there is black **** coming from my exhaust and its speckled on my rear bumper but im not burning any oil? so what is it then? I put on a different exhaust to see if it made a change and it did a little bit. Im going to get ngk iridium plugs which hopefully will help but other than that i dont know what to do. any suggestions?

 

black smoke is usually caused by overfuelling so id check the likes of the injectors first. is there much done with the engine??

 

your cat might be junk, your might also be running rich, any CEL's?

 

got the same thing in my EG. no clue what it is either.

 

does the car have a cat on?

 

i've got the same thing on my '93 hatch. its very annoying.

after i wash my car the rear is dirty within 30 minutes of driving...

it might have something to do with having aftermarket exhaust.
a tune might solve this issue i think.

 

Black = Fuel. Too rich. Check your fuel pressure, over pressure = black smoke. And check your injector's and your cat, black could also be caused because your cat is burned up and not burning excess fuel properly. Too rich is good when your romping on it though, means your motor will run cooler, leaner is running hotter but no smoke, black is running cooler with smoke.

 

If you hit VTEC alot, it will just be excess fuel, better rich than lean.

 

its non vtec i have a cat. it could be a p.o.s but i havent checked it out. im not throwing any cels but im gonna try plugs. my car is hesitating around 3000rpms i think my shitty plug(s) could have something to do with not burning up all the fuel. start with the cheapest parts first.

 

sounds like your on the right track, check o rings on your injectors as well

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by allshownogo &raquo;</TD></TR><TR><TD CLASS="quote">its non vtec i have a cat. it could be a p.o.s but i havent checked it out. im not throwing any cels but im gonna try plugs.</TD></TR></TABLE>

what year is the car? if its OBD1 your car wont throw a CEL for a bad cat because there is no secondary o2 sensor.

 

yeah it is obd1 only light in dash is srs but i painted that out. getting plugs from a friend and i will let you know. nkg the g series or whatever it is. he ran spray one em once but that shouldnt hurt anything. i dont think

 

Distributor.

 

ended up just buying plugs NGK G. the plugs i pulled out had a little bit of oil on them and were black some were really black... someone said piston rings. how much would that cost? is it worth it in a d15 or should i plan on swapping sooner than i wanted to? how long will it last if i dont do anything?