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.

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

My car's running on ecutek.

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

Fouled plug will eventually throw a CEL code.

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

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

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.

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:thumbsup: