Rich Exahust (gas Smell) in 93 lumina 3.1

I have a 93 Lumina Euro 3.1 with rich smelling exahust created by
runnig way too rich.
Exahust is black in color and has an almost in between gas/vinegar
odor. Low power seems like it is runing on two cylinders. Some more
background engine has been locked up. However, compression is still
seemingly fine acording to haynes manual 115-120 PSI on first comp
stroke. After unseizing engine it ran fine for a few months delivering
mail on a rural route (yikes!). Catalytic converter has been suspect
and eliminated.
Trouble Codes:
15: Colant Sensor low (Replaced)
23: IAT Sensor in this model (Replaced)
35: Idle Speed error replace IAC (Replaced)
43: Electronic Spark Control/Knock Sensor
(Replaced)
53: EGR Valve (Not Replaced but cleaned and new
gaskets noo longer
Leaking)

Also new plugs, wires and coils.

Also two weeks ago i was cheking the ignition system control module
with test in haynes manual and all cheks out. After doing that I
cleaned up the spark pulgs again (they foul in about ten minuteswith
carbon) I hooked everything up and started it and it ran fine for two
hours thourgh various performance ranges. Next morning pull #2 Plug and
it looked cleaner than when I put it in the night before, put it back
and try to start and same problem starts again running rough and rich
exhaust. Talked to some one who works at
ford as a mechaninc and he said try the O2 sensor. I did and no change.
I have tried to eliminate as many possibilites as I can but this seems
to be and intermitant problem (our favorite kind) and like that friday
evening if the stars are all alinged (which has nothing to do with it )
she runs. Any more suggestions.

 

Lumina is a Chebby, not a Chrysler.

Larry
Behold Beware Believe

 

oinched wires under the intake or a bda injector and they can and do shut
down pcm so the won't run a long time or are very hard starting

 

Hi. I had this rich smelling exhaust plus lack of power problem on my
87 Reliant. After trying a few things I replaced the MAP sensor and the
problem reverted incredibly. Exhaust is normal now, power is too and
mileage doubled in a blink of an eye.

I had no clue pointing to the MAP sensor, but 'fortunatey' it stop
working completely so I the car wouldn't start if the sensor was
connected. Therefore I had to replace it and realised that this was the
problem.

Good luck..
Claudio