System Too Lean Bank1/Bank2
10-08-2014, 12:17 AM
#21
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I have no idea when the problem started. This is the first time I have ever looked for DTCs since I have owned the vehicle. As far as I can tell, it has run exactly the same from the day I bought it until today.
10-08-2014, 06:57 PM
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I adjusted my Idle/Power Enrichment settings a bit and cleared the DTCs. The CEL has not returned. I'm not sure if it's actually fixed, or if it just hasn't met the correct conditions to re-activate the check engine light.
10-08-2014, 07:05 PM
#25
Sounds like you made an adjustment that should at least get you out of a possible "danger zone" of idling lean which seems like it isn't that big a deal anyway unless you leave your car idling for hours on end...not ideal anyway.
My non-professional recommendation:
#1 Drive it like you stole it.
#2 Repeat.
My non-professional recommendation:
#1 Drive it like you stole it.
#2 Repeat.
10-10-2014, 09:02 AM
#29
Hmm. Harbor Freight sells a kit for about $20. It's not super quality but works and has the right adapter for LS1. Just make sure you get the gauge on tight to the hose or it will leak.
http://www.harborfreight.com/fuel-in...ter-92699.html
It's what I use. If I used it all the time I'd get a higher quality piece but that's that. I think parts stores lend something similar too.
http://www.harborfreight.com/fuel-in...ter-92699.html
It's what I use. If I used it all the time I'd get a higher quality piece but that's that. I think parts stores lend something similar too.
10-10-2014, 09:40 PM
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Didn't get off work 'til after hours for the mechanic shop. I'm trying to locate a friend with a fuel pressure tester. I don't really want to wait for one to arrive in the mail if I don't have to. Although, I realize I could have ordered one to begin with and had one by now 
10-12-2014, 11:18 PM
#32
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Saw the door open and lights on at a local mechanic shop, pulled in said my LT fuel trims are at 25/25. he said " vacuum leak" $50 to find it, but I will check for a dirty fuel filter first. I agreed, but he couldn't find his adapter for Schrader valve so still no luck on fuel pressure. he said come back another time. Hope to follow up on that soon.
10-13-2014, 07:36 PM
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How much does a " Lean Condition" effect performance? I owned a 2006 GTO 6.0L/6spd and it was very fast, even with worse gears (3.55 as compared to the CTS-V's 3.73s). The GTO being a bit lighter (125lbs) and sharing 400hp and only having a 5ft-lb torque advantage. I really feel like the CTS-V is an absolute pig compared to my GTO which always felt fast, no matter what gear or rpm. Is the LS6 (even with the exact same HP and only 5ft-lbs less torque) truly THAT MUCH SLOWER than a 6.0?
10-16-2014, 04:01 PM
#34
lean condition could also be caused by an exhaust leak before/close to the oxygen sensors. the problem is usually injector, vacuum and/or exhaust leak related. the problem with an exhaust leak is that the computer is going to compensate for the false lean condition by adding more fuel (as indicated by your LT fuel trims), and create a very real rich condition for prolonged periods... THIS will destroy your cats since they need the periodic lean condition to actually work. the problem with injector/vacuum issues is the possibility of an actual lean condition with detonation.
to answer your question about performance... if it's a false lean, and the computer is compensating, you'll run rich (10.9 on bank 2) which will certainly hamper performance.
to answer your question about performance... if it's a false lean, and the computer is compensating, you'll run rich (10.9 on bank 2) which will certainly hamper performance.
Last edited by spent21; 10-16-2014 at 04:06 PM.
10-19-2014, 05:27 AM
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I been a little worked up the last couple weeks. The ear infection leading to being unable to hear out of my right ear and working so many extra hours at work I been pretty stressed. I'm having my lean condition professionally diagnosed/repaired later this coming week. As a side note - I'm going to install Pacesetter coated headers, a Nick Williams 92mm throttle body and a 228R camshaft. If I'm still not happy with the performance I'm going with some N20
10-20-2014, 10:44 PM
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I found the vacuum leak. It was a very obvious vacuum nipple at the rear-most passenger side that had nothing attached to it. An open 1/8" diameter hole directly into the manifold certainly doesn't do the engine any favours, I reckon. Absolutely cannot find any vacuum lines in the are that could possibly attach to the manifold, so I simply plugged the port and all is good. Fuel trims corrected themselves almost instantly and the car feels stronger than ever.