HC ppm on a pontiac

I went and had an emissions done on my 1990 Grand am. i have replaced the
oxygen sensor, timing chain, fuel injectors, manifold, crankshaft sensor,
engine module, fuel filter, alternator belt and a few more things. The only
thing I haven't changed was the catalyric converter. I put a new muffler and
pipe on it 3 years ago. but never chnged the catalytic converter as the guy
said I didn't need one. everything passed except the HC ppm the reading was
207 allowed is 174. I noticed when the guy got in and revved the motor black
smoke can out of the pipe for a minute and then stopped. Could this be the
converter? Also I changed the EGR valve yesterday. Also when the car starts
first thing in the morning it stumbles. Could my converter be clogged up?

High HC's is usually raw fuel unburned in the exhaust, misfire, rich mixture
are some issues. A full scan and diagnosis for the rich condition is
required.
"cherger" wrote in message
>I went and had an emissions done on my 1990 Grand am. i have replaced the
> oxygen sensor, timing chain, fuel injectors, manifold, crankshaft sensor,
> engine module, fuel filter, alternator belt and a few more things. The
> only
> thing I haven't changed was the catalyric converter. I put a new muffler
> and
> pipe on it 3 years ago. but never chnged the catalytic converter as the
> guy
> said I didn't need one. everything passed except the HC ppm the reading
> was
> 207 allowed is 174. I noticed when the guy got in and revved the motor
> black
> smoke can out of the pipe for a minute and then stopped. Could this be the
> converter? Also I changed the EGR valve yesterday. Also when the car
> starts
> first thing in the morning it stumbles. Could my converter be clogged up?



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