Rattling noise under the hood during engine braking at low RPM

[Sigh-on-Rice]

Originally Posted by eriktherod

I've heard the noise. I've been able to get it to occur when being feathery in the throttle at low speeds in first/second gear (say below 2k rpm). I'm used to riding second gear sort of low (6-10mph) while in parking lots looking for a spot. When I give it a little gas, I typically hear that noise. Pretty sure it normal.

Yep, I know the noise you're talking about During acceleration at low RPM is normal because I get that noise from every car I drove. The noise I'm talking about in this thread is specifically during deceleration (engine braking). Say I'm traveling at 20 mph and down shift to 2nd gear. The RPM goes down as the car slows down. When the RPM goes below 2000 RPM, it starts to make noise that sounds like a metal plate rattling against another metal plate.

[eriktherod]

I'll check it out tomorrow!

[Sigh-on-Rice]

Originally Posted by eriktherod

I'll check it out tomorrow!

Any chance to check it out?

[eriktherod]

I tried and it felt like the same sound I was used to.. I didn't noticed anything other than the typical noise I expected.

[Sigh-on-Rice]

Originally Posted by eriktherod

I tried and it felt like the same sound I was used to.. I didn't noticed anything other than the typical noise I expected.

Thanks for checking. I guess mine has a problem. I hope the noise goes away after I put some more miles on it.

[#87]

Have you had this sound just after the downshift? I think I heard it once or twice a chattering type sound but I attributed it to a bad shift on my part, not exactly sure what triggered it.

[Sigh-on-Rice]

Originally Posted by dhenz

I also have the same problem, the rattling occurs between 1200 to 1600rpm, I tried to replace spark plugs but nothing happened... any ideas would be great. thanks

______________________________________
car parts/oem parts
performance parts/replacement parts

Are you hearing this noise while you're decelerating in gear? And it only happens on 1st, 2nd, and 3rd gear, but not in 4th gear?

[Pscylo]

I only get the grainy noise in 1st/2nd at low rpm because of the clutch thats used, if I am in any other gear and drop low enough I downshift out of habit, so I never heard it in 3rd.

Side note its all over the forum, should have just been a sticky by now that explains the expected noises so people won't repeatedly ask about them. Not saying this guy has the same noise, but it made me think about it.

[Sigh-on-Rice]

Originally Posted by Pscylo

I only get the grainy noise in 1st/2nd at low rpm because of the clutch thats used, if I am in any other gear and drop low enough I downshift out of habit, so I never heard it in 3rd.

Side note its all over the forum, should have just been a sticky by now that explains the expected noises so people won't repeatedly ask about them. Not saying this guy has the same noise, but it made me think about it.

Is that noise during engine braking (deceleration)?
I agree that here should be a sticky thread with the list of all normal/expected noises.

[Pscylo]

Yup during engine braking at low RPM in low gears is when I hear the grrrrrrrrrr....reminds me of metal rolling on sandy pavement. Usually in the parking lot at work and in my apartments because low speeds are required and as soon as I let off the gas and the engine starts to brake, the noise kicks in.

The setup, engine, and injection system are all new to me, so I have been paying serious attention to everything that happens from day 1, and usually research things I hear that I do not recognize.

[Koji_Online]

Originally Posted by dhenz

I also have the same problem, the rattling occurs between 1200 to 1600rpm, I tried to replace spark plugs but nothing happened... any ideas would be great. thanks

______________________________________
car parts/oem parts
performance parts/replacement parts

On a side note; Whoah did you really change the plugs??
Please share any secrets to doing this efficiently with the least hassle =D

[Mcdj18]

Originally Posted by Pscylo

Yup during engine braking at low RPM in low gears is when I hear the grrrrrrrrrr....reminds me of metal rolling on sandy pavement. Usually in the parking lot at work and in my apartments because low speeds are required and as soon as I let off the gas and the engine starts to brake, the noise kicks in.

The setup, engine, and injection system are all new to me, so I have been paying serious attention to everything that happens from day 1, and usually research things I hear that I do not recognize.

Having the same issue. Brought my car in for servicing today. Waiting to hear from them. I'll post the results when I get word hopefully soon

[Pscylo]

I know why I have the sounds I have though, so I am not concerned. They used a clutch that is for stability and durability on a high revving engine, as a result, low rpm/low gear rolling, it sounds notchy. There's info about it all over the boards.

[ap5512]

Just picked up my BRZ yesterday and today i just noticed that grainy/rattly type noise. It definitely sounded like it came from below the car like either below the engine or near the tranny. Im a little freaked out myself but keep telling myself that its a new car and that I've never owned a Subaru so I will just Keep Calm & Carry On.