Black stuff coming out of my exhaust - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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#1 (permalink) Old 07-17-2011, 03:40 AM
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Black stuff coming out of my exhaust

Hello guys, I have a bit of an issue regarding black stuff coming out of exhaust, it leaves a black mark on the pavement almost like droplets. It only basicly happens when I start up my car and rev it a bit then it goes away. I'm thinking it may be some oil mixing with water but I'm no expert. What do you guys think?

HE WHO DARES, WINS
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#2 (permalink) Old 07-17-2011, 03:45 AM
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Re: Black stuff coming out of my exhaust

Sorry forgot to mention I have an 1983 280zx 2+2 T-Top.

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#3 (permalink) Old 07-17-2011, 11:49 AM
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Re: Black stuff coming out of my exhaust

sounds like a very common cunooter valve sticking open. download a fsm for the diagnostic procedure

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83 280zx Turbo - MS2 v3.0, N42 head swap (8.3:1cr) 10psi
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#4 (permalink) Old 07-17-2011, 12:29 PM
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Re: Black stuff coming out of my exhaust

Condensation clearing out carbon from your exhaust. Probably running rich so how is your fuel mileage?

1975 280Z F54/N47 MSA 3-2 Header 2.5 Exhaust
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#5 (permalink) Old 07-17-2011, 06:47 PM
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Re: Black stuff coming out of my exhaust

when you start up the exhaust is fairly cold. byproducts of combustion are co, co2 and h2o. the h2o condenses on the cold metal. this dissolves part of the carbon deposits in the exhaust system and exhaust gas blows it out onto the pavement. if you are getting below 18-20 mpg you are probably running rich producing lots of unburnt carbon particles in your exhaust. 83280zx trying to be amusing disregard except for the part about the fsm at xenon. pretty much nothing to worry about. most cars do it to some extent. if low mileage try a tune up. if still running rich might be the chts is bad.

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#6 (permalink) Old 07-18-2011, 03:14 AM
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Re: Black stuff coming out of my exhaust

Thanks guys, I still have to work out how much petrol per kilometers my car uses, but in my opinion the old ZX ain't that heavy on petrol. Glad to hear it's not a bad issue, thought it were signs that she is going to die on me

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