Spark plug failure - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

BRZ68 · 06-05-2017, 06:06 PM

Has anyone experienced a spark plug failure on our fa20? Did it cause any rough idling or some sort driveability issue other than a loss of power?

My turbo brz runs fine and reaches full boost but NO power. It feels like NA power to be exact and i dont feel any other symptoms other than power loss and fuel running rich.

I'm suspecting a fouled plug or maybe a faulty map sensor.

stevesnj · 06-05-2017, 06:27 PM

did you put on a tune in the ECU or just put a turbo on?

BRZ68 · 06-05-2017, 06:34 PM

My car's running on ecutek.

Kodename47 · 06-05-2017, 06:40 PM

Then a log would help. It could be many things, you'd know if you were misfiring.

humfrz · 06-05-2017, 09:31 PM

Quote:

Originally Posted by Kodename47

Then a log would help. It could be many things, you'd know if you were misfiring.

Yep, I reckon on a 4 cylinder engine, if you had one bad plug (or COP) the engine would be trying to shake itself out of the engine compartment.

humfrz

Gforce · 06-05-2017, 09:36 PM

Fouled plug will eventually throw a CEL code.

BRZ68 · 06-06-2017, 10:01 PM

Quote:

Originally Posted by humfrz

Yep, I reckon on a 4 cylinder engine, if you had one bad plug (or COP) the engine would be trying to shake itself out of the engine compartment.

humfrz

I'm not sure if a fouled plug will show any signs of shaking. Only power loss and high gas consumption are the only symptoms. I will get a datalog soon and send to my tuner

OND · 06-06-2017, 11:07 PM

For what it's worth, a single cylinder misfire was very noticeable during idle in my S14. It was rough and unstable.

Icecreamtruk · 06-07-2017, 10:26 AM

I might be able to help here. I changed a coilpack and sparkplug recently, front passanger side. Code thrown was P0351. I had it before last year and I changed the coilpack and gold taped all of them to avoid it happening again. Then when the same code came up again I figured it couldnt be just the coilpack, why would the same one (which is 3 years newer than the rest) fail again. So I changed both and the sparkplug was very burn, and had one of the two side tips slightly bent.

The syntomps were the engine iddling pretty rough, shaking itself to the point it would shake the whole car. Loss of power of course but not by a whole amount (maybe 20-30hp). The car is NA with exhaust + Ecutek tune, 45k miles, and is driven hard at the track fairly often (once every two to three weeks).

Hope this helps.

Edited: btw, code only shows up at the track, when street driven the code would go away on its own, and only come when revving past 6k.

BRZ68 · 06-12-2017, 07:44 AM

Update: I changed the spark plugs and regained all the power loss (about 100+ whp). Word of advice is it's not all the time that we experience misfiring when the plugs need to be changed

06-05-2017, 06:06 PM	#1
BRZ68 Member Join Date: Mar 2013 Drives: BRZ m/t Location: Metro Manila Posts: 61 Thanks: 56 Thanked 11 Times in 8 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Spark plug failure Has anyone experienced a spark plug failure on our fa20? Did it cause any rough idling or some sort driveability issue other than a loss of power? My turbo brz runs fine and reaches full boost but NO power. It feels like NA power to be exact and i dont feel any other symptoms other than power loss and fuel running rich. I'm suspecting a fouled plug or maybe a faulty map sensor.

06-05-2017, 06:27 PM	#2
stevesnj Senior Member Join Date: May 2013 Drives: 2016 FR-S Oceanic Blue Location: Southern NJ Posts: 2,958 Thanks: 2,158 Thanked 1,601 Times in 923 Posts Mentioned: 30 Post(s) Tagged: 2 Thread(s)	did you put on a tune in the ECU or just put a turbo on? __________________ My 2016 Build thread TRD Exhaust with custom quad tips, TRD Lowering Springs,TRD Quick shifter,LED;DRL, Projectors, and turn signals. Re-badge, 86 Nanny, WinmaxW2 Pads, K&N Drop In, Antenna delete

06-05-2017, 06:40 PM	#4
Kodename47 Senior Member Join Date: Oct 2012 Drives: UK GT86 Location: UK Posts: 3,040 Thanks: 185 Thanked 1,629 Times in 1,112 Posts Mentioned: 155 Post(s) Tagged: 1 Thread(s)	Then a log would help. It could be many things, you'd know if you were misfiring. __________________ .: Stealth 86 :. Abbey Motorsport/K47 Tuned Sprintex 210 Supercharger Kodename 47 DJ: Soundcloud / Instagram / Facebook

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06-05-2017, 06:34 PM	#3
BRZ68 Member Join Date: Mar 2013 Drives: BRZ m/t Location: Metro Manila Posts: 61 Thanks: 56 Thanked 11 Times in 8 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	My car's running on ecutek.

06-05-2017, 09:36 PM	#6
Gforce Banned Join Date: Mar 2017 Drives: 2013 Subaru BRZ Location: Alberta Posts: 519 Thanks: 39 Thanked 161 Times in 109 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Fouled plug will eventually throw a CEL code.

06-06-2017, 11:07 PM	#8
OND Senior Member Join Date: May 2016 Drives: 2023 BRZ Location: Houston, TX Posts: 208 Thanks: 174 Thanked 219 Times in 90 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	For what it's worth, a single cylinder misfire was very noticeable during idle in my S14. It was rough and unstable.

06-07-2017, 10:26 AM	#9
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)	I might be able to help here. I changed a coilpack and sparkplug recently, front passanger side. Code thrown was P0351. I had it before last year and I changed the coilpack and gold taped all of them to avoid it happening again. Then when the same code came up again I figured it couldnt be just the coilpack, why would the same one (which is 3 years newer than the rest) fail again. So I changed both and the sparkplug was very burn, and had one of the two side tips slightly bent. The syntomps were the engine iddling pretty rough, shaking itself to the point it would shake the whole car. Loss of power of course but not by a whole amount (maybe 20-30hp). The car is NA with exhaust + Ecutek tune, 45k miles, and is driven hard at the track fairly often (once every two to three weeks). Hope this helps. Edited: btw, code only shows up at the track, when street driven the code would go away on its own, and only come when revving past 6k.

06-12-2017, 07:44 AM	#10
BRZ68 Member Join Date: Mar 2013 Drives: BRZ m/t Location: Metro Manila Posts: 61 Thanks: 56 Thanked 11 Times in 8 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Update: I changed the spark plugs and regained all the power loss (about 100+ whp). Word of advice is it's not all the time that we experience misfiring when the plugs need to be changed

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