Hey guys, I am new to the Vtec world. Just bought a Si and sometimes when my Vtec kicks in I get a cloud of black smoke. What could that be from?

Thanks

 

Burning oil ?? Valves, or piston rings I am guessing......

 

Running rich or burning oil.. burning oil the smoke will have a tint of blue to it..

 

no blue that I can tell, just BLACK!! really really black!!

 

i dont think the smoke is because of Vtec engaging. since youre normally at full throttle when in Vtec, its probably just running a little rich. it doesnt sound like anything to worry about.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlckSI &raquo;</TD></TR><TR><TD CLASS="quote">no blue that I can tell, just BLACK!! really really black!!</TD></TR></TABLE>

Sounds normal to me. It probably just running a little rich and its nothing to worry about.

 

mine does the same thing.

 

No worries, it is normal for the JDM motors to do that. I have a B-18C, and all of my friends that have Japanese DOHC's have the same perdicament! Plus it is fun, get this... if you beat a car that trys to race you, he will have black **** all over his car for fucken with u! ;}

 

especially with a test pipe

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ScottFern &raquo;</TD></TR><TR><TD CLASS="quote">Burning oil ?? Valves, or piston rings I am guessing......</TD></TR></TABLE>
holy **** dont scare the kid.

the little puff of black smoke at vtec is normal, its just excess fuel being expelled out the exhaust when vtec engages.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EM1b18cR &raquo;</TD></TR><TR><TD CLASS="quote">

Sounds normal to me. It probably just running a little rich and its nothing to worry about.</TD></TR></TABLE>what he said

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kamin &raquo;</TD></TR><TR><TD CLASS="quote">
holy **** dont scare the kid.

the little puff of black smoke at vtec is normal, its just excess fuel being expelled out the exhaust when vtec engages.</TD></TR></TABLE>Good call Kamin, when will these idiots stop posting ignorant info?

 

Agreed w/ the rest.. I was running rich due to Mugen program.. Makes vtec rich like Bill gates!
So all this freakin carbon collects.. in your muffler.. and gets all over the bumper..
You may start throughing a check engine light... for your O2 sensor from all the carbon / richness.. You would see a orange engine light.. come on of course..then if you were to check the code at the pinout.. you would get a # 1 (one quick flash periodically.. and nothing else)
But check your oil Frequently You may be using a "lil" with rich condition.. its wise to check it Everytime you fill for gas! I went into oilstarvation and lost my rod bearings... bye bye high compression b17a

 

my GS-R gets a **** load of black carbon out the exhaust. when we opened up my cover i saw my pistons were burnt and my rings were done. after i got a new set of b18c pistons... the black **** is still coming out, and its makin my bumper look oooglay, is there ANY WAY to stop that **** from coming out?! i dont have a JDM motor. Also, i hear a big POP sound when i **** gears (sometimes), is it my engine back firing? late

 

rich is better than lean my friend...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlackNoise &raquo;</TD></TR><TR><TD CLASS="quote">rich is better than lean my friend...</TD></TR></TABLE>

yeah, he's right, but not too rich

 

dude i have the same car, and i have the same issue. i was told it wasnt a big deal and it happens with larger exhausts... no big deal, just more noticeable now

 

If you run really rich u can shoot flames.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blykins &raquo;</TD></TR><TR><TD CLASS="quote">If you run really rich u can shoot flames.</TD></TR></TABLE>
not with a catalytic converter

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kamin &raquo;</TD></TR><TR><TD CLASS="quote">
not with a catalytic converter </TD></TR></TABLE>

That cat won't last very long with super rich conditions......

My 99 B16A2 sometimes gives a black emission at WOT and redline, not so much at VTEC engagement. I was surprised on the dyno where there was NO black puffs at all even at the top end. My buddy videotaped it, but I don't have the film handy.....

Steve

 

mine does the same ****

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EF9_SiR &raquo;</TD></TR><TR><TD CLASS="quote">Good call Kamin, when will these idiots stop posting ignorant info?</TD></TR></TABLE>

exactly. funny thing is when I first got mine going, I had a white car behind me unsuspecting and bamn.............black hood. I was like oops.