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Old Nov 11, 2010 | 09:15 PM
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Default Running Rich

Black smoke comes out of my exhaust under heavy acceleration......whats the best way to fix this?
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Old Nov 11, 2010 | 09:18 PM
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is it running rich or burning oil?
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Old Nov 11, 2010 | 09:36 PM
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if it was burning oil wouldnt it be constant? it only does it under hard acceleration
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Old Nov 11, 2010 | 09:40 PM
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Probably just burning oil. It's an LS motor. It's what they do.
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Old Nov 11, 2010 | 09:54 PM
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Originally Posted by AlabamaGuy
Probably just burning oil. It's an LS motor. It's what they do.
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Old Nov 11, 2010 | 11:12 PM
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On the other hand, the stock tune is pig rich in PE mode (well it gets as rich as 12.1:1), so there is a fair bit of unburnt fuel leaving the cylinder when going WOT.
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Old Nov 12, 2010 | 12:08 AM
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Sounds like it's loaded up to me.

Does it smoke if you do you several successive WOT runs over the course of a minute or so? I know will mine smoke a little if I've not punched it in a while, but it goes away completely on the the second or third time.
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Old Nov 12, 2010 | 01:35 PM
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Same applies as in the RUNNING LEAN thread, adjustments need to be made!
Same recomendation as there, even if you find a CMR dyno tuner they can dyno tune for you if that is the route you want to go and you will be able to return it to stock tune at anytime.

The TRINITY can hold upto 8 custom tunes I believe!
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Old Nov 12, 2010 | 04:50 PM
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I would think its oil blow by at WOT.
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Old Nov 12, 2010 | 07:05 PM
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Just curious on your input on this. From my somewhat limited research on the LS engines, the ring packages is pretty tight on the pistons. However, I've heard that valve guides have a tendency to leak slightly. At WOT vacuum would be lower, and the guides is where I've heard more leaking occurs, so I'm not thinking oil is actually a factor here. But I'm wondering what leads you to say that blow-by is the reason.

-Adrian
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Old Nov 12, 2010 | 07:35 PM
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It's running rich! Scan it for codes. Is the engine or the tune modified?
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Old Nov 12, 2010 | 10:42 PM
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I was running really rich at 11:1 and sometimes worse and i couldnt notice a large amont of smoke so thats why i was thinkn oil. Really u should be able to smell the differnce.
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Old Nov 12, 2010 | 11:20 PM
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When my PVC was hooked up wrong I blew tons of oil out under throttle.
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