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Unread 08-23-2012, 08:50 AM   #1
Dale_K
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My 2012 pings up steep hills. Is there a reflash to fix?

I have the base model 2012 with the manual trans, 3.73 gears and I live in a hilly community. On steep hills I get a pretty strong pinging from the motor and I think it's getting worse. The typical situation is 1,900 to 2,300 rpm with about 1/3 throttle in 3rd and 4th gear. At first I tried just going from 4th to 3rd and that does raise the rpm but it still pings about the same. Yesterday I filled up with 89 octane and that didn't seem to make any difference at all. Funny thing is on a different steeper and longer hill I don't get any ping at 2,300 in 4th at full throttle. The hill where the pinging is worse doesn't require full throttle but the curves limit how fast I can go so I can't just charge up it.

It's like the engine computer doesn't have a good map for part throttle, moderate load, moderate rpm. It's not reacting to the knock sensor or can't pull timing or maybe can't move the cam phasers enough to correct. At least that's my theory. I was hoping there might be a reflash. I know there's one for the head problem (that never works to prevent head failure) and I don't know if that reflash might do some good for my situation. I don't have the ticking or CEL issues on mine.

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Unread 08-23-2012, 08:54 AM   #2
gonwhln
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process of elimination:

not using low octane fuel?
Superchips or programmer installed?
Large tires with no regear?
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Unread 08-23-2012, 09:54 AM   #3
jstrubberg
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The first issue would be a steep hill at 2k rpm. You are dogigng that engine hard.
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Unread 08-23-2012, 01:13 PM   #4
jwmbishop
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Your theory is real strong Dale. I would get it in to the dealer asap and see if you have a bad knock sensor or something. It should not ping at all regardless of load, octane or steepness of hill.
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Unread 08-23-2012, 02:56 PM   #5
muddr1
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Exacly what jwm said. There are knock sensors on the engine, it should not ping at all uless you got some really bad gas. if it still does it with gas from a different station, I would take it to the dealer.
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Unread 08-23-2012, 03:35 PM   #6
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Sure it's not the trans ? My trans rattles and it sounds identical to engine pinging.
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Unread 08-23-2012, 08:15 PM   #7
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This is good info. I have a 2008 with 33s and 85k. It pings a bit, but if I put 89 octane gas in, it goes away. I'll need to look into the knock sensor.
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Unread 08-24-2012, 08:48 AM   #8
Dale_K
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I guess I'll take it in. I realize that you can make almost any engine ping if you're lugging it but I drive several other manual trans vehicles on the same roads and they don't ping. I feel like I'm driving them about the same. The other reason I don't think I'm lugging it is the Jeeps is able to maintain pace and even accellerate a little while it's pinging. I don't know what the reflash for the head failure does but since Jeep is blaming those on a combination of fuel quality and driving patterns maybe it does something that might help my pinging problem.

I expect to be frustrated when I take it in since they won't be able to duplicate it in an area of flat terrain, which is the situation near the dealership.
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Unread 08-24-2012, 07:02 PM   #9
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Keep us updated Dale
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Unread 08-24-2012, 07:49 PM   #10
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does it sound like there is a rock floating around in the bottom of a barrel? thats your 6-speed. they ALL rattle since 2005.
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Unread 10-13-2012, 06:15 AM   #11
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A little update - there has finally been some cool weather here in Arkansas and the pinging totally stops when the temperature gets down around 60. I was really surprised by the huge difference in the way my Jeep runs. I was able to drive up hills where the pinging was bad and even at 2000 rpm there is no pinging at all. I really want to get the 3.6 reflash that came out with the head failures but I haven't talked to the dealer about it yet. I suspect the 3.6 would benefit from a lower temperature thermostat, too.
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Unread 10-13-2012, 06:30 AM   #12
jeepnie87
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Quote:
Originally Posted by spyder6
does it sound like there is a rock floating around in the bottom of a barrel? thats your 6-speed. they ALL rattle since 2005.
I've definitely noticed this on mine. Has there been any issue with this that you know of, or is that just the way it is? Thanks
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Unread 10-13-2012, 04:00 PM   #13
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just the way it is
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Unread 05-05-2013, 10:12 PM   #14
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Quote:
Originally Posted by Dale_K View Post
A little update - there has finally been some cool weather here in Arkansas and the pinging totally stops when the temperature gets down around 60. I was really surprised by the huge difference in the way my Jeep runs. I was able to drive up hills where the pinging was bad and even at 2000 rpm there is no pinging at all. I really want to get the 3.6 reflash that came out with the head failures but I haven't talked to the dealer about it yet. I suspect the 3.6 would benefit from a lower temperature thermostat, too.
Dale - are you having the same problem now that the outside temps are going up again? I am having the same problem now that it is getting warmer outside.

Or did you find a solution?
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Unread 05-06-2013, 08:53 AM   #15
222Doc
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the reflash I think is cover up to delay the need for Jeep to replace the head. a software fix for a mechanical flaw.

The ping if not corrected with 89. Might well be sign of the valve going out in #2.

One thing I have not heard from at least found a post related. I might just go to my trusted mechanic I use for things I can not do. I do not trust the dealers. Have #2 checked with, leak down test or even a scope camera to see how that seat looks. Jeep is hidding this issue like the Goverment is Benghazi.

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