Sputter/Rough engine at start? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

iLaw · 10-21-2014, 07:19 PM

So my BRZ is less than 2000kms old. Today it was cold wet and raining. When I started my car, it "coughed" a few times once the engine started. The whole car shaked. I hope it wasn't a knock or anything. Is this common with this engine? I haven't been able to reproduce it yet. Car drives normally afterwards.

arvidj · 10-22-2014, 10:00 AM

My 2015 FRS will do that on occasion. When starting after having sat all night it may misfire once or twice during the first 10 seconds or so.

With only 2200 miles on it I can not comment on what long term harm might be associated with this behavior.

DocWalt · 10-22-2014, 04:24 PM

No idea, but my '13 has done it on cold starts (below ~50* F) since I bought it last year.

Snake · 10-22-2014, 09:21 PM

At 12.5:1 compression it's surprising that the car will start at all when cold (the wonders of modern technology!). I'd say a misfire or two on start-up is relatively normal if it's only when it's cold and there are no other noises associated with it.

I used to own a 2ltr Renaultsport with 11:1 compression that would misfire when cold consistently. I owned that car for 5 years, did at least 40 track days in it and drove it hard everywhere (once warmed up) and it never once used a drop of oil and ran strong until I sold it.

10-21-2014, 07:19 PM	#1
iLaw Senior Member Join Date: Sep 2014 Drives: 2015 BRZ, Aozora Edition Location: Mississauga, ON, Canada Posts: 354 Thanks: 40 Thanked 249 Times in 100 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	Sputter/Rough engine at start? So my BRZ is less than 2000kms old. Today it was cold wet and raining. When I started my car, it "coughed" a few times once the engine started. The whole car shaked. I hope it wasn't a knock or anything. Is this common with this engine? I haven't been able to reproduce it yet. Car drives normally afterwards. __________________ iLaw 2020 Subaru Crosstrek Sport 2015 Subaru BRZ Aozora Edition (Sold)

10-22-2014, 10:00 AM	#2
arvidj Member Join Date: Jul 2014 Drives: '93 MR2 Turbo Location: Minneapolis, Minnesota Posts: 45 Thanks: 16 Thanked 15 Times in 11 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	My 2015 FRS will do that on occasion. When starting after having sat all night it may misfire once or twice during the first 10 seconds or so. With only 2200 miles on it I can not comment on what long term harm might be associated with this behavior. __________________ Red '93 MR2 Turbo, daily driver, 129,000 miles Red '93 MR2 Turbo, garage queen, 24,683 miles Red '15 FRS Automatic, TRD Springs, Swaybars, Brake Pads

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10-22-2014, 04:24 PM	#3
DocWalt Senior Member Join Date: Oct 2013 Drives: '22 BRZ Location: PA Posts: 1,946 Thanks: 2,427 Thanked 1,669 Times in 843 Posts Mentioned: 25 Post(s) Tagged: 2 Thread(s)	No idea, but my '13 has done it on cold starts (below ~50* F) since I bought it last year.

10-22-2014, 09:21 PM	#4
Snake Senior Member Join Date: Dec 2012 Drives: ADM Toyota 86 GT Location: Australia Posts: 117 Thanks: 32 Thanked 63 Times in 37 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	At 12.5:1 compression it's surprising that the car will start at all when cold (the wonders of modern technology!). I'd say a misfire or two on start-up is relatively normal if it's only when it's cold and there are no other noises associated with it. I used to own a 2ltr Renaultsport with 11:1 compression that would misfire when cold consistently. I owned that car for 5 years, did at least 40 track days in it and drove it hard everywhere (once warmed up) and it never once used a drop of oil and ran strong until I sold it.

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