black smoke

[brs86supra]

i just recently noticed black smoke coming out of my exhaust. everything that is behind my car has little blacks specs on them when i rev the engine up. my spark plugs are black could this be my problem, adn my o2 sensor is also black. what could be causing this to happen. the car is a 87 turbo

 

[SPD TRP]

Sounds like you're running rich, most mkIII's seem to do this naturally, mine does. Is this car all stock, no aftermarket fpr or other mods?

Wayne

 

[brs86supra]

the only thing that isn't stock is the air filter, and the lower intercooler pipe

 

[skim1040]

Could very well be a serious boost leak. The car "thinks" that it is getting x amount of air from the turbo, so it puts in x amount of fuel to match. But, because of the leak, the car runs WAY too rich, causing the black smoke.

 

[Mr.PFloyd]

boost leak. check the 3000pipe to throttle body coupler, it is usually cracked. thats where my leak was from. needless to say i was shooting flames unintentionally sometimes

 

[Boost Lee]

My car leaves streaks of black smoke when doing interstate pulls.

I don't have a boost leak.

Seriously though, If you are basically stock and are seeing black smoke, you are running really rich. As said above, running rich means too much fuel or not enough air. In your case, you probably have a boost leak (air), therefore there is not as much air, meaning more fuel = rich = black smoke!

Make a boost leak tester. Makes things much easier and quicker to find.

Jeff

 

[skim1040]

check the 3000pipe to throttle body coupler, it is usually cracked.

:word8kn:
I had a black smoke problem, and I checked around, and couldn't find any leaks in the lower IC pipes...turns out, it was this coupler. Replace it with silicone and you'll be good to go!

When driving does your car feel any different? Laggy? Hesitates etc.?
If so, thats another good indication of a boost leak

 

[brs86supra]

yeah it does seem kinda laggy and hesitant sometimes