is it normal for vehicle to blow a little bit of black soot when vtec has engaged? i have searching around and i have heard that while vtec has engaged, mixture goes to a full rich (100%) condition, causing the black soot. Is this true?

89 CRX with d16z6 engine 151xxx KM on the engine. could also use a tune-up, original wires, cap and rotor, and o2 sensor, worn plugs.

 

dude, do a tune up....

 

just finished it, still smoking...

 

it is a little normal because the ecu will dump more fuel when vtec kicks to check black smoke means you are running rich anyway and thats better than lean

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ndondahows &raquo;</TD></TR><TR><TD CLASS="quote">it is a little normal because the ecu will dump more fuel when vtec kicks to check black smoke means you are running rich anyway and thats better than lean</TD></TR></TABLE>

Are you running the motor OBD-1?

 

yes, converted from obd-0 to obd-1

black soot @ 6000+ rpm under hard acceleration.

and another question, the distributor rotor is held on by a screw/bolt, and seems very difficult to remove. I almost stripped it with a philips, any suggstions?

 

Try an Impact Screwdriver. Buy one, it's a great tool. You use a hammer with it. Best hand tool I've used.

 

i have one, but im afraid i may break the shaft, should be alright?

 

You're fine. Use it.

 

k thx