Low-Speed Engine Rattle

[intentsrig]

Hey I need to know this fix, how do I find out. I’m living with this pinging and worried about long term.

Only time I didn’t have pinging was by running 91.

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[Shellbird01]

I’ve run 91 as well, it still pings when it’s warm out

 

[azjl#3]

try low viscosity oil modifier from lucas, something like $10. Cheap try.

 

[kneedragger]

I will be posting the solution in that other "banned wrangler forum", as soon as I return to home base and have access to a larger screen with proper keyboard, so keep an eye for it there ?.

Can you PM me a link to that fix if it was ever posted.

 

[Shellbird01]

Ditto

 

[Shellbird01]

Is it one of those “I traded for a 392 or a Bronco”? Lol

 

[AdamHI]

Same problem, 2020 Jeep JLU 3.6. Engine rattle at low RPMs usually between 1,000 and 2,000. Only have 15,000 mi and most of everyone always says check for loose bolts, manifold leaks, etc. but none of that seems to work. Has anybody at all tried octane boost. I've tried higher octane fuel but really don't notice a difference. I'm more interested in hearing any resolutions to this engine knock problem. If you know you know. It's not rocks or anything else it's coming from the engine 100%. Please add all comments below. Thank you.

 

[Byrds8]

I believe there is a TSB for this.

https://www.jlwranglerforums.com/fo...r-3-6-for-spark-knock-and-misfire-cel.108824/

 

[Kariduro88]

I believe there is a TSB for this.

https://www.jlwranglerforums.com/fo...r-3-6-for-spark-knock-and-misfire-cel.108824/

Not it. On that case Jeep was running rough and had check engine codes. Mine has had it since almost new haven’t get what the problem is yet.

 

[Shellbird01]

Not it. On that case Jeep was running rough and had check engine codes. Mine has had it since almost new haven’t get what the problem is yet.

What year?

 

[Kariduro88]

What year?

2019

 

[Shellbird01]

My 2018 PCV allowed excess oil carryover to the combustion chambers resulting in carbon buildup. The change in combustion area with the increased compression in the PUG upgrade created detonation / pre ignition knock.

The new PCV is shown in the attached TSB. The TSB is extensive, it involves pulling the heads, I also hear some are using a BG 44 treatment, some using a heavier weight oil and so on.

My knock was at ~70 F in low 3rd gear.

 

[roaniecowpony]

In addition to that change of the PCV valve, the following information might be helpful. The Valvoline Restore & Protect is also API-SP rated for LSPI (Low Speed Pre-Ignition) protection. Regardless of what else is done, I wouldn't bother running any oil that isn't API-SP rated.

 

[autotragic]

In addition to that change of the PCV valve, the following information might be helpful. The Valvoline Restore & Protect is also API-SP rated for LSPI (Low Speed Pre-Ignition) protection. Regardless of what else is done, I wouldn't bother running any oil that isn't API-SP rated.

So apparently API-SQ is coming out this spring and the reason is to address LSPI. I guess some oils that pass when new aren't passing after so many miles so the reason for SQ was to ensure that oils that only pass when new will no longer pass to carry the latest certification. Good stuff.

 

[roaniecowpony]

So apparently API-SQ is coming out this spring and the reason is to address LSPI. I guess some oils that pass when new aren't passing after so many miles so the reason for SQ was to ensure that oils that only pass when new will no longer pass to carry the latest certification. Good stuff.

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