jar of marbles sound like in engine
 

Hello guys. Just want to ask other MT owners here. Do you guys hear jar of marbles in the engine area during deceleration 1st-4th gear under 2200rpm? it's not continuous but after you put gas and let it decelerate(foot off pedal).

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During deceleration. it starts from 2200rpm going down. it got a sound clip but don't know how to post it. :(

liiiikkkee knock? lol i have no noises. what fuel do your run?

Loose heatshield?

Yes, that's normal.

http://www.ft86club.com/forums/showthread.php?t=8344

http://www.ft86club.com/forums/showthread.php?t=60451

Jar of marbles noises from our car might as well be listed in the brochure as a feature. Well documented noise. Please search next time. :thumbsup:

It's not the engine I think, its shudder from "lugging"

I bet if you depress the clutch while it is making that sound it stops eh?

you mean when you put the car in neutral at about 40 and coast? clutch chatter is what you are hearing.

If you ever drive a car with a solid hub clutch you'll really hear the noise.

The likely cause is rapid loading and unloading of the clutch on the input shaft caused by power variations during the Otto cycle.

My advice, turn the radio on and don't pay attention to noises this car will drive you crazy

Not knock. It's like a loose chain inside. I run 91octane always = california.

Nope. Checked it. all tight screws.

Saw those posts but they really never answered it. did not read the whole explanation. I did have my engine rebuilt in front due to the idle dip, CEL plague. Not sure if it's related.

:)
Yes it does stop it when clutch is in. i don't know if it is that.
nope.
I'll search that. :)

Are you hearing it at idle shortly after starting the engine. Thats also clutch chatter

bad timing chain tensioner? they normally are looser off throttle. im not sure if these run on oil pressue like s2k

This sound is most likely due to the pumping effect of the drive train turning the motor. There is no combustion, but a lot of air is still being 'dragged' through the engine as a result of deceleration. You'll notice that the sound changes immediately around 800rpm as the motor starts feeding some gas back in to prevent a stall.

Nope. Not present during idle.

when i search for engine jar of marbles like sound that words pops out.

hmm. i'm getting your point. i'm just searching through and want know what is going on. Thanks.

ya my girls maxima has a worn timing chain right now. its over 100k unchanged though, that is the maintenance interval so im sure your under that. you could very well have a faulty tensionor and the chain is slapping the front cover

holy wild guesses batman!

I'll try - Its the....passenger side seat belt retractor

This gets my vote. You're probably hearing drivetrain chatter/lash, it sounds like the gears being pushed/pulled from slight accel/decel when the drivetrain transitions from engine load to engine drag, the drivetrain kind of bounces a little bit. If you barely tap on/off the gas it'll repeat, but it only happens when the clutch is engaged. Disengage the clutch, sound disappears because there's no engine load.

The reason you hear it below those rpm in 1st through 4th is because the engine noise masks it at higher rpm and higher speed/road noise. Also, at higher rpm, parts of the drivetrain are spinning faster, so on/off throttle transitions happens much quicker.

edit-btw this is completely normal. I think stiffer bushings help reduce it (and the rubber band feeling in the drivetrain) but nothing can completely eliminate it.

My car does it too, it's gotten louder over the last 6 months or maybe I'm better at picking up abnormal noises.

90% sure it's flywheel/clutch rattle, I posted this video in the thread linked above:
Edit: combined with gears and slop in the drivetrain mentioned by wheelhaus above, I wouldn't worry. Drivetrain failures (from the motor output to the wheels) so far have been a rarity, especially if you're stock.
[ame="https://www.youtube.com/watch?v=y7DE4iPLOhE"]Clutch Plate Faults - When a rattle is clutch plate springs and not a gearbox fault. - YouTube[/ame]


This pops up on Subaru forums all the time with the standard Exedy clutch replacement. Rode in a buddy's WRX who just got a new Exedy put in and it was louder than my FRS.
:iono:

Thanks everyone! I'm understanding what every posts and how it's working and where it is coming from. I really wanted to take a course related to mechanic stuff. Just to have an idea of everything. But with people here i get to learn stuff already. Thanks thanks!


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Has anyone noticed how often that phrase gets used around here?

I'm waiting for the thread where someone posts, "Today I was taking a hard turn on a back road at 7000 RPM when demonic fire enveloped my car and Satan materialized in my passenger seat offering me unlimited track access. Has anyone else had this problem?"

And then someone else responds, "Yes, that's normal" and includes links to other threads where the issue of drivers inadvertently summoning demons has already been discussed.

Yeah, it gets used a lot. Wanna know why? Because the same questions get asked a lot, and a lot of users are analyzing every little noise they hear, which many are.... you guessed it! NORMAL.

OP asked if we hear that sound (didn't ask for the mechanical engineering explanation as to what caused it), and the appropriate answer is "Yes", and to make the OP sleep easy at night, I added "that's normal".

^ I do the same thing, but always try to explain why or what's causing it. Just saying "it's normal" sometimes doesn't help, and sometimes is only to troll (I think that's what extrashaky is getting at). There's always a chance (more like a guarantee) that everyone will have a different explanation. Hopefully one nails the OP's problem accurately.

I only get worried if the OP's explanation is accurate for a completely different problem, but due to the OP's possible lack of knowledge or misinterpretation of the symptoms, is told "it's normal" when in fact, it's not and needs serious attention. We can only do so much for each other through internet typing and shitty cell phone videos... lol

Relax. I wasn't criticizing your response. I just find it entertaining that this car has so many odd quirks that are "normal."

Not at all. I thought the links did a good job of providing background on the problem. Again, I wasn't criticizing.

Ah right, now I get what you're saying.