My friend was driving his car and following me, and he told me that everytime I'm pushing my Talon, that there were lot of smoke getting out of the exhaust. So we exchange car, and I saw a lot of black smoke out of the exhaust. Here is my setup:

- Stock Injectors
- 14B turbo, at 15 PSI with MBC
- Stock ECU
- Pressure test the intake, and there is no leak, cause I fix everything, changed the throttle body shaft seals, JB weld the intercooler inlet and outlet, changed the fuel injector insulator, etc.
- New sparksplugs, wires, O2 sensor
- MAF is not hacked, I only remove the round yellow filter

Is there a way I can tune the fuel delivery. I've heard people on this board playing with a screw on the MAF, is that my solution?

I also noticed people that are concerned about a small leak, but never heard about people being concerned about the little air leak done by the bleeder valve on the ball & spring MBC.

If there is a lot of smoke you are either burning oil or running really rich.
At 15psi with the stock fuel system, I'd say you would be more on the lean side of things.

Excessive blow-by will cause oil to enter the intake via the valve cover breather tube. Check the intake tube to the turbo for oil. While that tube is off, check the compressor for play. There should be very minimal up/down play and no visible in/out play. Otherwise, it could be your turbo leaking oil into the intake/exhaust.

Do a compression test. If you have lost significant compression due to worn rings, you will let oil enter the cylanders and it will be burnt off.

Black smoke = running rich
Blue smoke = burning oil

Do a comp test anyways, 140-164psi is healthy, 120-139 the the motor is worn, anything below and it needs rebuild. If you see ****ty compression do a leak down test to determine where compression is escaping.

Allready did a compression test, and it's 160 through all cylinders. The blow-by shouldn't get in the intake, since I plugged a small breather filter, and also one at the purge solenoid. I know that I have probably a small leak of oil from the turbo, since I've seen a small thin film in the intake manifold, when I changed the shaft seals, but it's not enough...and also, I'm not seing blue smoke at all, it's really black smoke.

you just have an intake leak,

fix that and it will be fine.

our cars run really rich stock. They will do that.

do your basic maintainance, clean your intercooler out, check for boost leaks, check/repair any ignition problems.

It will probably still do this. You can do a bit of maf work, and solve it. You should run a logger to see exactly what you are doing, but it it will be ok if you just do some small things.

Back out the screw, take out the lower honeycomb, cut the airbox up a bit.

That should lean things out a bit.

John, yes technically that should lean thigns out somewhat, but what fi the leak is after the maf somewhere, ex. intercooler pipe, or tb, in maifold etc.
All that is going to do is make the smoke even more prominent, since the maf is reading more air, therefore compensating with even more fuel.

My buddy had lots of smoke from his exhaust when his turbo seals went on his old 14B.

Also, if you have an intake leak after the MAF woulden't you be running leaner rather then rich since your getting extra air into the engine?

Lean in vacuum (idle).
But what do you think happens when the intake is pressurized? Air goes out, not in.

Unless you mean a leak between the MAF and turbo.
That would indeed lean it out even under boost.

You guys are talking about an intake leak, but like I said in my first post, I allready pressure tested the intake for leak, and I'm telling you, there is no leak at 20PSI. Well, I believe that it should be my turbo seals, but I would believe that the smoke should be blue instead of black...