Cold weather knocking during start ups. - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

JDMenrique · 01-23-2013, 11:22 AM

Firstly, Im going to apologize for not using the search function. Im on my phone and it just won't let me. For the last couple weeks its been frigid with temps between 10-35ºF. When I first turn the car on its knocks pretty hard, maybe about once every 3-5 seconds and gradually diminishing til its gone. I don't have any other idle issues, no dips or random oscillations. I can't figure it out, is there anyone out there that has also experienced this? Anything documented?

Thanks in advance

whtchocla7e · 01-23-2013, 03:00 PM

Yes, I mentioned this in another thread and called it "stumbling".
The engine "stumbles" for a short moment right after I fire it up.
I've had this happen during cold, cold mornings... like today.

JDMenrique · 01-23-2013, 04:03 PM

Quote:

Originally Posted by whtchocla7e

Yes, I mentioned this in another thread and called it "stumbling".
The engine "stumbles" for a short moment right after I fire it up.
I've had this happen during cold, cold mornings... like today.

Do you know if theres any info out regarding this? Im sure it can't be normal. I just feel like its gonna do it so hard the engine is gonna shit itself

A5D5TRYR · 01-23-2013, 04:46 PM

Mine has done this the last couple days with it being really cold. It almost sounds like the engine makes a small cough every 5 seconds or so. Oddly enough if I just engage first and start driving it goes away immediately. It only does it on idle so I just don't let the car sit and idle when it's cold.

Tt3Sheppard · 01-23-2013, 04:49 PM

Hmm I might check for this today or tomorrow. Only thing I've noticed when cold is that it takes about 5 mins of driving to get warm air out of the vents. Also the clutch feels stiff but I think thats normal.

JDMenrique · 01-23-2013, 06:23 PM

Quote:

Originally Posted by A5D5TRYR

Mine has done this the last couple days with it being really cold. It almost sounds like the engine makes a small cough every 5 seconds or so. Oddly enough if I just engage first and start driving it goes away immediately. It only does it on idle so I just don't let the car sit and idle when it's cold.

I havent tried that, ill check it out tmw.

Quote:

Originally Posted by Tt3Sheppard

Hmm I might check for this today or tomorrow. Only thing I've noticed when cold is that it takes about 5 mins of driving to get warm air out of the vents. Also the clutch feels stiff but I think thats normal.

its pretty loud, like you could walk away a good 20-30 feet and hear it

PRORICAN · 01-23-2013, 06:33 PM

Haven't heard knocking but it does stumble a bit when really cold on mine.

JDMenrique · 01-23-2013, 06:38 PM

Quote:

Originally Posted by PRORICAN

Haven't heard knocking but it does stumble a bit when really cold on mine.

is it loud? knocking was the only way i could describe it. SAM TELL ME ITS GONNA BE OK!?!?

PRORICAN · 01-23-2013, 06:42 PM

Quote:

Originally Posted by JDMenrique

is it loud? knocking was the only way i could describe it. SAM TELL ME ITS GONNA BE OK!?!?

Well it wasn't really loud it was more of a idle dip every few seconds but never heard a knocking type sound but I'll pay more attention tomorrow morning.
If it happens to you again just take it to the dealer and use that warranty to be on the safe side.

Subie · 01-23-2013, 07:56 PM

Mine will stumble once or twice not long after startup on a cold day. It needs to warm up a little to run properly it seems.

BadLuck · 01-23-2013, 08:02 PM

Mine doesn't knock but I do hear a difference when it finally warms up. Mine also sounds like it shutters in the deeper cold weather.

Z3D · 01-23-2013, 08:22 PM

My BRZ did this same thing today. I think it has something to do with the chemical composition of the gasoline when the temperature fluctuates so much. I will say, I got horrible gas milage today and am very displeased.

grodenglaive · 01-25-2013, 12:28 PM

Mine did that once, the first time we had a cold snap. Sounded like something broke under the hood. Never happened again though.

NYC BRZ · 01-25-2013, 12:54 PM

I've been having long start and the stumble as well. I just drive and baby it for a bit until the car warms up. Mine had a screeching sound on a cold start one morning and it sounded like it was running with 0 oil for a few seconds. Scary stuff.

01-23-2013, 03:00 PM	#2
whtchocla7e Senior Member Join Date: May 2012 Drives: 2013 FR-S Hot Lava Location: CT Posts: 424 Thanks: 30 Thanked 222 Times in 81 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Yes, I mentioned this in another thread and called it "stumbling". The engine "stumbles" for a short moment right after I fire it up. I've had this happen during cold, cold mornings... like today. __________________ Live to drive another day

01-23-2013, 04:46 PM	#4
A5D5TRYR Senior Member Join Date: Nov 2012 Drives: FR-S 6MT Ultramarine (BeeDrill) Location: London, Canada Posts: 238 Thanks: 104 Thanked 56 Times in 38 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Mine has done this the last couple days with it being really cold. It almost sounds like the engine makes a small cough every 5 seconds or so. Oddly enough if I just engage first and start driving it goes away immediately. It only does it on idle so I just don't let the car sit and idle when it's cold. __________________ 2013 Scion FR-S - Ultramarine 6MT

01-25-2013, 12:54 PM	#14
NYC BRZ AutoX Addict Join Date: Mar 2012 Drives: 08 Pontiac G8 GT,13 GBS BRZ Limited Location: Queens, NY Posts: 723 Thanks: 168 Thanked 118 Times in 83 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I've been having long start and the stumble as well. I just drive and baby it for a bit until the car warms up. Mine had a screeching sound on a cold start one morning and it sounded like it was running with 0 oil for a few seconds. Scary stuff. __________________ 2013 BRZ Limited- GBS - 6MT -VIN #0937 ~~NYR SCCA # 18 C Street R (CSR)~~ "But there’s no mistaking the noise. This car is loud, and not in a particularly nice way. There’s no crisp exhaust note, no induction wheezing. It’s just the sound of petrol exploding in a metal box." - Jeremy Clarkson

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01-23-2013, 06:33 PM	#7
PRORICAN Senior Member Join Date: Jun 2012 Drives: BRZ Location: Cape Cod Posts: 804 Thanks: 872 Thanked 560 Times in 258 Posts Mentioned: 26 Post(s) Tagged: 0 Thread(s)	Haven't heard knocking but it does stumble a bit when really cold on mine.

01-23-2013, 07:56 PM	#10
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01-23-2013, 08:22 PM	#12
Z3D Member Join Date: Jan 2013 Drives: BRZ Location: Massachusetts Posts: 89 Thanks: 38 Thanked 20 Times in 13 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	My BRZ did this same thing today. I think it has something to do with the chemical composition of the gasoline when the temperature fluctuates so much. I will say, I got horrible gas milage today and am very displeased.

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