knocking sound holding around 3,000rpm - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

radroach · 04-19-2014, 03:01 PM

Today I drove about 200mi on my way home today, about 70mph the whole way in 6th gear. When I got off the interstate I was driving in 4th gear holding about 3,000 rpm where you normally hear a certain burble of what I guess is the AVCS changing, well holding it at 3,000 rpm it slowly went from normal to a light knocking noise. I went back through 3rd - 4th gear again and again it went from no noise to the same rattle.

Only thing I could gather is the car is hot and tired, and the expanding metals are creating a noise that the car isn't adjusted for. The car felt pretty limp for a minute too, but that might be placebo from coming off the interstate?

Anyway let me know if this is just some fault of the engine adjusting or if I'm experience a real rod knock. I have no idea if the dealership has done any ECU revisions, likely the have not. 30+k miles all stock.

humfrz · 04-19-2014, 04:32 PM

Well, radroach, I'd check the crankcase oil level to make sure it has enough oil.

If it didn't throw you a code and it doesn't happen again, I'd just forget about it....

humfrz

radroach · 04-19-2014, 05:10 PM

Oil levels on the dipstick are good

radroach · 04-20-2014, 10:00 PM

Hi all want to report that the issue earlier hasn't come back all weekend. Car's been running good.

yet if it does again I'll post again in this thread with video.

exE36M3 · 04-20-2014, 10:02 PM

Silly thought - maybe pull all the jack and parts out of the trunk. It's not really that well secured, so it may be from a simple RPM or resonance vibration.

radroach · 04-20-2014, 10:10 PM

Quote:

Originally Posted by exE36M3

\.

It was definitely from the engine at the time. I can definitely tell difference from rear noises from the front (as my license plate vibrates a little bit). I've also got the sound tube still, and get to listen to engine noises all the time. This time it was definitely a noise that didn't sound good, a pinging or rattling noise. I noticed it first when going downhill at around 3k rpms and holding it there, it turned from the normal noise to a rattle.

BTW this isn't the first time it's been reported http://www.ft86club.com/forums/showthread.php?t=13827

radroach · 04-21-2014, 02:52 AM

I'm going to take another guess here, I think the plastic cover over the intake manifold is loose. I took it off a week ago for cleaning and now it has a bit of play in it.

Also took the same 200mi trip back today and it started again a little while after driving in the city. Same sound, happening about 2k rpm, tried to film it but it wasn't picking up over the road noise.

So I'm going to take the cover off, or wrap some electrical tape around the slot to see if it dampens the vibration and holds it together. Will make another post later.

Ultramaroon · 05-17-2015, 09:02 PM

I'm going to revive this thread. I've been noticing exactly this sound for a couple weeks now. It's definitely the engine or in the engine bay. Very frustrating because it comes and goes. Cannot reproduce it at will.

The knock happens mostly when I'm steady-state cruising in fifth, sometimes fourth, and the engine is running around 3000-3500 RPM. If I either apply throttle or release it, the sound disappears.

stevesnj · 05-17-2015, 10:55 PM

Could be a knock sensor but that would usually throw a code. This is an interesting one...

Ultramaroon · 05-17-2015, 11:39 PM

Definitely not detonation/ping. I found an old clip taken by JimmyMac here. He never found the source and has since installed a turbo sooo...

I'll keep looking.

gravitylover · 05-19-2015, 12:03 PM

Sometimes I think I hear a similar sound too when cruising between 3-3.5k rpm but when I go to turn the music down to hear it better it's not there. Maybe I move my foot on the throttle and it goes away... I think tomorrow morning I'l keep the tunes off for a while and see if I hear it.

radroach · 05-19-2015, 03:13 PM

problem hasnt returned since it happened to me, but I'd still like to know what it was.

aagun · 05-19-2015, 05:14 PM

[ame="https://www.youtube.com/watch?v=eqrlwMgfqtY"]FRS BRZ GT 86 DI Failure - YouTube[/ame]

Ultramaroon · 05-19-2015, 06:07 PM

Quote:

Originally Posted by aagun

Damn! That's exactly the sound at about 0:26. I don't hear mine while accelerating, though. Only when I'm running steadily.

Did yours become more obvious over time?

Thank you. I will look at DI as well.

04-19-2014, 03:01 PM	#1
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	knocking sound holding around 3,000rpm Today I drove about 200mi on my way home today, about 70mph the whole way in 6th gear. When I got off the interstate I was driving in 4th gear holding about 3,000 rpm where you normally hear a certain burble of what I guess is the AVCS changing, well holding it at 3,000 rpm it slowly went from normal to a light knocking noise. I went back through 3rd - 4th gear again and again it went from no noise to the same rattle. Only thing I could gather is the car is hot and tired, and the expanding metals are creating a noise that the car isn't adjusted for. The car felt pretty limp for a minute too, but that might be placebo from coming off the interstate? Anyway let me know if this is just some fault of the engine adjusting or if I'm experience a real rod knock. I have no idea if the dealership has done any ECU revisions, likely the have not. 30+k miles all stock.

05-17-2015, 09:02 PM	#8
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,396 Thanks: 53,053 Thanked 37,225 Times in 19,308 Posts Mentioned: 1117 Post(s) Tagged: 9 Thread(s)	I'm going to revive this thread. I've been noticing exactly this sound for a couple weeks now. It's definitely the engine or in the engine bay. Very frustrating because it comes and goes. Cannot reproduce it at will. The knock happens mostly when I'm steady-state cruising in fifth, sometimes fourth, and the engine is running around 3000-3500 RPM. If I either apply throttle or release it, the sound disappears. __________________ service manuals

05-17-2015, 10:55 PM	#9
stevesnj Senior Member Join Date: May 2013 Drives: 2016 FR-S Oceanic Blue Location: Southern NJ Posts: 2,958 Thanks: 2,158 Thanked 1,601 Times in 923 Posts Mentioned: 30 Post(s) Tagged: 2 Thread(s)	Could be a knock sensor but that would usually throw a code. This is an interesting one... __________________ My 2016 Build thread TRD Exhaust with custom quad tips, TRD Lowering Springs,TRD Quick shifter,LED;DRL, Projectors, and turn signals. Re-badge, 86 Nanny, WinmaxW2 Pads, K&N Drop In, Antenna delete

05-17-2015, 11:39 PM	#10
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,396 Thanks: 53,053 Thanked 37,225 Times in 19,308 Posts Mentioned: 1117 Post(s) Tagged: 9 Thread(s)	Definitely not detonation/ping. I found an old clip taken by JimmyMac here. He never found the source and has since installed a turbo sooo... I'll keep looking. __________________ service manuals

05-19-2015, 12:03 PM	#11
gravitylover Senior Member Join Date: Nov 2014 Drives: 2013 BRZ Premium 6MT White Location: SE NY Posts: 1,503 Thanks: 1,218 Thanked 669 Times in 474 Posts Mentioned: 7 Post(s) Tagged: 1 Thread(s)	Sometimes I think I hear a similar sound too when cruising between 3-3.5k rpm but when I go to turn the music down to hear it better it's not there. Maybe I move my foot on the throttle and it goes away... I think tomorrow morning I'l keep the tunes off for a while and see if I hear it. __________________

04-19-2014, 04:32 PM	#2
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,407 Thanks: 29,790 Thanked 32,807 Times in 16,828 Posts Mentioned: 715 Post(s) Tagged: 2 Thread(s)	Well, radroach, I'd check the crankcase oil level to make sure it has enough oil. If it didn't throw you a code and it doesn't happen again, I'd just forget about it.... humfrz

04-19-2014, 05:10 PM	#3
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	Oil levels on the dipstick are good

04-20-2014, 10:00 PM	#4
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	Hi all want to report that the issue earlier hasn't come back all weekend. Car's been running good. yet if it does again I'll post again in this thread with video.

04-20-2014, 10:02 PM	#5
exE36M3 Senior Member Join Date: Mar 2014 Drives: 2013 BRZ Location: NorCal Posts: 331 Thanks: 165 Thanked 173 Times in 93 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Silly thought - maybe pull all the jack and parts out of the trunk. It's not really that well secured, so it may be from a simple RPM or resonance vibration.

04-21-2014, 02:52 AM	#7
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	I'm going to take another guess here, I think the plastic cover over the intake manifold is loose. I took it off a week ago for cleaning and now it has a bit of play in it. Also took the same 200mi trip back today and it started again a little while after driving in the city. Same sound, happening about 2k rpm, tried to film it but it wasn't picking up over the road noise. So I'm going to take the cover off, or wrap some electrical tape around the slot to see if it dampens the vibration and holds it together. Will make another post later.

05-19-2015, 03:13 PM	#12
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	problem hasnt returned since it happened to me, but I'd still like to know what it was.

05-19-2015, 05:14 PM	#13
aagun Senior Member Join Date: Nov 2012 Drives: 86 Location: uae Posts: 403 Thanks: 202 Thanked 67 Times in 56 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	[ame="https://www.youtube.com/watch?v=eqrlwMgfqtY"]FRS BRZ GT 86 DI Failure - YouTube[/ame]

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