2G Black Smoke

[knucks3man]

How common or normal is it for a talon (2g) to smoke black?

stock turbo, str8 pipe exhaust all the way back. No cats, nor mufflers.

 

[Tifflusk]

Here are some pics, I am not very familiar with the car I bought it from someone, that bought it from someone else, who did all the work and installs. The actual person that I bought it from knew nothing also. Thats why it is at a shop being worked on, that is supposed to specialize in DSM's. They don't know what is wrong either.....

 

[totaleclipse_05]

Looks like you have an SFMU setup. Trace all the lines back and let us know where they connect to. Make sure it's all hooked up right.

 

[Blitzeclips]

Looks like you have an SFMU setup. Trace all the lines back and let us know where they connect to. Make sure it's all hooked up right.

It's either an FMU or SFMU. If that is the case, I would check the disc ratio in it. You may be leaning out or as it seems, running super rich due to the incorrect ratio for your current set-up.

 

[Tifflusk]

How do you check the disc ratio in it? What does that mean?

 

[Blitzeclips]

How do you check the disc ratio in it? What does that mean?

Inside the SFMU or FMU (whichever you have) theres a little disc regulating the amount of fuel pressure your set-up requires under vacuum. That means there's a specific amount of fuel being added to the system under vacuum.

The disc within this unit is interchangable is it is an SFMU (Super Fuel Management Unit). You change the discs based on the fuel pressure needed for certain amounts of boost. If you have the incorrect disc in there, you're fuel pressure may rise or fall beyond what is needed. Meaning you could be running very rich or very lean, creating the smoke you see alot.

You can call VORTECH or whichever company manufactures the unit, and have them guide you into the right size disc for your set-up. But I am almost certain that is the cause. If the mechanic has tried about everything else, print this up and have him take a look at what I just said.

 

[totaleclipse_05]

I am pretty sure Vortech has all the info about their disc ratios and springs for the SFMU on their website also.

 

[erald01]

i know our cars are known for blowing smoke out the exhoust when u lounch it, but i was wondering is there an explonation for that?

 

[92AndAHalf]

Mine blows a little black smoke when I step on it from a slightly rich fuel mixture. Could also be a little carbon build up from constantly idling the car to allow the turbo to spool down. My 2 cents.

 

[1gDSM4g63]

Yeah, definite running too rich causes black smoke. Unused gas is burn up and flow through your exhaust

 

[NeilR777]

I have a 1995 talon tsi awd, stock everything except aftermarket cold air intake. When I idle it smokes a little, but when I get on it a lot of smoke comes out of the back, sometimes black, sometimes blue, sometimes white. My pipe has alot of black stuff on it that I can rub it off with my fingers. What could this be?

Note: Car has 151,000 miles on it.


Thanks,
NeilR777

 

[NeilR777]

Anybody know?

 

[cc4ever]

Smell the exhaust. See if it is sweet like coolant, smells like fuel, or smells like burnt oil. You are probably burning oil though. The are three main ways you are doing this, bad turbo, bad rings, or bad valve seals. To check the turbo take off the intake pipe and see if there is play in the bearings. Also take off the charge pipe to the turbo and see if there is oil in the pipe or in the compressor housing of the turbo. To check the piston rings compression test them. If one of them is very low, add a little oil in the chamber and see if compression rises. If your rings and turbo are good, then it is probably your valve seals. It is only $20 for the seals and since you have 150,000 miles on your car it wouldn't hurt to do it anyways.

 

[NeilR777]

Well, we didnt replace the valve cover gasket, and then we siliconed it, which made the rings under the spark plugs fall off so its leaking oil out of the top of the cover now. Could this cause it?

 

[fastandlow94]

no the oil leaking would have to make it into the combustion chamber which would cause it to smoke blue... bad valve seals would allow excessive amounts of oil down past the valves and into the combustion shamber also causing it to smoke blue... and with 150,000+ miles new valve seals are a cheap fix. a sweet smell with white smoke is a sign of coolant making it into the combustion chamber. a black smoke is unburnt fuel in the exhaust. some black smoke is good its better to run to rich then to run to lean which will cause the vehicle to run HOT. the black in the exhaust is normal and will not hurt anything

 

[AKGEN1DSM]

Well it depends where the oil's leaking onto, if its on something hot like the exaust mani, then yea thats definetly a possibility, but definetly check your compresssion.

 

[NeilR777]

It is fuel. I smelt it and it is fuel for sure. It smokes ALOT now though, at idle I can see it and when I rev it up there is alot more. My dad tested it and it smells like fuel, its just white smoke that evaporates after about 3 seconds into the air. My guess is it is running rich because I dont get very good mileage either. I was wondering if my motor could have been rebuilt sometime in the car's life, we don't have any of the papers, but is it likely if the motor runs good and is at 152,000 miles that it WAS rebuilt once before? The O2 sensor is putting up a check engine light, could that make it burn rich if the O2 sensor was not functioning correctly?

Also another question, I have an aftermarket boost guage, and when I put the pedal to the floor, it boosts to about 12 PSI but then when I keep it the the floor it goes down to 8-9 and stays there, which means its not pulling full boost... now this could either be a faulty boost guage that spikes when I floor it, or there could be something else wrong, any ideas?

 

[ETalon95]

I had a 14b installed. It doesnt pull until 5500rpms and as soon as it spools is blows out tons of black smoke. During idle and lower rpms terrible exhaust fumes come out of the exhasut. I did a boost leak test and fixed all the boost leaks. I bought a MBC from SBR and hooked that up and it doesn't regulate the boost at all. I hooked up a 1000 different ways and the turbo just keeps spooling until fuel cut. Any suggestions? I searched so many threads and everyone says its juts a boost leak, plugs or O2 sensor. Anything else?

I also have CEL reading fuel trim malfunction (bank 1). I understand that this is caused by running rich/lean. Everyone is saying that its my O2 sensor, but I just replaced it last year. The CEL went on a few hours after the new turbo was installed. Do you think the O2 sensor is faulty? How do i know?

 

[TwoLiterLaser]

You can test the O2 sensor with a logger or scanner that allows you to see in real-time what the O2 sensor is reading. If it is reading a steady value and not changing much when the engine is revved then it is bad, if it is reading a wide range of voltages when the engine is revved then you know it is still good.

Does that turbo have a wastegate? Is the wastegate functioning? What pressure is the wastegate set for?

The fuel trim malfunction could be caused by the turbo running the fuel system into cyt-off, it could be caused by a vacuum leak at the intake manifold. But since you fixed the boost leaks, I doubt you still have a vacuum leak.

Check that wastegate and get back to us.

 

[ETalon95]

How do i tell if the wastegate is working properly? As of right now the car is way to hot to play with right now. I can check it tomorrow before class.

 

[viprez586]

Your late spool could be caused by a bad wastegate. or the wastegate flapper seat is cracked badly that it doesnt seal closed and build boost pressure hence the late boosting.

 

[jongreene]

What kind of fuel mods are done to the car?

 

[laserspeeddemon]

Black smoke is a indication of either fuel or oil is being burned.

Assuming you installed a used 14b, I would say that your turbo is shot. Burnt oil residue on the 02 sensor will cause it to foul within a few days, even a new 02 sensor (depending of the amount of oil being passed through the exhaust).

To test to see if your boost creep problem, the first thing you should do is hook your boost source directly to your wastegate actuator. If you are still getting boost creep, remove your actuator altogether, if you are STILL getting boost creep, then the problem lies in the lack of porting on your 02 housing and turbine housing. It easier for the exhaust to move through the turbo, then around it. Do you have a 3" down pipe?

 

[muas_kid]

your turbo might be bad and it shot your o2 sensor.

 

[90gsx16g]

So i just got my car runnin today after 2 weeks of down time and now its broken again. I drive a 90 gsx with evo16g turbo and some extra mods. Alright i was driving tonight for about 5 minutes when i decided to head back to get some sleep. So as i turned the car i started going straight for about 30 feet when i suddenly hear the loudest screeching noise and then my car starts to slow down then it dies. I try restarting it (which i know is a very bad idea) and it starts for a second then dies with finality and a good amount of black smoke starts coming up from under my hood i enede up pushing it back to my dorms and i cant see any noticble things. like there is no oil leak, no leak of any kind so far, smellt like a belt or something burning but i still have my timing belt in place.. any ideas???? It is very painfull to lose my car again after 5 minutes of being fixed.. Does anyone have any ideas as to where i should start?

True dsm spends more time in the garage then on the road

 

[90gsx16g]

Anyone got any ideas??