Car Driving Rough (misfiring) - Page 4 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

steve99 · 07-30-2017, 09:10 PM

If 3 was noticably darker than 1 then it suggests a problem with 3. It looked a bit dark to me, but hard to tell from photo.

Its possible that its either not firing spark plug correctly or the 3 injector is leaky/defective and its running rich on that cylinder as a result

you done coil and plug, so swapping 1/3 injectors and see if misfire starts on 1.

Its then possible its leaky damaged direct injector, but thats a crap load of work and expense and you would not want to do that without proper diagnosis. They are matched set and all seals and fuel rails should be replaced if removed.

alter that its looking difficult like weird wiring fault

looks like shop time

http://www.ft86club.com/files/BRZwiringi.pdf

steve99 · 07-30-2017, 09:12 PM

Quote:

Originally Posted by Sojhinn

Interesting fired it back up and noticed at first stft were at -10 and after idling for 2 mins they went 0 and the ltft went to -10
@steve99

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at startup /warmup their the maf offset tsable that enrichens fueling, so the trims are a bit eratic after startup, check when its fully warmed up

Icecreamtruk · 07-31-2017, 08:44 AM

For what is worth. I've had problems with P0351 (coilpack cylinder 1) for the last 2 years. My car is NA and on gas really not an apples to apples problem, but when the code would show up it would iddle like crap. Last time I changed the coil, I decided to look at the plugs, my plug on cylinder 1 looked like yours, while the rest were not as black. After the last time I changed it, I had a problem with the vtt sensor (P0016). It was only the sensor, and swapping to a new one fixed the issue. But another coilpack has gone by since that. It looks to me like something isnt right somewhere else and the consequence (not the cause) is the coilpack failing, or the vt sensor failing as well, both could result from extra heat on cylinder 1. I do not know the source of my problems, I cant really diagnose it since changing the coilpack seems to magically fix everything, so I think Im stuck with it.

I saw somewhere that there is a very recent service bulletin for 2013-2014 cars to change out their wirning harness and coilpacks to the newer version (2015-2016) because there is an issue where they get loose and cut connection. I think your next logical step is to disconnect the coilpack and mesure the voltage, current and resistance of everything in between the ECU and the coilpack itself, including connectors and wires. It could be as simple as a burnt wire not transmitting an stable signal. I didnt see any post about you testing connections (altho I skimmed over your thread rather quickly), so maybe try that next since its easy.

Good luck on your search.

Sojhinn · 07-31-2017, 11:39 AM

Swapped cylinder 1 & 3 injectors. Same issue on cylinder 3.

So that leaves weird wiring issue, mechanical issue for cylinder 3 (valve or something) , or di system.

Taking it a shop this morning. Thanks for all your help guys. I'll make sure to respond with the solution.

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Sojhinn · 07-31-2017, 06:01 PM

No compression cylinder 3.

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humfrz · 07-31-2017, 07:34 PM

Quote:

Originally Posted by Sojhinn

No compression cylinder 3.

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Oh, my ...... that's not good ......

Well, at least you know why it's running poorly.

You might have to trailer that puppy up here ....... or fly back down to pick it up later ......

humfrz

Sojhinn · 07-31-2017, 07:44 PM

Quote:

Originally Posted by humfrz

Oh, my ...... that's not good ......

Well, at least you know why it's running poorly.

You might have to trailer that puppy up here ....... or fly back down to pick it up later ......

humfrz

I have the car at shop down here. (JuJu Built) Working on plans. Leak down test pointing to intake valves. If that's the case going to build the heads.

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Chronology · 07-31-2017, 08:18 PM

Quote:

Originally Posted by Sojhinn

I have the car at shop down here. (JuJu Built) Working on plans. Leak down test pointing to intake valves. If that's the case going to build the heads.

Sent from my iPhone using Tapatalk

Glad you got in the shop today. I'm sure they will pull it and open it up today, fingers crossed on the best of the worst case.

Sojhinn · 07-31-2017, 08:24 PM

Quote:

Originally Posted by Chronology

Glad you got in the shop today. I'm sure they will pull it and open it up today, fingers crossed on the best of the worst case.

Thanks again bro. I really appreciate everything you did.

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Sojhinn · 08-01-2017, 05:20 PM

While I'm waiting for the engine to be pulled. Anyone want to daydream and come up with some ideas for some awesome parts to put in?

Dru670 · 07-31-2018, 02:05 AM

Quote:

Originally Posted by Sojhinn

While I'm waiting for the engine to be pulled. Anyone want to daydream and come up with some ideas for some awesome parts to put in?

So...got it figured out?

ojuniour · 09-12-2023, 05:32 PM

Quote:

Originally Posted by Dru670

So...got it figured out?

This dude bounced after all that.. hope he's doing weel... what a waste of thread.

07-31-2017, 11:39 AM	#46
Sojhinn Lightning McQueen Driver Join Date: May 2012 Drives: Limited Red 6MT BRZ Location: San Diego Posts: 2,242 Thanks: 753 Thanked 1,167 Times in 644 Posts Mentioned: 77 Post(s) Tagged: 2 Thread(s)	Swapped cylinder 1 & 3 injectors. Same issue on cylinder 3. So that leaves weird wiring issue, mechanical issue for cylinder 3 (valve or something) , or di system. Taking it a shop this morning. Thanks for all your help guys. I'll make sure to respond with the solution. Sent from my iPhone using Tapatalk __________________ Nicknamed Lightning by my Kids. Installed Mods: Phantom Electric Super Charger \| Open Flash Tune \| Perrin OP/ HFC Front pipe \| Invidia Q300 catback \| ST Suspension \| JDL Header \| Flex Fuel

07-31-2017, 06:01 PM	#47
Sojhinn Lightning McQueen Driver Join Date: May 2012 Drives: Limited Red 6MT BRZ Location: San Diego Posts: 2,242 Thanks: 753 Thanked 1,167 Times in 644 Posts Mentioned: 77 Post(s) Tagged: 2 Thread(s)	No compression cylinder 3. Sent from my iPhone using Tapatalk __________________ Nicknamed Lightning by my Kids. Installed Mods: Phantom Electric Super Charger \| Open Flash Tune \| Perrin OP/ HFC Front pipe \| Invidia Q300 catback \| ST Suspension \| JDL Header \| Flex Fuel

08-01-2017, 05:20 PM	#52
Sojhinn Lightning McQueen Driver Join Date: May 2012 Drives: Limited Red 6MT BRZ Location: San Diego Posts: 2,242 Thanks: 753 Thanked 1,167 Times in 644 Posts Mentioned: 77 Post(s) Tagged: 2 Thread(s)	While I'm waiting for the engine to be pulled. Anyone want to daydream and come up with some ideas for some awesome parts to put in? __________________ Nicknamed Lightning by my Kids. Installed Mods: Phantom Electric Super Charger \| Open Flash Tune \| Perrin OP/ HFC Front pipe \| Invidia Q300 catback \| ST Suspension \| JDL Header \| Flex Fuel

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07-30-2017, 09:10 PM	#43
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,998 Thanks: 1,035 Thanked 4,987 Times in 2,981 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	If 3 was noticably darker than 1 then it suggests a problem with 3. It looked a bit dark to me, but hard to tell from photo. Its possible that its either not firing spark plug correctly or the 3 injector is leaky/defective and its running rich on that cylinder as a result you done coil and plug, so swapping 1/3 injectors and see if misfire starts on 1. Its then possible its leaky damaged direct injector, but thats a crap load of work and expense and you would not want to do that without proper diagnosis. They are matched set and all seals and fuel rails should be replaced if removed. alter that its looking difficult like weird wiring fault looks like shop time http://www.ft86club.com/files/BRZwiringi.pdf

07-31-2017, 08:44 AM	#45
Icecreamtruk Senior Member Join Date: Dec 2015 Drives: Track preped NA FRS Location: Montreal, Canada Posts: 987 Thanks: 1,056 Thanked 680 Times in 405 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	For what is worth. I've had problems with P0351 (coilpack cylinder 1) for the last 2 years. My car is NA and on gas really not an apples to apples problem, but when the code would show up it would iddle like crap. Last time I changed the coil, I decided to look at the plugs, my plug on cylinder 1 looked like yours, while the rest were not as black. After the last time I changed it, I had a problem with the vtt sensor (P0016). It was only the sensor, and swapping to a new one fixed the issue. But another coilpack has gone by since that. It looks to me like something isnt right somewhere else and the consequence (not the cause) is the coilpack failing, or the vt sensor failing as well, both could result from extra heat on cylinder 1. I do not know the source of my problems, I cant really diagnose it since changing the coilpack seems to magically fix everything, so I think Im stuck with it. I saw somewhere that there is a very recent service bulletin for 2013-2014 cars to change out their wirning harness and coilpacks to the newer version (2015-2016) because there is an issue where they get loose and cut connection. I think your next logical step is to disconnect the coilpack and mesure the voltage, current and resistance of everything in between the ECU and the coilpack itself, including connectors and wires. It could be as simple as a burnt wire not transmitting an stable signal. I didnt see any post about you testing connections (altho I skimmed over your thread rather quickly), so maybe try that next since its easy. Good luck on your search.

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