Car can't start after parking overnight need help - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ok1886 · 01-06-2026, 05:56 PM

Hi people. Have a big issue here
17 Stock BRZ, aftermarket intake and OFT Stage 1 map, catback exhaust, never touched engine.
HKS Spark plugs changed in 120,000km, now is at 160,000km.
Now living in Saskatchewan
Car failed to start after parking overnight, can crank, battery full charged doesn’t help.
First time happened back in October, pulled engine out and found cylinder flooded by gasoline, cleaned up and drives well.
Just happened again, same symptom, car can crank but not starting. Any idea?
No error code found either.
I’m doubting about sensors or fuel system issue.
MAF? MAP? Leaking fuel injector?
I attached YouTube video link down here, took some videos including trying start the car, trying flood cleaning mode and reading OBD data through OFT tablet.
Many thanks.
https://www.youtube.com/playlist?lis...zWSJMvt5oiSMVy

DarkPira7e · 01-06-2026, 07:04 PM

If it's cold enough, your old battery on "full charge" really just may not be up to it. Is it the original? Do you have the original battery in it still?
Temp looked to read -18c.
I see fuel is full

Ohio Enthusiast · 01-06-2026, 08:48 PM

Nice videos. I would put the battery voltage on the OFT to monitor while it cranks.
Some of the attempts do sound like a weak battery, but that might have been due to you keeping cranking the car without it starting, as a few other attempts sound pretty healthy.
I would try booster cables or a booster pack to rule out the battery, other than that I can't help much.

blsfrs · 01-06-2026, 10:36 PM

Has you ruled out a spark issue? Spray a little starting fluid into the intake and see what happens.

ok1886 · 01-07-2026, 03:54 AM

Thank you for all replies, my original battery was done back in 2023, unfortunately the new AGM one was deeply discharged by the shop twice so it dies again after only two years, I bought a new battery today and now my car is back on road!

ok1886 · 01-07-2026, 03:55 AM

Quote:

Originally Posted by DarkPira7e

If it's cold enough, your old battery on "full charge" really just may not be up to it. Is it the original? Do you have the original battery in it still?
Temp looked to read -18c.
I see fuel is full

Thank you I bought a new battery to test today and I found the new battery from 2023 is done.

ok1886 · 01-07-2026, 03:56 AM

Quote:

Originally Posted by Ohio Enthusiast

Nice videos. I would put the battery voltage on the OFT to monitor while it cranks.
Some of the attempts do sound like a weak battery, but that might have been due to you keeping cranking the car without it starting, as a few other attempts sound pretty healthy.
I would try booster cables or a booster pack to rule out the battery, other than that I can't help much.

It is battery issue, I figured out today. Many thanks!

ok1886 · 01-07-2026, 04:02 AM

Quote:

Originally Posted by blsfrs

Has you ruled out a spark issue? Spray a little starting fluid into the intake and see what happens.

My car is back on road! It was battery issue, I didn't expect it dies in two years,

01-06-2026, 05:56 PM	#1
ok1886 Junior Member Join Date: Jan 2020 Drives: 2017 Subaru BRZ Location: Prince Albert, SK, Canada Posts: 8 Thanks: 0 Thanked 5 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Car can't start after parking overnight need help Hi people. Have a big issue here 17 Stock BRZ, aftermarket intake and OFT Stage 1 map, catback exhaust, never touched engine. HKS Spark plugs changed in 120,000km, now is at 160,000km. Now living in Saskatchewan Car failed to start after parking overnight, can crank, battery full charged doesn’t help. First time happened back in October, pulled engine out and found cylinder flooded by gasoline, cleaned up and drives well. Just happened again, same symptom, car can crank but not starting. Any idea? No error code found either. I’m doubting about sensors or fuel system issue. MAF? MAP? Leaking fuel injector? I attached YouTube video link down here, took some videos including trying start the car, trying flood cleaning mode and reading OBD data through OFT tablet. Many thanks. https://www.youtube.com/playlist?lis...zWSJMvt5oiSMVy

01-06-2026, 07:04 PM	#2
DarkPira7e Rust bucket enthusiast Join Date: Feb 2017 Drives: 2013 Turbo Firestorm FRS Location: Vermont Posts: 4,052 Thanks: 3,307 Thanked 4,202 Times in 2,111 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	If it's cold enough, your old battery on "full charge" really just may not be up to it. Is it the original? Do you have the original battery in it still? Temp looked to read -18c. I see fuel is full __________________ Turbo FR-S Build - Build Thread JDL EL Recirc manifold, Boostlab BL58x Turbo w/ T51R, 17x9 ARC-8, IAG block

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01-06-2026, 08:48 PM	#3
Ohio Enthusiast Senior Member Join Date: Apr 2020 Drives: 2018 BRZ Location: Dayton, OH Posts: 1,044 Thanks: 1,476 Thanked 875 Times in 506 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Nice videos. I would put the battery voltage on the OFT to monitor while it cranks. Some of the attempts do sound like a weak battery, but that might have been due to you keeping cranking the car without it starting, as a few other attempts sound pretty healthy. I would try booster cables or a booster pack to rule out the battery, other than that I can't help much.

01-06-2026, 10:36 PM	#4
blsfrs Senior Member Join Date: Dec 2018 Drives: 2013 frs base Location: central Virginia Posts: 1,440 Thanks: 2,684 Thanked 1,442 Times in 685 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Has you ruled out a spark issue? Spray a little starting fluid into the intake and see what happens.

01-07-2026, 03:54 AM	#5
ok1886 Junior Member Join Date: Jan 2020 Drives: 2017 Subaru BRZ Location: Prince Albert, SK, Canada Posts: 8 Thanks: 0 Thanked 5 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thank you for all replies, my original battery was done back in 2023, unfortunately the new AGM one was deeply discharged by the shop twice so it dies again after only two years, I bought a new battery today and now my car is back on road!

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