Rich exhaust/mix in 93 lumina

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 no 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.

Check the fuel pressure a bad regulator could cause this, I believe you have
a map sensor, check for no vacuum to it, scan it and check the coolant temp
readings when warmed up.
"bsquared" > wrote in message
oups.com...
>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 no 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.
>



----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
----= East and West-Coast Server Farms - Total Privacy via Encryption =----

Whenever I have a problem like yours I like to get dynamic
readings, your car is OBD I but you might have a data stream feature
with a scanner. I would hook up a scanner and run car and you can look
at what computer is reading from sensors. Look for any unusual
readings at idle, during warm up etc. I have heard of bad fuel
pressure regulators as other poster said hook up a clear plastic tube
in place of black rubber vaccuum tube and look for any fuel in tube
(busted diaphram), it could be intermitant so look for a while under
various rpms.
bsquared wrote:
> 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 no 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.