[Gmecm] 93 CHEVY g20 VAN

[Mike V]

I've encountered this when there was an exhaust system leak "before" the O2 
sensor.  ie; cracked cross-over pipe, etc.  This allow fresh air into the 
system at idle, which spoofed the O2 sensor into a lean reading.  A cracked 
ex-manifold
will do it.  Is the exhaust system tight & quiet?
MV

At 10:22 AM 12/30/2005 -0800, you wrote:

>93 CHEVY G20 VAN 5.0L  RUNS TOO RICH, I REPLACED PLUGS, CAP,ROTOR,WIRES, 
>O2 SENSOR,THROTLE BODY GASCKET,MAP SENSOR, I EVEN CUT THE CAT OUT TO SEE 
>IF WAS CLOGGED ALOT OF PARTS AND HAD THE CODES CHECKED ( NO FAULT CODES 
>FOUND) BLACK SMOKE , RUNS ROUGH, STALLS. ANY HINTS?
>_______________________________________________