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Old 05-08-2009, 08:35 PM   #1
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Rattle under load

I just bought a 09 Wrangler X 6 speed and I'm just curious about something. Whenever I have the engine under load there appears to be a rattling or vibrating sound that seems to come from the engine or the drivetrain. Is that normal for JKs? It is really noticeable with the top off or with the drivers side window down. It seems like it comes from the drivers side of the vehicle. I had a C5 Corvette and it made a similar sound because of the torque tube.

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Old 05-09-2009, 08:39 AM   #2
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I would get that sucker to the dealership and see what's up.
You sure it's not the tube steps? Mark W.

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Old 05-09-2009, 09:37 AM   #3
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LOL...No I know the tube steps are firmly bolted in place. I don't think it's worth going to the dealer for at this point. I was just curious if others have noticed it. I think it is just engine or drivetrain noise.
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Old 05-09-2009, 11:05 AM   #4
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Does the rattle go away if you down shift? Maybe you are just lugging her a bit?
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Old 05-09-2009, 01:04 PM   #5
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Agreed- keep it over 1800, 2000 RPM's or you're going to be lugging it. Also, take it in to a dealership- better to solve a small problem now than to have a bigger one down the road! Mark W.
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Old 05-09-2009, 01:25 PM   #6
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So Mark, where would you recommend the rpm's should be for up shifting. I've been shifting up around 2000, 2200. Miles/gal have been good, but I thought I may be shifting too early. The OM only has mph shift points, too many to remember. I've been down shifting around 1700. Curious to what you have to say on this.

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Old 05-09-2009, 02:46 PM   #7
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Upshifting at 2,000?! I hope that's a typo and you mean three! Yikes I shift around 3 grand from 1st through 4th. I have 33's on 3.73's, though, so I need more revs to keep the poke up. 2500 into 5th and 6th.
With the OEM 29's and 3.73's, maybe as low as 2700 going from 1st through 4, and 2400 5th and 6th.
It really depends on your gearing vs. tire size- Mark W.
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Old 05-09-2009, 02:52 PM   #8
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I am probably shifting too low. I will try shifting it at 3k rpm. I have noticed that it makes less noise if I shift it higher. When you are "lugging" does it sound kind of like a diesel? That is the sound that it makes.
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Old 05-09-2009, 02:56 PM   #9
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My two cents:

I'm a life long standard owner and used to worry about when to shift. I never look at the owners manual on this subject.

To be thrifty on gas be in the highest gear possible without bogging down. I'm in 6th at about 35 to 40 on flat surfaces.

Passing or whenever you need torque shift into a gear the puts you into the mid part of the power band in rpms. I never look at my tach when doing this. It is simple, keep down shifting until when you git on it it responds with gusto. After a while, this will become almost automatic. When I am in thrifty mode I usually down shift at least two gears and sometimes three when I am about to get aggressive on the accelerator.

When starting on flat surfaces I shift early unless I'm being agressive, down hill I shift real early sometimes skipping gears and uphill I shift late. When I am being agressive and intend to return to passive mode (thrifty) I upshift a couple of gears at a time and sometimes 3 gears.

When I am in a situation when I'm not sure what gear to be in I try to err on the side of safety for the engine. If when I let out on the clutch the RPMs sound too high, I upshift, if it boggs, I downshift.

I hope this helps.
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Old 05-09-2009, 03:08 PM   #10
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Thanks for the suggestions! Every car I have owned in 10 years of driving has been a manual. I have always had sports cars and imports before so it is a little strange getting used to the JK's powerband. I am going to try revving the engine a little higher and see if I still hear it.
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Old 05-09-2009, 03:35 PM   #11
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Ya, silverX, I have been keeping the jeep within a narrow power band, maybe I should wind it out more like a jap bike. No Mark, that was not a typo. All the driving so far has been around town just puttering. I will start working her a bit harder. Thanks for the input.

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Old 05-09-2009, 04:12 PM   #12
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h2otoo, do you ever notice a rattling sound coming from the drivers side with the engine down? It sounds like a diesel engine?
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Old 05-09-2009, 04:24 PM   #13
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Jk,n, Pretty much what you said. I hope I did not sound like I watch the tach too much, just with a new vehicle I am trying to match the sound to the rpm's. I actually took the little dash computer out of the "AVG MPG" mode because I felt I was being too motivated by it. Before I head out tonight I will make note of the recommended shift points and watch the rpms just to see what the factory thinks. Some engines like to be wound up more than others, and I don't know where this one wants to be. Funny, because it is the same one in the AWD van we have and being an auto I could not even tell you if it has a tach (we only owned the van for like 7 yrs!).

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Old 05-09-2009, 04:28 PM   #14
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Oh ya, I know exactly what you are talking about, SilverX. It is lugging for sure.

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Old 05-09-2009, 04:29 PM   #15
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If you are an experienced standard driver and the car is making a weird noise, I would have the dealer check it out.
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Old 05-09-2009, 04:40 PM   #16
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It could be something as innocuous as a loose shield. I had a car with an annoying noise once and that is what it turned out to be.
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Old 05-09-2009, 09:52 PM   #17
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I went for a drive and tried shifting at 3k rpm. It definitely isn't as loud as shifting at 2k-2500 rpm. I guess I was bogging it by not revving it high enough. It isn't a shield or anything like that. It doesn't make any kind of metallic sound or anything. It doesn't sound like it's an issue, but I just wanted to know if others noticed it. If I took it to the dealer I doubt they would say anything is wrong.
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Old 05-09-2009, 10:09 PM   #18
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Looks like others have the same issue:

Engine Clicking? WTF! - JK-Forum.com - The Ultimate Jeep JK Wrangler Bulletin Board

Some say that it is just the injectors, while others have had exhaust manifold problems. I will have to keep an eye on it.
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Old 05-09-2009, 10:12 PM   #19
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My rattle in the accelerator is caused by the rocking Infinity 7-speaker sound system....
BOOM BOOM BOOM....

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