Running rich, white smoke & H2O collecting in exhaust tip

[Drewster]

Hi guys. First off, I have a stock KA24DE in a '91 240sx. A few weeks ago my car was idling badly, so badly that it would stall out sometimes, and running rich (or so I assumed, after smelling gas and seeing that my plugs were fouled up nice and black) so I searched around and decided cleaning out my IACV would remedy the problem. After cleaning w/ carb cleaner and using some Seafoam in the brake booster line (1/3 pt.) & fuel tank (1/3 pt.), the car ran great, and then I found out I had to take the car to get smogged. It failed NOx at 15 mph but the tech also found that my timing was too advanced (23b), so I decided I would retard the timing to 18b. After failing again, I decided I should clean out the EGR. I undid the plug on the intake manifold that leads to the EGR and cleaned it out with a brush. Afterwards I Seafoamed the car again, this time with 1/3 pt. in the brake booster and 1/3 pt. in the crank case. After admiring the beautiful cloud of white smoke coming from my exhaust, which I deemed normal because of the Seafoam, I realized that the smoke had thinned out a bit but was not stopping. In addition, my erratic idling came back including the random stalling, and things were smelling pretty gasoline-y again. Soon I also realized that water was collecting in my exhaust tips; enough that it didn't look like just little beads of condensation, but mini-puddles in the corners of the exhaust tips (like maybe a teaspoon?). Checked my plugs, and they were black again. I suspected a blown head gasket and also checked compression, the results of which are as follows:

Cyl 1: ~180 psi
Cyl 2: ~180 psi
Cyl 3: 175 psi
Cyl 4: ~180 psi

To me, these numbers look good. I do not know how good of an indicator a compression test is for a blown head gasket, but I always thought bad compression + white smoke = blown head gasket. I am not sure if my coolant level is dropping, but I will be sure to check that the next time I run the engine for a while.

I've been searching for anyone with similar problems, but I can't seem to find any that fit my description exactly. However, I have found some threads involving parts of the problems I am experiencing, so I have a few ideas in mind. I don't want to post them up yet, for fear of biasing anyone's ideas. If anyone has any ideas, please help! If more information is needed I can readily provide it.

Thanks so much,
-Andrew

[nissan2.4]

Try and do a fuel pressure test, the injector o-rings could be bad and leaking through causing it to run extremely rich, i had the same problem with my ka, ur pressure regulator could also be bad. If u dont have access to fuel pressure gauge just removed ur fuel rail with fuel lines attached and have someone turn ignition on to pressurize fuel system.