Does Mis-fire Actually Damage Anything?

[FROGGAH]

I have this exact same problem atm in my cefiro

i have a s1 rb25det running 10psi (it has been running 13psi) with fmic pod and 3" xorst i also have a 044 intank pump.

I put the car on our dyno at work last week to check afr's because i suspected a worn pump they sit nicely between 11.2 and 11.8 (std ecu which is weird) we are leaning towards coil pack, ignitor or afm as i have replaced plugs with .6mm gap down from .8mm. i am installing a new afm tomorrow so ill keep you posted as to what happens. ill also start changing coil packs in a few days if the afm doesnt solve the problem.

[chrissso]

I

I put the car on our dyno at work last week to check afr's because i suspected a worn pump they sit nicely between 11.2 and 11.8

I've noticed that at around 11, this is where the popping occurs.

11 is way to rich. 12 is considered a safe tune. 12.5 is supposedly right on, but look after your car etc. 13 is bad.

Min was getting into the high 10's and we retuned to 12, the difference was well worth it, and saved on fuel too.