gas.
Well I take that back. Driving to work this morning I heard it every single time I stepped on the gas while in 3rd gear going like 20 miles per hour. I'm really getting sick of this already. Down to about a quarter tank so I'm switching to 89 today to see what happens.

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  #26  
Old 09-26-2016, 09:49 AM
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Re: New 2017 pinging?

I've done about 60k across 3 V6s and towed 4000lbs and I've never heard it knock.

All modern cars adjust the timing based on the octane, temp, humidity.

And I always use 87 usually name brands. Mobile, Shell.

If I'm not mistaken engines can be set for specific altitudes, might check into that.
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  #27  
Old 09-26-2016, 12:58 PM
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Re: New 2017 pinging?

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Originally Posted by mswlogo View Post
I've done about 60k across 3 V6s and towed 4000lbs and I've never heard it knock.

All modern cars adjust the timing based on the octane, temp, humidity.

And I always use 87 usually name brands. Mobile, Shell.

If I'm not mistaken engines can be set for specific altitudes, might check into that.
I had a 2014 and 2011 Grand Cherokee with the V6 and never had a problem using 87. I would think the knock sensors would take care of the pinging by adjusting timing on the fly seamlessly.
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  #28  
Old 09-26-2016, 06:16 PM
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Just filled up with 89 octane at my local Sunoco station. Receipt says 16.6 gallons.I had one quarter tank left when I filled up which means that I probably have still 8 gallons of 87 octane mixed in with the 89 octane. As I was driving home I definitely noticed a difference, probably 80% pinging is gone. I drove up an incline that would normally ping and while in 3rd gear going 20 miles per hour as I stepped on the gas to test it I heard a very slight hint of pingingg, not nearly as bad as before. Is it reasonable to attribute this to the fact that I do still have some regular 87 octane in the tank and that it takes a little longer to adjust? I only drove 1 mile from the gas station to my house. Should I notice an immediate difference or should I give it a few more miles?
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  #29  
Old 09-26-2016, 07:47 PM
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Re: New 2017 pinging?

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Originally Posted by vnbWK2 View Post
Just filled up with 89 octane at my local Sunoco station. Receipt says 16.6 gallons.I had one quarter tank left when I filled up which means that I probably have still 8 gallons of 87 octane mixed in with the 89 octane. As I was driving home I definitely noticed a difference, probably 80% pinging is gone. I drove up an incline that would normally ping and while in 3rd gear going 20 miles per hour as I stepped on the gas to test it I heard a very slight hint of pingingg, not nearly as bad as before. Is it reasonable to attribute this to the fact that I do still have some regular 87 octane in the tank and that it takes a little longer to adjust? I only drove 1 mile from the gas station to my house. Should I notice an immediate difference or should I give it a few more miles?
That 87 octane still in the fuel lines is still there and undiluted. It will work out after some miles.
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  #30  
Old 09-26-2016, 07:58 PM
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Re: New 2017 pinging?

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Originally Posted by vnbWK2 View Post
I would think the knock sensors would take care of the pinging by adjusting timing on the fly seamlessly.
When knock is detected, software determines knock intensity and decides how many increments to retard this cylinder the next time it fires. The control software retards in proportion to the knock event. It's not seamlessly it's actually behind the cylinder event when it first knocks.
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  #31  
Old 09-27-2016, 07:11 PM
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So I drove to work this morning and back home all of 20 miles and it seems like the pinging is definitely much improved, probably 80 - 90% gone. When I went to Sunoco yesterday I filled up with 89 at the pump.....Sunoco had 87, 89, 91 and 93 octane. As there probably aren't 4 separate tanks for each of the four octane levels, I'm wondering if Sunoco 89 octane is a blend of 87/91 and if 91 is a blend of 89/93? Of course 87 and 93 would not be blended. If so, that probably means that shell 89 octane is a blend of 87 and 93, since Shell has 87, 89 and 93..... 91.

I'm hoping that my pinging will be 100% gone at my next 89 fill up, as most of the tank would then be 89....no trace of 87 left.
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  #32  
Old 09-27-2016, 08:38 PM
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Re: New 2017 pinging?

Quote:
Originally Posted by vnbWK2 View Post
So I drove to work this morning and back home all of 20 miles and it seems like the pinging is definitely much improved, probably 80 - 90% gone. When I went to Sunoco yesterday I filled up with 89 at the pump.....Sunoco had 87, 89, 91 and 93 octane. As there probably aren't 4 separate tanks for each of the four octane levels, I'm wondering if Sunoco 89 octane is a blend of 87/91 and if 91 is a blend of 89/93? Of course 87 and 93 would not be blended. If so, that probably means that shell 89 octane is a blend of 87 and 93, since Shell has 87, 89 and 93..... 91.

I'm hoping that my pinging will be 100% gone at my next 89 fill up, as most of the tank would then be 89....no trace of 87 left.
Next time you go count how many caps they have. There will be one for each tank.

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  #33  
Old 09-27-2016, 09:17 PM
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Next time you go count how many caps they have. There will be one for each tank.

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  #34  
Old 09-27-2016, 09:24 PM
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So here is an areal view of the Shell gas station. Are the 3 dark round circles on the bottom left the caps to the tanks? If so then there are 3 separate tanks at this Shell station, 87, 89 and 93.

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  #35  
Old 09-27-2016, 09:27 PM
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Re: New 2017 pinging?

Quote:
Originally Posted by vnbWK2 View Post
So here is an areal view of the Shell gas station. Are the 3 dark round circles on the bottom left the caps to the tanks? If so then there are 3 separate tanks at this Shell station, 87, 89 and 93.

Attachment 72447

Looks like it.

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  #36  
Old 09-27-2016, 09:57 PM
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Re: New 2017 pinging?

Quote:
Originally Posted by Michael Plummer View Post
When knock is detected, software determines knock intensity and decides how many increments to retard this cylinder the next time it fires. The control software retards in proportion to the knock event. It's not seamlessly it's actually behind the cylinder event when it first knocks.
This! The computer should be adjusting for any ping/knock. Even if ping is gone with 93 gas, but returns with lower octane gas, the dealer should check it out IMO. But make sure you have 87 gas in the tank, and you have ping when you take it in ...
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