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02-12-2010, 09:52 AM
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#1 |
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Cylinder misfirings
Anyone able to give some ideas to troubleshoot this?
OnStar diagnostics told me the misfire codes were generated from the cats o2 sensor readings. Understandable since i have long headers and high flow cats. GM wont work on it obviously since "powertrain" has been modified. I tuned it (trifecta) and it appears to run much better. During WOT though, I'll still get misfirings. If I ease up and drive like a grandmother, it will clear out and operate normally again. Couple things in my head: I need to still pull logs so Vince can tweak it... so potentially the O2 readings were increased / just not enough. Intake vacuum ? Spark plugs ? I just find that disturbing to think it could be those with 6k miles. Any thoughts or suggestions?
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Mods: Hennessey CAI, MBRP Exhaust, Stainless Works 1 5/8 Long Tube Headers and High Flow Cats, Trifecta Tuned
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02-12-2010, 10:17 AM
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You Can Call Me Jay
Drives: 2010 1LT RJT Manual w/CAI & Solo Join Date: Sep 2009
Location: Louisville, KY area
Posts: 1,284
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send Vince the logs...that's about the only thing you can do right now.
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02-12-2010, 10:19 AM
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I'm not totally useless..
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I haven't read of anyone that has been able to tune LT's AND have the rear O2's work properly. Between the relocation and the wiring extensions everyone I have seen has had to have them disabled in the tune to not get an MIL or ON* issues....
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02-12-2010, 11:50 AM
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I'm just wondering if I should start looking elsewhere too... compression test, vacuum test, etc
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Mods: Hennessey CAI, MBRP Exhaust, Stainless Works 1 5/8 Long Tube Headers and High Flow Cats, Trifecta Tuned
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02-12-2010, 11:53 AM
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I'm not totally useless..
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Quote:
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02-12-2010, 03:48 PM
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Can feel it. Rather... could feel it. Vince is a great guy. I pulled some logs, he found the issue and sent me a new tune. Flashed it before driving for lunch today and cleared it all up.
It was getting too much fuel actually and flooding the mixture.
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Mods: Hennessey CAI, MBRP Exhaust, Stainless Works 1 5/8 Long Tube Headers and High Flow Cats, Trifecta Tuned
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02-12-2010, 03:54 PM
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Red Brick of Vengeance!
Drives: 12 Second Brick Join Date: Jun 2009
Location: at my pulpit
Posts: 7,745
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Quote:
I have to say I've been very impressed with Vince! 
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02-12-2010, 04:05 PM
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#8 |
        
Drives: 2010 1LT RS Rally Yellow Join Date: Oct 2009
Location: southern Illinois
Posts: 2,973
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Okay, speaking of Vince and Trificta, any updates to dyno numbers?
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 PacMan |
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02-12-2010, 04:07 PM
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Red Brick of Vengeance!
Drives: 12 Second Brick Join Date: Jun 2009
Location: at my pulpit
Posts: 7,745
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Quote:
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02-12-2010, 04:19 PM
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Drives: 2010 1LT RS Rally Yellow Join Date: Oct 2009
Location: southern Illinois
Posts: 2,973
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Quote:
  
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PacMan |
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02-12-2010, 04:40 PM
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#11 |
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Yah, he's tweaking my tune now that my fuel mixture is good and stable.
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Mods: Hennessey CAI, MBRP Exhaust, Stainless Works 1 5/8 Long Tube Headers and High Flow Cats, Trifecta Tuned
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