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I've noticed on steep inclines at low speed my 2017 Jeep JKU makes a clicky pinging sound. Seems to be when the engine is loaded and the Jeep doesn't downshift. Worried it's engine pinging/preignition.

Running 87 octane with 16k miles on the 3.6l engine.


Here's a short video. Hard to get on a phone, but you can hear it if you turn the volume up.

https://youtu.be/srdrVUoU2Ms
 

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Could be... could be an exhaust leak... easy test is to use higher octane, or dump a canoe boost in the tank and see if you get the same results in similar conditions...
 

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I've noticed on steep inclines at low speed my 2017 Jeep JKU makes a clicky pinging sound. Seems to be when the engine is loaded and the Jeep doesn't downshift. Worried it's engine pinging/preignition.

Running 87 octane with 16k miles on the 3.6l engine.


Here's a short video. Hard to get on a phone, but you can hear it if you turn the volume up.

https://youtu.be/srdrVUoU2Ms
Hi Murphys_Law,
We are sorry to hear of this concern you have been experiencing. Our team recommends reaching out to your dealership for additional insight. If you would like an additional layer of assistance during this, please send us a private message.
Jenn
Jeep Social Care Specialist
 

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I've noticed on steep inclines at low speed my 2017 Jeep JKU makes a clicky pinging sound. Seems to be when the engine is loaded and the Jeep doesn't downshift. Worried it's engine pinging/preignition.

Running 87 octane with 16k miles on the 3.6l engine.


Here's a short video. Hard to get on a phone, but you can hear it if you turn the volume up.

https://youtu.be/srdrVUoU2Ms
Any updates? Do you have a manual or auto? Did running higher grade fuel help or change?
 

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Discussion Starter #5
I've noticed on steep inclines at low speed my 2017 Jeep JKU makes a clicky pinging sound. Seems to be when the engine is loaded and the Jeep doesn't downshift. Worried it's engine pinging/preignition.

Running 87 octane with 16k miles on the 3.6l engine.


Here's a short video. Hard to get on a phone, but you can hear it if you turn the volume up.

https://youtu.be/srdrVUoU2Ms
Any updates? Do you have a manual or auto? Did running higher grade fuel help or change?
I took it to the dealer and they said yep it's knocking/pinging, no we can't do anything, they all do it to some degree. It's even mentioned in the manual as "light knocking" is normal. I've been running higher octane to compensate for the pinging. 89 solves ~80% and 93 it's gone. Expensive fuel to run on a low mpg vehicle haha.

Contemplating running 87 anyway, because 93 is about $800 more in gas per year for me. If it makes it 5 years and blows up, I could buy a new engine with the amount saved.
 

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Mine build dec 17 is pinging also on 87, switched to 91 in may.
Just wandering, is yours 3.21 axle Auto Trans?
 

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Mine build dec 17 is pinging also on 87, switched to 91 in may.
Just wandering, is yours 3.21 axle Auto Trans?
Yeah seems pretty common. I don't like any pinging even if the manual says "expected" ....I also expect to get more than 100k miles out of my engine 🙂 I'm running the stock 32s on 3.73 gears for now.
 

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I agree, "pinging" is actually "gas detonation" which is actually a mini explosion inside the cylinder with all destructive factors of an explosion including temperature and shockwave. Over time even slight pinging will substantially decrease the life of any motor.
 

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See the following thread. My post was regarding the 3.8L but this seems to be a common issue with both the 3.6L and 3.8L engine.

https://www.wranglerforum.com/f202/pinging-on-regular-gas-under-load-2363941.html

I have already tried changing the gas station from which I get gas to no effect. I've also tried ethanol-free 89-octane gas with only a small observed improvement.

I am currently running higher octane gas which fully eliminates the issue and, in the order in which I will try them, will be doing the following:

-Replace radiator thermostat. Someone suggested the engine could be running slightly hot and a new thermostat is the cheapest place to start.
-Replace spark plugs. Next cheapest solution and one that is soon due for me anyways.
-Replace spark plug wires.
-Run gas treatment for a few tanks and Seafoam to address "any carbon build up".


Very disappointed that this is a common problem. Premium gas is upwards of $3.50 in my area.
 

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My 2015 will ping with 89 octane. I fill up when the gas gauge reads a little under 1/2 tank. I alternate fill ups with 89, then 91 octane. Works great.
 

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I've got an auto transmission JK built in Aug/2016. I bought it new. I've put on just over 18,000 miles so far and it's never pinged. I only use 87 gas.
 

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I've got an auto transmission JK built in Aug/2016. I bought it new. I've put on just over 18,000 miles so far and it's never pinged. I only use 87 gas.
I think it has something to do with axle ratio, 3.73 and 4.01 are probably less prone to pinging, also it might be that later models have some sort of eco friendly ECM update.
I wouldn't say mine isn't drivable on regular at all but it pings under load, not very loud but noticeable, which is still very irritating and not healthy for the motor.
By switching to manual shift I can avoid pinging by downshifting to higher rpm band. However I prefer 91 it drives much better, and I don't have to downshift manually.
 

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Our two JK Recons, 2 door with 13k and unlimited with 20k this week, I have never heard any pinging or pre-ignition, in anyway. When I put the 4.0 in my '87 YJ, it did ping on 87 octane so I ran 89 each and every time. This eliminated any and all pinging.

Since the STEALERSHIP is trying to wash their hands of it, I would see if there is an aftermarket tuner that can re-tune it back to 87 octane and stop the pinging. DON'T JUST TURN UP THE RADIO like the dealership is telling you to. It will ruin your engine!!! At least, run 89 octane until you can re-tune it back to 87.
 

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Im not blaming the jeep or at list not 100% it could be the gas quality (Costco)
today I fueled with regular, added half a tank which makes it sort of 89, but the jeep sort of likes it, no pings or anything :)it drives like I added 93 and not 87.
It could be that Costco gas quality fluctuates and im trying to chase a non existing issue.
At next fuel up I will have mostly regular in the tank will see how it drives.
 

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I've also noticed intermittent pinging in my '17 JKUR (4.88 gears, 315's and manual trans). It is not all the time - it seems most common when it is warm out and I'm climbing any sort of hill <3,000 rpms. It basically means that I have to maintain a low enough speed to keep it between 3,000 and 4,000 rpms while going up hills (no up-shifting) or I have to run 89 octane. I have not isolated all the variables yet (which gas station, outside temp, etc) but it definitely pings.
 
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