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Issues | Warranty | Recalls / TSB Problems, issues, recalls, TSBs


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Old 06-17-2019, 03:48 PM   #1
MilkyWitness
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Clatter noise when giving throttle between 2-3k RPM in any gear.

I had a stage 2 tune with Tomei UEL headers, and went back to stock tune/headers because I wanted to get some EL headers and sell the UEL. Anyways I was tuned with ECUTek and I used their program to go back to the stock tune. No CEL, let the ECU relearn.

Now I am getting a weird clatter noise. I have made sure nothing is lose, I've been under my car for the past 3 days chasing anything I can find and making sure its secure.

When I am driving I will be between 2-3k RPM in any gear and give it some gas whether its light throttle or heavy throttle like 2/3 times I can make it have a little clatter sound. Almost sounds like valve clatter or something? Maybe it has to do with VVT? I was told my stage 2 tune had an aggressive vvt setting, and am wondering what happened when I went back to stock because I have this weird clatter sound I never heard before. It seems to be easier to reproduce it when I am going uphill.
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Old 06-17-2019, 03:54 PM   #2
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Yeah it’s normal, you learn to live with it. Sounds a bit alarming but that’s just the sound of the engine/drivetrain
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Old 06-17-2019, 03:55 PM   #3
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Thanks for the reply, definitely is alarming! I know these engines make a ton of random noises, but this one scared me a bit as I don't know if its damaging at all.
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Old 06-18-2019, 02:18 PM   #4
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Confirm all your Header bolts are tight. I had a weird rattle on first twin way back when I had my Borla UEL header as 1-2 bolts are a PITA to get tight. When i took it off I found 1 bolt really loose and another semi loose...
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Old 06-18-2019, 03:22 PM   #5
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I'm pretty sure I read on here people saying that the reverse lockout on the shifter can rattle a bit when applying throttle. Certain that isn't the noise? Mine does that sometimes depending on how fast I'm going, road quality, etc.
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Old 06-18-2019, 05:12 PM   #6
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It could also be a heat shield. Every Subaru I've ever had including this one have a rattly heat shield at some point. This one rattles badly right at 4k RPM but not above or below. I stopped being concerned with it a long time ago. Hopefully they'll find that rattle when they have the motor out next month for the recall work to be done.
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Old 06-18-2019, 10:09 PM   #7
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Another alarming rattle is one that comes from the spring inside the clutch master cylinder. I get it very infrequently when it's particularly hot under the hood, always resonates at around 4K. Disappears as soon as I lightly tap the pedal.
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Old 06-18-2019, 11:18 PM   #8
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Thanks for the replies. It isn't the reverse lock out, the sound is coming from past the firewall somewhere on the lower side of the engine bay. I remember reading somewhere that perhaps its the rush of air at the connection of the header to overpipe/front pipe. I think I'm gonna go pick up a small microphone and somehow jerryrig it under my car and try to pin point the location over the next week. All my header bolts are fully tight, every bolt I can see is tight, and the heat shield is fully secure, and I even put some rubber grommets between it and the frame.

Last edited by MilkyWitness; 06-19-2019 at 07:07 AM.
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Old 06-19-2019, 04:34 PM   #9
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@MilkyWitness

Make sure you haven't toasted your throw out bearing. Mine was rattling when hot, drove me nuts because I was afraid the fuel pump might have been going bad, or maybe timing chain, or other thing.

Sound clip. It would rattle worse when in gear.
https://streamable.com/0ka17

I know your car is new though but it might be worth checking (each TOB I had before lasted ~50k miles before needing replacement.)

Just had my throw out bearing replaced (along with other recall work). Got it back yesterday, seems to have fixed the issue.

Last edited by radroach; 06-19-2019 at 04:45 PM.
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