Rattling upon acceleration

[JeepCares]

Hi @opiop,

We're sincerely sorry to learn of these concerns that you have with your Jeep Wrangler. Please send our team a private message with your VIN, mileage, and dealer so that we can look into this further and have it documented on your behalf.

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[traxtion]

Took my Jeep out for two hours today and I think I have a workable solution to avoid the sound. This is not a complete solution - FCA still needs to update the tuning. However, it does limit the noise and may preserve your sanity.
The trick is to make sure that every shift drops the tachometer needle to at or just above 2000 rpms. Any lower and you will risk slightly lugging the engine and confusing the computer, causing the knock. Engines should not knock when slightly lugged, but it seems possible that early shifts into low RPMs from high RPMs leave the engine scrambling to adjust the tuning to maximize power over efficiency.

For me, this means shifting into 2nd at 3300 rpms, and into 3rd at 3000 rpms. I then follow the instruction manual’s instruction to continue in 3rd until 50 mph when accelerating.

Consistently driving like this took lots of practice. I have been daily driving manuals my entire life and have never experienced such bizarre gearing. I’m hoping my eventual re-gear to 4.56 will resolve this issue long term.

Hope others find this helpful.

 

[thiskneeguy]

Took my Jeep out for two hours today and I think I have a workable solution to avoid the sound. This is not a complete solution - FCA still needs to update the tuning. However, it does limit the noise and may preserve your sanity.
The trick is to make sure that every shift drops the tachometer needle to at or just above 2000 rpms. Any lower and you will risk slightly lugging the engine and confusing the computer, causing the knock. Engines should not knock when slightly lugged, but it seems possible that early shifts into low RPMs from high RPMs leave the engine scrambling to adjust the tuning to maximize power over efficiency.

For me, this means shifting into 2nd at 3300 rpms, and into 3rd at 3000 rpms. I then follow the instruction manual’s instruction to continue in 3rd until 50 mph when accelerating.

Consistently driving like this took lots of practice. I have been daily driving manuals my entire life and have never experienced such bizarre gearing. I’m hoping my eventual re-gear to 4.56 will resolve this issue long term.

Hope others find this helpful.

Hmmm so never drop the RPM below 2000 when shifting? I don't exactly view that as a solution. Any advice for the 8-speeds that also have this rattle?

 

[ThirtyOne]

Took my Jeep out for two hours today and I think I have a workable solution to avoid the sound. This is not a complete solution - FCA still needs to update the tuning. However, it does limit the noise and may preserve your sanity.
The trick is to make sure that every shift drops the tachometer needle to at or just above 2000 rpms. Any lower and you will risk slightly lugging the engine and confusing the computer, causing the knock. Engines should not knock when slightly lugged, but it seems possible that early shifts into low RPMs from high RPMs leave the engine scrambling to adjust the tuning to maximize power over efficiency.

For me, this means shifting into 2nd at 3300 rpms, and into 3rd at 3000 rpms. I then follow the instruction manual’s instruction to continue in 3rd until 50 mph when accelerating.

Consistently driving like this took lots of practice. I have been daily driving manuals my entire life and have never experienced such bizarre gearing. I’m hoping my eventual re-gear to 4.56 will resolve this issue long term.

Hope others find this helpful.

Yep. We have been recommending this on all the manual threads. It took me a while to figure it out. Doesn’t feel natural at first but you adjust.

 

[DougJaneway]

It'll probably catch on fire eventually like Ferrari engines too because it's not tuned properly

 

[Spiffypina]

Someone should make a petition to sign for this so they can actually see its a real problem and not an imaginary thing.

 

[DougJaneway]

Someone should make a petition to sign for this so they can actually see its a real problem and not an imaginary thing.

Until some of us get some serious miles on the engines where we can see if it actually affects anything, they're not going to do anything. My guess is issues won't appear until the 85k-100k mileage range if its doing damage.

 

[Spiffypina]

Until some of us get some serious miles on the engines where we can see if it actually affects anything, they're not going to do anything. My guess is issues won't appear until the 85k-100k mileage range if its doing damage.

My jeep is at 46k right now but I havent noticed any damage

 

[traxtion]

Has anyone considered an issue with the EGR valve?

 

[DougJaneway]

Has anyone considered an issue with the EGR valve?

Yeah, someone had theirs replaced earlier in the thread and it didn't do anything. Neither does a catch can.

 

[traxtion]

Yeah, someone had theirs replaced earlier in the thread and it didn't do anything. Neither does a catch can.

Scrolled through the thread and I found an example of someone replacing a PCV valve but no mention of EGR. They have similar functions but are ultimately different. Both can cause spark knock, although EGR is a more likely culprit. Please let me know if you have tried this method.

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