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Topic Review (Newest First)
12-02-2013 05:27 PM
BennyB I have a 2012 with the same noise everyone is hearing. Odd thing is, mine does not make noise until it warms up and the noise gets louder with increase in rpm. Also sounds like a single rocker etc.?? Taking it in on Thursday, did not get a warm and fussy from the service manager. I recently bought it with 23,000 miles.
05-08-2012 10:02 AM
Djstorm100 There are tensioners so there is so slack in the chain, the chain it self has followers or a guide rail that is pushed on by the tensioner
01-02-2012 01:47 PM
Silverton34 I'm kind of surprised none of you think that the six plus feet of chain right under the front surface of the engine just might be making some noise.
01-02-2012 01:36 PM
ranjr
Quote:
Originally Posted by JKWrangler2012

automatic, huh?

...see that green bar in your tachometer that runs from 1k-2.5?? ...about 2.5k RPM is exactly when my "ECO ON" light shuts off. [no mater which of the 6 gears i'm in] .which makes MPG sense... but certainly doesn't require shifting by then.
Yes, it's an auto.

I run more than 2.5K at 70 so my ECO light would never be on if it did like yours.
01-02-2012 01:20 PM
JKWrangler2012
Quote:
Originally Posted by ranjr View Post
ECO doesn't stop at 2.5K, here's a pic of me running 80mph with it on.

Attachment 86605
automatic, huh?

...see that green bar in your tachometer that runs from 1k-2.5?? ...about 2.5k RPM is exactly when my "ECO ON" light shuts off. [no mater which of the 6 gears i'm in] .which makes MPG sense... but certainly doesn't require shifting by then.
12-31-2011 03:06 PM
ranjr
Quote:
Originally Posted by JKWrangler2012
"eco" may stop at 2.5k... but i usually switch at 3k or after.
ECO doesn't stop at 2.5K, here's a pic of me running 80mph with it on.

Attachment 86605
12-31-2011 01:58 PM
JKWrangler2012
Quote:
Originally Posted by dwindeck View Post
I also got to thinking how going from cast exhaust manifolds to headers changes the sound to a kind of tiny sound, could the new manifold-less exhaust be creating this sound effect?
it's gotta be.

[side note] it's been an unusually warm December. which sucks because i want it to snow.. but with the windows open more i can hear the exhaust more ...which sounds great...and that other noise less, also great! -my little race Jeep

i feel the 3.21 gears like to be held in gear to a higher RPM... "eco" may stop at 2.5k... but i usually switch at 3k or after. i've never driven one with 3.23's or 4.10's.. but my JK usually always needs 1st gear. i bet 2nd gear pull outs are more common in the "lower" gearing rigs?
12-31-2011 01:26 PM
mcrodney
Quote:
Originally Posted by redrockman
Have a slight frequency related engine rattle at start up then goes away with rpm increase. Hood on my Sahara is insulated. Going to change oil soon. 749 miles on it now.
That sounds like lifter rattle. This happens until the oil is in the top to lubricate.
12-31-2011 10:33 AM
redrockman Have a slight frequency related engine rattle at start up then goes away with rpm increase. Hood on my Sahara is insulated. Going to change oil soon. 749 miles on it now.
12-31-2011 10:24 AM
dwindeck I also got to thinking how going from cast exhaust manifolds to headers changes the sound to a kind of tiny sound, could the new manifold-less exhaust be creating this sound effect?
12-31-2011 02:03 AM
mcrodney I have an srt 10 quad cab. My second. The injectors are so loud everyone including Chrysler mechanics that have never heard them think it's engine noise. A simple scope can pinpoint where the noise is coming from.
12-30-2011 09:44 AM
j.luis if that sounds like a bad engine it sounds just like mine. i love mine though.
Let me know if jeep is buying back all the Jeeps with the Pentastar engine.
IMO, I think modifying the exhaust loop will help with the problem...
12-29-2011 06:25 PM
JPi1
Quote:
Originally Posted by JKWrangler2012
does anyone have any fancy pentastar intake/exhaust motor-head images?

i gotta get this figured out in my head.
Google Pentastar
12-29-2011 05:46 PM
JKWrangler2012 does anyone have any fancy pentastar intake/exhaust motor-head images?

i gotta get this figured out in my head.

[i wonder if my acceleration exhaust-leak-esque, sometimes-noise, is related to this design feature. it doesn't sound "broken"... but i've never herd this kinda noise before]
12-25-2011 04:24 PM
clogan
Quote:
Originally Posted by 2012-Rubicon View Post
Yup, my Trans am with the LS sounded like that too!
My vette has the 7 liter engine, and it ticks a good bit as well. I confess: I sorta like the sound.

CL
12-25-2011 03:18 PM
Riggsie
Quote:
Originally Posted by Kelsey73 View Post
Huh? I'd worry more, but it's done that from day one. If the engine fails out of warranty I'll have a spare 6.1L soon.....
Mine was silent until 2600 miles. Our new 2012 is silent compared to the one we traded in. Going to put Max Care on it and Jeep it! I posted the video so people could compare. Most new ones are very quiet and this is one of Chrysler's selling points.
12-25-2011 01:46 PM
Kelsey73
Quote:
Originally Posted by Overtrained View Post
Changed the oil on my 2012 jeep for the first time @ 2300 miles. The valvetrain and injectors are noisy but nothin I'm to concerned about. Mobil 1 synthetic seemed to help. When it blows up the dealer will get a call, until then, happy jeeping!

Very well said. It's a jeep!!
12-25-2011 01:36 PM
Overtrained Changed the oil on my 2012 jeep for the first time @ 2300 miles. The valvetrain and injectors are noisy but nothin I'm to concerned about. Mobil 1 synthetic seemed to help. When it blows up the dealer will get a call, until then, happy jeeping!
12-25-2011 01:18 PM
Kelsey73
Quote:
Originally Posted by Snailpower View Post
I have heard some with it and some without. No rhyme or reason to it. If you had both my van hood and Jeep hood open, and both sitting side by side, you wouldn't believe they are the same engine.

Huh? I'd worry more, but it's done that from day one. If the engine fails out of warranty I'll have a spare 6.1L soon.....
12-25-2011 01:11 PM
Snailpower I have heard some with it and some without. No rhyme or reason to it. If you had both my van hood and Jeep hood open, and both sitting side by side, you wouldn't believe they are the same engine.
12-25-2011 12:58 PM
Kelsey73
Quote:
Originally Posted by Snailpower
That sound is not normal in the 3.6. My Town and Country is so quiet with the hood open, I swear I could set a metronome to the injectors. Same engine. My Jeep sounds like a 225 slant with 150K on it at times.
That tick sound? Im not sure on the other 3.6L applications, but the other wrangler we drove sounded the same as that video. Same as mine does now.
12-25-2011 12:19 PM
Snailpower That sound is not normal in the 3.6. My Town and Country is so quiet with the hood open, I swear I could set a metronome to the injectors. Same engine. My Jeep sounds like a 225 slant with 150K on it at times.
12-24-2011 09:28 PM
Kelsey73
Quote:
Originally Posted by Ballandchain
That doesn't sound bad. You should hear the lifters on a MINI. Sounds like a diesel.....
Funny you say that. Sometimes I think that about my JKU
12-24-2011 09:27 PM
Ballandchain That doesn't sound bad. You should hear the lifters on a MINI. Sounds like a diesel.....
12-24-2011 09:20 PM
JPi1
Quote:
Originally Posted by 2012-Rubicon

It's probably rocker noise most people just call valvetrain noise "lifter noise" wheather it is or not......now try telling me ohc engines don't have rockers...
They have hydraulic "lifters", that can make noise like any other engine. The lifter is at the end of the rocker, opposite of the valve spring end, in the head.
12-24-2011 09:05 PM
Kelsey73
Quote:
Originally Posted by Riggsie
Definitely not normal. Engine was as quiet as can be until 2600 miles or so. It was even louder before I traded it off. The video was made with my iPhone. When I have time I will post a video shot in the same manner with the 12 JKUR I traded the noisy one for.
Sounds like mine. It's sounded like that from day one.
12-24-2011 09:00 PM
Riggsie Definitely not normal. Engine was as quiet as can be until 2600 miles or so. It was even louder before I traded it off. The video was made with my iPhone. When I have time I will post a video shot in the same manner with the 12 JKUR I traded the noisy one for.
12-24-2011 08:42 PM
Kelsey73
Quote:
Originally Posted by Riggsie
Here is a link of a Youtube video of my Cosmos JKUR and the noise it was making. You can really hear the noise when I move the camera down by the exhaust. Pentastar engine noise 2012 - YouTube
Sounds normal to me.
12-24-2011 08:37 PM
Riggsie Here is a link of a Youtube video of my Cosmos JKUR and the noise it was making. You can really hear the noise when I move the camera down by the exhaust. Pentastar engine noise 2012 - YouTube
12-24-2011 06:54 PM
JKWrangler2012
Quote:
Originally Posted by Riggsie View Post
To me it sounds more like an exhaust leak, but it could be lifter related too.
when the rig is warmed up... and sometimes when i'm basically flooring it till about 5k... there's occasionally a rattling/ticking/exhaust-leak/something in the glove box kind of noise...

it's weird... but doesn't alarm me. i wonder if the loop in the exhaust plays a factor?
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