DaInFaMMuS1

whassup fellas, quick question. The other night me and my boys were doin some highway runs, and they commented that when in front of them and i downshifted, black smoke came outta my muffler. Since my 02 sensor is out, i was wondering if that could be the cause of my foul emmisions. any ideas? i plan to change my sensor soon, being that its throwin a check engine code now, and the tips of my magnaflow are black with soot/carbon or whatever that is

wilp99

thats just fuel not gettin burned from the jump.. prolly from the bad o2...

hondasir

maybe your short on engine oil?. or rich fuel?.

ajtcl

With the failed O2 sensor, your engine is not completely burning the fuel. Your ECU is compensating with a rich mixture and it is probably not advancing the timing enough to burn all the fuel. Replace the sensor and reset the ECU, you will probably be fine... Oh, do it soon though, or your CAT will get gummed up with varninsh from the unburned fuel building up. If you are seing on your tips, it is worse inside the CAT.

CL2.3-Amature

When I get on it hard and bang gears I get alot of black smoke, so I'm told. I also notice alot of deposit on my muffler. I believe my O2 sensor is fine though. No warning lights on my dash are light up. I have a OBX header, 22" resonator and a magnaflow muffler.

ajtcl

When is the last time you changed your spark plugs?

CL2.3-Amature

Sorry to whore on Dainfammus1's thread but I have changed mine approx 10k miles ago.

bkmc24

well, if it was when you were shifting, eveyone has a little black smoke at that time.

BlueCLRycR

i have smoke when shifting but its not black its kinof a light grey to medium grey.and my o2 sensor has thrown a code since i put on my cat back about 4-5 months ago(cant remember exactly.)