Wrangler Rubicon JLU 3.6 engine pre-detonation

[Hau82]

UPDATE!!!!

So I finally took my JLUR to the dealership yesterday with a recorded audio of the misfiring, technician couldn’t reproduce the misfire so he plugged the computer in the obd port and took it for another test drive, when he got back, he told me the cylinder 1 was misfiring and he had to replace the coil and spark plug. It’s been day 1 and apparently the problem it’s gone. I’ll give it a few more days to be 100% sure it doesn't come back!!

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[viper88]

So I pick up my jeep from the dealer manager and tech could hear the noise but cant locate it or know what the noise is. So I contacted FCA and opened a case. There was also some clicking noise when I turned left well they found CV shaft but was loose the upper and lower ball joints were loose and the drivers outer tie rode was also loose. All from factory

Unreal all those components were loose. WTF are they doing at the factory? Thankfully they actually found the loose parts before anyone got hurt. Hopefully all is good now!

 

[viper88]

UPDATE!!!!

So I finally took my JLUR to the dealership yesterday with a recorded audio of the misfiring, technician couldn’t reproduce the misfire so he plugged the computer in the obd port and took it for another test drive, when he got back, he told me the cylinder 1 was misfiring and he had to replace the coil and spark plug. It’s been day 1 and apparently the problem it’s gone. I’ll give it a few more days to be 100% sure it doesn't come back!!

Great to hear the tech was qualified.

 

[Rudedawg]

Dealer was able to hear “pre-ignition” and opened a case. Will let you know what i hear back. Anyone else out there with the same problem?

 

[iflyimpilot]

UPDATE!!!!

So I finally took my JLUR to the dealership yesterday with a recorded audio of the misfiring, technician couldn’t reproduce the misfire so he plugged the computer in the obd port and took it for another test drive, when he got back, he told me the cylinder 1 was misfiring and he had to replace the coil and spark plug. It’s been day 1 and apparently the problem it’s gone. I’ll give it a few more days to be 100% sure it doesn't come back!!

Hey OP,

Thanks for the update with regards to how your JL was after the dealership visit! Now, almost 2 months later, has the pinging/knocking come back at all?

 

[ledzeppelin1977]

Bump this thread

OP - did that fix work for you?

 

[JMONEZ]

I’ve been having the same problem( only 9k), seems more like a diesel rattle noise, I’ll try and upload some clips I took with GoPro. Dealer heard it too but can’t find what’s causing it, going back to dealer tomorrow for rear diff repairs, drag link, and seat track along with more diagnostics, hopefully someone can figure this noise out. 91 octane hasn’t affected mine. There are other post about engine rattle on accel that describe exact same symptoms.

 

[iflyimpilot]

Here’s a 1min GoPro video capturing the rattle knocking noise mine makes under load 2 or 3 gear. I’m dropping off to dealer again in 1 hour, we’ll see what happens?

Not sure I'm hearing it in the video, maybe around the :15-:16 second mark?

 

[Torero]

Here’s a 1min GoPro video capturing the rattle knocking noise mine makes under load 2 or 3 gear. I’m dropping off to dealer again in 1 hour, we’ll see what happens?

This is misleading because of the title of the thread. That’s anything but engine knocking.

 

[JMONEZ]

Here’s another clip, can you hear the rattle sound?

 

[JMONEZ]

This is misleading because of the title of the thread. That’s anything but engine knocking.

I didn’t start the thread but can certainly relate to the concern and symptoms people are having and describing with same conditions(2 or 3 gear acceleration under load)

 

[Torero]

I didn’t start the thread but can certainly relate to the concern and symptoms people are having and describing with same conditions(2 or 3 gear acceleration under load)

I understand the concern. I am not saying there is no issue, but maybe it should be on its own thread because that is not engine knocking. Something is clicking for sure, but engine knocking is used for a more specific issue. I am not downplaying your problem.

 

[JMONEZ]

I understand the concern. I am not saying there is no issue, but maybe it should be on its own thread because that is not engine knocking. Something is clicking for sure, but engine knocking is used for a more specific issue. I am not downplaying your problem.

Just an FYI, It’s also on another thread labeled rattle on acceleration, that’s how I describe it, but I can appreciate folks describing as a knocking sound, but it’s obviously not an engine knock! I’m just hoping one of us can finally get some answers in relation to the (rattle, pinging, knocking, ticking, rapid clicking, gargeling, bogging, pre-detenation, spark knocking, diesel rattling sound.

 

[JMONEZ]

UPDATE!!!!

So I finally took my JLUR to the dealership yesterday with a recorded audio of the misfiring, technician couldn’t reproduce the misfire so he plugged the computer in the obd port and took it for another test drive, when he got back, he told me the cylinder 1 was misfiring and he had to replace the coil and spark plug. It’s been day 1 and apparently the problem it’s gone. I’ll give it a few more days to be 100% sure it doesn't come back!!

Were there any codes or check engine light on? How’s it been now since repair, any more noise?

 

[Jeepmarkjl]

I had something similar to this. sounded like a mechanical flutter for 2-3 seconds under acceleration - its in addition to the normal engine growl. I switched to 93 octane as an experiment to see if that had any effect. So far now for 3 days Ive not heard the same flutter. Fingers crossed. However, the Jeep shouldn't "flutter" with 87 octane. So I'll be taking it in to dealer at some point here too.

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