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Old 06-16-2012, 06:08 PM   #1
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The pinging is back!

Switched back to 87 octane and the pings are back. Going to have to stick with 91 octane I guess. Why does this happen? The Jeep should be able to run on 87.

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Old 06-16-2012, 06:13 PM   #2
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What gas station do you go to? Check out this website. With any of these here you shouldn't have any pinging issues with 87 octane.

Top Tier Gasoline

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Old 06-16-2012, 06:14 PM   #3
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Potentially happens because the ECM advances the engine timing under certain conditions or because you have a build-up of carbon on the heads of the pistons.

I assume you have seafoamed the intake and added some to the fuel?

Does your engine ping constantly or just under hard acceleration. Does it ping while you are cruising or accelerating normally?
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Old 06-16-2012, 06:24 PM   #4
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Seafoam in the gas once a month. Its easier for preventative maitenence then the neglectfull repair bill : D
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Old 06-16-2012, 06:46 PM   #5
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Stick or auto? I can see how if you lug a stick it would ping, I have only run 87 in mine no pinging that I can detect.
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Old 06-16-2012, 09:02 PM   #6
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Quote:
Originally Posted by Spro12JK
What gas station do you go to? Check out this website. With any of these here you shouldn't have any pinging issues with 87 octane.

Top Tier Gasoline
I have been using the Hess station for the last year. So you think if I switch to one of these stations on the list the pinging will stop?
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Old 06-16-2012, 09:03 PM   #7
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Quote:
Originally Posted by SilverSport
Potentially happens because the ECM advances the engine timing under certain conditions or because you have a build-up of carbon on the heads of the pistons.

I assume you have seafoamed the intake and added some to the fuel?

Does your engine ping constantly or just under hard acceleration. Does it ping while you are cruising or accelerating normally?
Mostly hear it while accelerating not cruising.
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Old 06-16-2012, 09:05 PM   #8
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I know about the sea foam product. Is all you have to do is put it in your tank? Silver sport mentioned adding some into the intake. Please explain.
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Old 06-16-2012, 09:08 PM   #9
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I have been using the Hess station for the last year. So you think if I switch to one of these stations on the list the pinging will stop?
It is definently worth a try. I only use gas from the top tier list and have never had problems ever with any of my cars/trucks. I remember a long time ago my mom had a ford ltd and we were using clark gas and it was pinging and making all kinds of noise on acceleration and when we switched to mobil the noise went away. Gas companies use different detergents which makes a big difference. Keep us informed on what happens with yours.
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Old 06-16-2012, 09:09 PM   #10
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Quote:
Originally Posted by pkmcd99
Seafoam in the gas once a month. Its easier for preventative maitenence then the neglectfull repair bill : D
How much seafoam?
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Old 06-16-2012, 09:34 PM   #11
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Quote:
Originally Posted by pasteris71 View Post
I know about the sea foam product. Is all you have to do is put it in your tank? Silver sport mentioned adding some into the intake. Please explain.
Open this link and scroll down to the fuel injected section. You add it thru the brake booster vacuum line: Sea Foam | How to Use Sea Foam Motor Treatment

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How much seafoam?
One 16 oz can to 3/4 tank of gas. Run it down to 1/8 - 1/4 tank before refilling.
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Old 06-16-2012, 10:08 PM   #12
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We talked about this before right?

Knock sensor ?
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Old 06-16-2012, 10:16 PM   #13
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Quote:
Originally Posted by kjeeper10 View Post
We talked about this before right?

Knock sensor ?
But a knock sensor shouldn't make an engine ping. Its job is to sense engine knock or ping and "tell" the powertrain control module so it can retard engine timing.
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Old 06-16-2012, 10:21 PM   #14
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Quote:
Originally Posted by SilverSport

But a knock sensor shouldn't make an engine ping. Its job is to sense engine knock or ping and "tell" the powertrain control module so it can retard engine timing.
Ok... So if it's defective the engine would ping and not retard timing ?

I wish I still had the thread. It was a common problem and replacing the KS was one of the fixes.
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Old 06-17-2012, 08:10 AM   #15
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Try another gas station. That's always step one for this problem. After that if it still does it then take it to the dealer. A 2011 should NOT be pinging. PERIOD.
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Old 06-17-2012, 08:26 AM   #16
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Quote:
Originally Posted by kjeeper10 View Post
Ok... So if it's defective the engine would ping and not retard timing ?

I wish I still had the thread. It was a common problem and replacing the KS was one of the fixes.
Yes, a defective knock sensor would allow for excess pinging. The OP said he gets pinging during acceleration and not cruising. No ping during cruising is good. The question I still have is does he get ping during norml acceleration or hard, full throttle acceleration?

Quote:
Originally Posted by j0nx View Post
Try another gas station. That's always step one for this problem. After that if it still does it then take it to the dealer. A 2011 should NOT be pinging. PERIOD.
To say the engine shouldn't be pinging at all is wrong. The powertrain control module will advance the timing during acceleration, especially hard acceleration. During hard acceleration (especially an engine with a manual transmission at low rpm), the knock sensor detects the knock or ping. If the ping exceeds the maximum amount the engineers deemed safe, the signal is used by the powertrain control module to retard the timing.

So slight ping under certain conditions is normal. I would wager alot of members here get some ping and never hear it because the windows are down/top is off or the radio is on.

During normal acceleration or when cruising, there should be no knock. Under hard acceleration, a small amount of pinging for a few seconds is normal, especially with a manual. An automatic will automatically downshift, raising rpms, so pinging is less likely.

The OP states there is no pinging while crusing which is normal. What I don't know is does the pinging occur all the time during normal acceleration or just in hard acceleration situations.
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Old 06-17-2012, 08:32 AM   #17
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Sounds normal to me. Run it, your good to go, stop listening to your engine and turn up the radio.
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Old 06-17-2012, 10:43 AM   #18
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No pinging here, and I use 87 only. I do seek out Shell stations mostly. I like Chevron but not too many around here. Once in a while, a Valero or Conoco will be thrown in.

Oh, I use no fuel or engine additives and never have. I do not trust them.
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Old 06-17-2012, 10:01 PM   #19
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Have to admit Silersport was right. I filled up today at Mobil and have not heard a ping all day. Wondering if the other place just had bad gas. Either way I will not go back there!
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Old 06-17-2012, 10:19 PM   #20
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You filled up with 87 octane?
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Old 06-17-2012, 10:36 PM   #21
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Sure did.
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Old 06-17-2012, 11:52 PM   #22
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Should I still get the sea foam and put it in the tank?
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Old 06-18-2012, 12:07 AM   #23
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I have had the same issue with my 2011. I have taken it to the dealership numerous times. I have tries seafoam, fuel injector cleaner, octane boosters and 91 octane. 91 octane is the only thing I have found that helps. I spoke to a trustworthy Jeep mechanic. He said almost all of them he 2011 have the same issue. He said run higher octane. I told him manual says 87. He said its about money. Chrysler doesn't want to tell people that they will have to pay more for gas and want to sell there vehicles. Chrysler can fix the issue but it needs to get he EPA to pass it. As if now they are to busy with the problems that the 2012 are having. Long story longer it can't be fixed until more people complain to Chrysler.

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