another octane related question

[JDMH22ACB7]

hmmm... not that iv'e ever heard of...Do you have a catalytic converter?do you have a FPR?black smoke is usually fuel not fully burnt AKA running rich.

[NAiL05]

Mid grade is fine. Thats what I used when I ran my a6. So how do your spark plugs look?

[owequitit]

not sure, i need to pull them tomorrow at work, if they are fouled up too bad i'll be able to buy new ones really cheap, but i've been running rich for sure. do you think knocking it back down to 87 octane would cure this a bit?

Not likely. It is more likely that you have a sensor that isn't doing so hot.

[owequitit]

good call, thats one more thing i need to look into, my suspension and exterior are coming together, but the last 4 years at school were torture on my motor, so i need to get that back in line before i start to do anything big to it, i'll start checking sensors and seals when i have free time

Keep me posted. I would start with the O2 myself, and work from there.

CB7s, like most Hondas, go richer as you do stuff to them, instead of leaning out. At least until you reach the capacity of the injectors.