Black Smoke issues

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Sep 27, 2006 | 06:25 PM

PSUstanghunter

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Black Smoke issues

I own a '99 SS with the STS rear mount kit making a comfortable 10psi. I've noticed lately that the car will make full boost, but then around 3300 rpm it will buck. Also every now and then when i hammer it, it throws out black smoke, alot of it. Ive never had any problems with the car since I purchased it. I was wondering if you guys had any thoughts before I haul it into my mechanic and spend a ton of cash i dont have right now. Thanks in advance.

Sep 27, 2006 | 06:37 PM

Smearin

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From: Colorado

Holy Richness Batman!!!

Whats your a/f ?
what size turbo?

Sounds like your running rich.... real rich....How much smoke?

I was gonna say choking the turbo... but at 3300.. hmmm

maybe your tires are just spinning and then your hooking?

Sep 27, 2006 | 08:35 PM

PSUstanghunter

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The car has been running fine though, it was tuned. It's not spinning the tires. If I mat it it bucks like 3 or 4 times then goes normal. Someone help me out here

Sep 27, 2006 | 10:04 PM

Smearin

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From: Colorado

Do you have a wideband? whats your a/f? What size turbo? any unusual sounds coming from the turbo?

Anything to work off here?

Sep 28, 2006 | 04:28 AM

PSUstanghunter

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I have a wide band, the a/f doesn't look any different than it normally does. The turbo is a t-76.. nothing sounds unusual something specific I should be listening for? Please help guys

Sep 28, 2006 | 05:55 AM

PSUstanghunter

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You could probably also consider the "buck to be a hesitation? It does it 2 or 3 times around 3300 or so and then things kick in and go.

Sep 28, 2006 | 07:13 AM

turbolx

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From: Detroit, Murder City

$10 says spark knock nearing peak torque/cylinder pressure...

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Sep 28, 2006 | 11:38 AM

PSUstanghunter

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Aside from the fact that it may be running somewhat rich, is there a possibility that stale gas could cause the bucking/hesitation?

Sep 28, 2006 | 04:36 PM

#10

Smearin

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From: Colorado

Whats your a/f @ WOT? Are you running premium? What plugs are you running?

Sep 28, 2006 | 04:39 PM

#11

JD_Z28

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From: Arizona

You could be burning oil. Have you checked your resistor and cats.

Sep 28, 2006 | 09:03 PM

#12

PSUstanghunter

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Ok guys, I put some fresh gas in the car today and drove it around.. It is now appearing to be running fine. I think I may still be a little rich, which I will go get a dyno/dynotune done to fix that. I let the car rest a couple of different times for like 2 hrs the first time and like 6 the 2nd and it is running just fine and dandy. Odd.