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Republican
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black smoke is fuel, better then running to lean, i'm not sure that is normal for mk4's though....
 

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Registered
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i blow black smoke out also, but its because my a/f is really rich....like said above...much better than running lean
 

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1000hp thanks to SP
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598 Posts
yep, its rich, tune it. Even though its better than being lean, its not great for the car. Plus, dont you want more power and better spool?:)

Greg
 

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Discussion Starter #6
Actually, I figured you guys would say it was because it was rich, but my car actually runs very lean. Close to 13.00..... I know that's definetly not good for it, and I don't drive it hard at all to find out if a 13.00 a/f will kill an engine, but is there anything else that could be causing the smoke or is a 13 a/f still rich enough to cause black smoke?
 
R

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Guest
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If your getting that 13.0 off the stock narrowband sensor..I doubt it's right..
 
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well if you have an fjo you prob have seen to it that your plugs are good ...right? What are you tuning fuel with?
 

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Useless Member
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717 Posts
maybe you need to clean your throttle body

i was discussing this with a friend and i think chevron puts out a TB cleaner. well he said he used it (and a fuel system cleaner) and got puffs of black smoke initially b/c the TB was so dirty and it was due to burning off deposits.

i dont know how true this is, but hey, maybe those cleaners couldn't hurt?
 

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boostin'
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Midnight Hour said:
Actually, I figured you guys would say it was because it was rich, but my car actually runs very lean. Close to 13.00..... I know that's definetly not good for it, and I don't drive it hard at all to find out if a 13.00 a/f will kill an engine, but is there anything else that could be causing the smoke or is a 13 a/f still rich enough to cause black smoke?
well, if you're getting black smoke right when boost hits, what is your a/f right then? Is your 13.0 a/f at the top end or across the board? Because I would think that even if you're running leaner up top, once the turbo hits in the midrange--if it's a rich spot--you could see black smoke just for that instant..
And/or you could be blowing off carbon desposits from the motor. If that's the case, what is your oil consumption like? If it's slightly above normal, oil deposits/carbon build-up from on tops of the pistons could be blowing out, which could also look dark.
 

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Discussion Starter #14
Vader M3 said:
And/or you could be blowing off carbon desposits from the motor. If that's the case, what is your oil consumption like? If it's slightly above normal, oil deposits/carbon build-up from on tops of the pistons could be blowing out, which could also look dark.
As a matter of fact, if I pull into my carport backwards, and my exhaust is facing the wall, I can spray some black shit on the wall. That could definetly be my problem. What would cause that? The short-block has about 13k miles on it.
 
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