Ragged on start up - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Qwimby1 · 12-14-2022, 12:14 PM

2014 FR-S, Stage 2 OFT, E85 fuel, ESC. Fuel usually tests right at 85%. This setup has been fine for 10,000 miles or so, but lately started stumbling and quits on the first cold start attempt. Always starts on the second push but runs ragged for the first couple seconds then OK. No other problems evident. I was planning to change the plugs until reading some comments about 100K or more on plugs. Right at 60K now and I'm suspecting maybe spark plugs or fuel filter. ???

Grady · 12-14-2022, 07:09 PM

Fuel filters cause issues at WOT. OFT is not know for its E85 cold start abilities. The ones reporting 100k on plugs are stock. When you up the power you wear the plugs faster. That is a good place to start. A log of the start may help some.

Qwimby1 · 12-15-2022, 10:04 AM

Excellent points. Thanks.

Qwimby1 · 01-08-2023, 12:52 PM

Switched from E85 to 93 just to test. Starts right away and smoothly now.

Sapphireho · 01-08-2023, 01:11 PM

Quote:

Originally Posted by Qwimby1

Switched from E85 to 93 just to test. Starts right away and smoothly now.

Has it been a little colder in Florida?

Qwimby1 · 01-08-2023, 03:40 PM

Quote:

Originally Posted by Sapphireho

Has it been a little colder in Florida?

Yeah, it has.

Sapphireho · 01-08-2023, 03:49 PM

Quote:

Originally Posted by Qwimby1

Yeah, it has.

I have a flex fuel kit. When I lived in Nor Cal and ran E85 I always got fuel at 87-85%. Even in Cal, in winter, it would start harder. I would put a bit of premium with the E85 to lower % a bit and it would solve the problem.

Qwimby1 · 01-10-2023, 11:19 AM

When I say cold in Florida its all relative. We had a couple of 40 degree nights and then back to 70. It didn't change the starting situation. Now running 93 and it starts normally. I hadn't checked for a while, but what I was getting ran right at 85%.

12-14-2022, 12:14 PM	#1
Qwimby1 Senior Member Join Date: Nov 2015 Drives: 14 FRS Monogram, 05 Mazdasped Miata Location: Sarasota, FL Posts: 599 Thanks: 139 Thanked 151 Times in 110 Posts Mentioned: 4 Post(s)	Ragged on start up 2014 FR-S, Stage 2 OFT, E85 fuel, ESC. Fuel usually tests right at 85%. This setup has been fine for 10,000 miles or so, but lately started stumbling and quits on the first cold start attempt. Always starts on the second push but runs ragged for the first couple seconds then OK. No other problems evident. I was planning to change the plugs until reading some comments about 100K or more on plugs. Right at 60K now and I'm suspecting maybe spark plugs or fuel filter. ???

01-08-2023, 12:52 PM	#4
Qwimby1 Senior Member Join Date: Nov 2015 Drives: 14 FRS Monogram, 05 Mazdasped Miata Location: Sarasota, FL Posts: 599 Thanks: 139 Thanked 151 Times in 110 Posts Mentioned: 4 Post(s)	Switched from E85 to 93 just to test. Starts right away and smoothly now. Last edited by Qwimby1; 01-08-2023 at 12:53 PM. Reason: New information

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12-14-2022, 07:09 PM	#2
Grady Senior Member Join Date: Jun 2017 Drives: BRZ Yellow, Ranger, Evora, WCM S2K Location: Dallas Posts: 1,712 Thanks: 354 Thanked 1,500 Times in 786 Posts Mentioned: 14 Post(s)	Fuel filters cause issues at WOT. OFT is not know for its E85 cold start abilities. The ones reporting 100k on plugs are stock. When you up the power you wear the plugs faster. That is a good place to start. A log of the start may help some.

12-15-2022, 10:04 AM	#3
Qwimby1 Senior Member Join Date: Nov 2015 Drives: 14 FRS Monogram, 05 Mazdasped Miata Location: Sarasota, FL Posts: 599 Thanks: 139 Thanked 151 Times in 110 Posts Mentioned: 4 Post(s)	Excellent points. Thanks.

01-10-2023, 11:19 AM	#8
Qwimby1 Senior Member Join Date: Nov 2015 Drives: 14 FRS Monogram, 05 Mazdasped Miata Location: Sarasota, FL Posts: 599 Thanks: 139 Thanked 151 Times in 110 Posts Mentioned: 4 Post(s)	When I say cold in Florida its all relative. We had a couple of 40 degree nights and then back to 70. It didn't change the starting situation. Now running 93 and it starts normally. I hadn't checked for a while, but what I was getting ran right at 85%.

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