Rattles during acceleration

Mike Pierson

Mike Pierson

Hooked
Hey folks,

2021 JLUR, 3.6L, 8spd, 5.13, 37s

A few weeks ago I started to notice a rattle during accelerating while shifting through 3rd and fourth. It occurs during light acceleration and under load, especially when climbing even the smallest of hills. It’s like one heavy rattle with a few quieter ones ad then stops. I’m pretty sure the noise is coming from the engine and It sounds like engine knock to me.

Any of you JL or JT folks have, or had, this?

Thanks!
 
My JL had light what I would describe as "spark knock" but I am not sure how bad it was in relation to yours, I moved up to 89 octane and it went away. I chalked it up to the shit tune they put on these Pentastar engines to get more MPG's. As soon as I escape California this thing is getting an aftermarket tune.
 
JimLee said:
My JL had light what I would describe as "spark knock" but I am not sure how bad it was in relation to yours, I moved up to 89 octane and it went away. I chalked it up to the shit tune they put on these Pentastar engines to get more MPG's. As soon as I escape California this thing is getting an aftermarket tune.
Click to expand...
Thanks, that’s what it sounds like to me as well. What’s odd is that I have nearly 23k miles and I’ve only started hearing this a couple weeks ago. Maybe it’s the new shit gas we have in California?

I guess that I’ll try the 89 octane… I shouldn’t have to do that though. Kaching
 
Mike Pierson said:
Thanks, that’s what it sounds like to me as well. What’s odd is that I have nearly 23k miles and I’ve only started hearing this a couple weeks ago. Maybe it’s the new shit gas we have in California?

I guess that I’ll try the 89 octane… I shouldn’t have to do that though. Kaching
Click to expand...
You could take it by the dealer, but from what I've seen on other forums the answer always seems to be "that's normal". Mine didn't really getting noticeable until about 10k or so. Yea, my mileage changes twice a year based on what shit gas is currently being forced on us.
 
JimLee said:
You could take it by the dealer, but from what I've seen on other forums the answer always seems to be "that's normal". Mine didn't really getting noticeable until about 10k or so. Yea, my mileage changes twice a year based on what shit gas is currently being forced on us.
Click to expand...
Thanks for the help! I’ll try the 89 and monitor it. If it continues then I’ll try the stealership route.
 
Mike Pierson said:
@JimLee, The good news is that you were right, 89 octane cleared up the knock. The bad news is now I’m complaining even more about my fuel bill. 🤨 lol
Click to expand...
Sorry, took the wife camping for a few days. Happy to hear that it isn't something serious, I hear you on the fuel costs, i cant believe I was all excited to only pay 4.53 a gallon in Utah this week.
 
You must log in or register to reply here.
Top Bottom