Knocking/Rattle on start up. - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

jimbobrand · 11-12-2013, 12:46 PM

Hey guys, I had a weird issue this morning when I started up my BRZ. Upon start up it made a knocking noise that sounded a bit like detonation but went away after a second or two. This was followed by a small ammount of knocking/rattling (quiet and only lasting 1-2 seconds) while driving down the street and then nothing after that. I've had my car since June 2012 and I have 32,000+ miles on it and this is the first time this has happened. I've had no CELs and my only mods are a Nameless axelback and a AFE intake that have been on the car for a year. Anyone else have this issue or had something similar happen? Thanks!

Cjymiller · 11-13-2013, 02:50 PM

Just noticed this morning as well. Maybe its the colder weather. It was only knocking during idle in traffic. It went away after 2 miles.

Mikem53 · 11-13-2013, 09:11 PM

same here.. This morning was the coldest I experienced with this car.
it was garaged and probably upper 50's in there when I fired it up..
It popped and ran rough for a second or two.. ran fine after it warmed up..
Had 2 hours worth of driving later and it runs fine.. First time in 4500 miles
that I heard it pop and studder.. not concerned about it.. but this is one
weird little engine.

ronboogieon · 11-13-2013, 09:12 PM

Mine did this morning too. I read in some other thread that its the cats warming up.

Suberman · 11-13-2013, 09:32 PM

If you fit a cold air intake you will experience problems in cold weather. If cold air intakes actually worked then manufacturers would install them. They don't work and they don't.

mainstream · 11-13-2013, 09:49 PM

46 degrees out had a rough idle for about 6-7 seconds then a kind of low pop that appears like it came from the back.

Went away after driving for 10-15 min

jimbobrand · 11-14-2013, 12:33 PM

Quote:

Originally Posted by Suberman

If you fit a cold air intake you will experience problems in cold weather. If cold air intakes actually worked then manufacturers would install them. They don't work and they don't.

If that were the case then I should have experienced this last year since I installed the AFE intake in October 2012 and about 20,000 miles ago. The morning that this happened wasn't even the coldest morning this week and it hasn't happened since when it's been colder.

GarageBRZTuning · 11-14-2013, 11:00 PM

I recently installed a K&N Cold Air Intake in my BRZ and noticed the same problem on a cold start-up. My car only has 1300 miles and on it and I honestly thought it was the intake.. After taking the intake out and putting the OEM Intake in the problem didn't go away... If anything the noise actually got quieter. I'm taking it the the dealership in a couple of weeks and seeing if they know what's wrong with it! Glad to know I"m not the only one that experienced this problem. Thanks for letting me know I'm not going insane!!

Rayme · 11-14-2013, 11:11 PM

This car has some crazy startup sounds in the cold, the exhaust is very loud for the first 10-15 seconds. And the engine itself is also very loud.

BRZnut · 11-14-2013, 11:58 PM

mine too..last winter and now this fall--->on cold days (below 50 degrees F), the engine starts very rough with an occl pop sound at idle. Once driving, everything is ok. The twins just hate the cold! (like my wife!)

jimbobrand · 11-15-2013, 09:43 AM

My car will be going back to the dealership this afternoon for the cam plate/oil leak issue (again) and I'm going to have them look into the knocking on start-up. It hasn't made the noise since but I'm hoping that they could at least eliminate detonation from the list of possibilities.

airmanmurphy02 · 11-16-2013, 05:57 PM

i'm guessing cold weather too. mine does it after sitting outside at work in the parking lot all day, but not in the morning in the garage. kinda bothered me the first time.. though after a couple blips of the throttle it goes away and doesn't return.

Razz · 11-16-2013, 09:13 PM

Popping sound in the cold is probably from your DI seals shrinking.

Cjymiller · 01-10-2014, 05:55 PM

Quote:

Originally Posted by jimbobrand

My car will be going back to the dealership this afternoon for the cam plate/oil leak issue (again) and I'm going to have them look into the knocking on start-up. It hasn't made the noise since but I'm hoping that they could at least eliminate detonation from the list of possibilities.

Any update with the knocking in the morning? What did the dealer say?

11-12-2013, 12:46 PM	#1
jimbobrand Senior Member Join Date: Jun 2012 Drives: 2013 Subaru BRZ Premium Location: San Antonio, TX Posts: 240 Thanks: 29 Thanked 73 Times in 51 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Knocking/Rattle on start up. Hey guys, I had a weird issue this morning when I started up my BRZ. Upon start up it made a knocking noise that sounded a bit like detonation but went away after a second or two. This was followed by a small ammount of knocking/rattling (quiet and only lasting 1-2 seconds) while driving down the street and then nothing after that. I've had my car since June 2012 and I have 32,000+ miles on it and this is the first time this has happened. I've had no CELs and my only mods are a Nameless axelback and a AFE intake that have been on the car for a year. Anyone else have this issue or had something similar happen? Thanks! __________________ Jim Brand 2013 Subaru BRZ Premium 6MT WRBP Oklahoma Subaru Crew-OKSC.org TXIC San Antonio

11-14-2013, 11:11 PM	#9
Rayme The Answer Join Date: Sep 2012 Drives: Mazda 2 Location: Moncton, NB Posts: 1,233 Thanks: 488 Thanked 661 Times in 315 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	This car has some crazy startup sounds in the cold, the exhaust is very loud for the first 10-15 seconds. And the engine itself is also very loud. __________________ \| Roof wrap thread

11-15-2013, 09:43 AM	#11
jimbobrand Senior Member Join Date: Jun 2012 Drives: 2013 Subaru BRZ Premium Location: San Antonio, TX Posts: 240 Thanks: 29 Thanked 73 Times in 51 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	My car will be going back to the dealership this afternoon for the cam plate/oil leak issue (again) and I'm going to have them look into the knocking on start-up. It hasn't made the noise since but I'm hoping that they could at least eliminate detonation from the list of possibilities. __________________ Jim Brand 2013 Subaru BRZ Premium 6MT WRBP Oklahoma Subaru Crew-OKSC.org TXIC San Antonio

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11-13-2013, 09:11 PM	#3
Mikem53 Senior Member Join Date: Apr 2013 Drives: FR-S 6MT Location: Somewhere in Space Posts: 1,565 Thanks: 500 Thanked 882 Times in 433 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	same here.. This morning was the coldest I experienced with this car. it was garaged and probably upper 50's in there when I fired it up.. It popped and ran rough for a second or two.. ran fine after it warmed up.. Had 2 hours worth of driving later and it runs fine.. First time in 4500 miles that I heard it pop and studder.. not concerned about it.. but this is one weird little engine.

11-13-2013, 09:12 PM	#4
ronboogieon BReeZy Hunter Join Date: Jun 2013 Drives: 13 DGM BRZ Limited 6MT Location: Irvine, CA Posts: 220 Thanks: 66 Thanked 76 Times in 60 Posts Mentioned: 1 Post(s) Tagged: 1 Thread(s)	Mine did this morning too. I read in some other thread that its the cats warming up.

11-13-2013, 09:32 PM	#5
Suberman Banned Join Date: Jul 2013 Drives: Subaru BRZ Sport Tech Satin White Location: Calgary, Alberta,Canada Posts: 1,228 Thanks: 147 Thanked 320 Times in 225 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	If you fit a cold air intake you will experience problems in cold weather. If cold air intakes actually worked then manufacturers would install them. They don't work and they don't.

11-14-2013, 11:00 PM	#8
GarageBRZTuning Junior Member Join Date: Oct 2013 Drives: 2013 Subaru BRZ Limited Silver MT Location: Colorado Posts: 6 Thanks: 0 Thanked 7 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I recently installed a K&N Cold Air Intake in my BRZ and noticed the same problem on a cold start-up. My car only has 1300 miles and on it and I honestly thought it was the intake.. After taking the intake out and putting the OEM Intake in the problem didn't go away... If anything the noise actually got quieter. I'm taking it the the dealership in a couple of weeks and seeing if they know what's wrong with it! Glad to know I"m not the only one that experienced this problem. Thanks for letting me know I'm not going insane!!

11-14-2013, 11:58 PM	#10
BRZnut Senior Member Join Date: Oct 2012 Drives: BRZ DGM Limited Location: USA Posts: 1,237 Thanks: 5 Thanked 431 Times in 250 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	mine too..last winter and now this fall--->on cold days (below 50 degrees F), the engine starts very rough with an occl pop sound at idle. Once driving, everything is ok. The twins just hate the cold! (like my wife!)

11-16-2013, 09:13 PM	#13
Razz Senior Member Join Date: Jun 2012 Drives: Fast Location: United States Posts: 480 Thanks: 64 Thanked 101 Times in 71 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Popping sound in the cold is probably from your DI seals shrinking.

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