I have an LS 6.0 that just threw a couple of codes at me. Looks like I'm lean on both banks. Any ideas on where to start to solve the problem?
CK5
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LS lean on both banks?
- Thread starter ashman
- Start date
Come over to the dark side? 
Cookies make everything, me included, not so lean.
Cookies make everything, me included, not so lean.
63chevyll
1/2 ton status
Intake gaskets
Take some carb cleaner and spray at the intake runners. Chances are they are leaking, gm Had a problem with the green gaskets and replaced them with updated Orange seals.
Put a wicked low compression 400 small block in and give no more $hits 
Jk. I'm guessing bens idea is correct.
Jk. I'm guessing bens idea is correct.
Post up the code to.
Team208Motorsports
Its Magic Bitch
Intake leak, intake crack, FPR kapoot, FP kapoot. Verify FP and post up idle KPA. If you are stock and over 40 kpa then some type of leak or loaded engine.
What manifolds/headers? Is it something new? What is fuel trim at idle and cruise?
If all that is good its time to look at O2 cycling rates.
lol, I'll save that for plan B.Put a wicked low compression 400 small block in and give no more $hits
Jk. I'm guessing bens idea is correct.
The codes: P0171, P0174
Everything is stock (although stuffed into my '72). Nothing is new. An intake leak or crack seems like the likely culprit.
FPR, FP, KPA?? What is that?
Team208Motorsports
Its Magic Bitch
Everything is stock (although stuffed into my '72). Nothing is new. An intake leak or crack seems like the likely culprit.
FPR, FP, KPA?? What is that?
LOL!!
FPR - Fuel pressure regulator
FP - Fuel Pump
KPA - Vacuum
Hook up a scanner, warm up engine and get live data going. Look at KPA and fuel trims at idle. If KPA and trims are high odds are its vacuum leak. If just trims then check fuel pressure.
I would put money on thew intake gaskets
79bonanza
1/2 ton status
I had a 02 Silverado do the same, ran alright for saying it was that lean. Ended up being a leaky brake booster. Just a different angle to look from
I'm running hydroboost, but that's another vote for vacuum leak.
Thanks.
I'll check it and see what I get.You know, it's funny. Several months back, right before I put the front clip on I helped a buddy with an '03 Tahoe replace his intake gasket. He bought 2 from different manufacturers just to compare quality (they were identical). When we got done I considered taking his 2nd gasket and replacing mine but decided naaa, it'll be fine.
If you pull the intake might do the knock sensor too, seems like they were problematic. Josh could confirm...
Team208Motorsports
Its Magic Bitch
Absolutely do this. At least check them and if all is good seal the covers with RTV. Then throw away the foam under the intake.
Ok, I let it idle for a bit while looking at my torque app (only scanner I have). I don't know what high values are but I did watch the fuel trim on both banks. It varied between 0.0 and -3.9 for the most part.
I couldn't find a vacuum reading on the app.
That said, after a bit the MIL went off. I cleared the codes and will see if they come back.
Team208Motorsports
Its Magic Bitch
Can you see if the code stored history data of all the parameters when it tripped. If it did take a screen shot and post it.
What headers/manifolds are you running? There is reasoning behind this question but no real need to answer unless the correct answer is given... LOL
I'll have to look for the history if it trips again. Never noticed it before so not sure.
I'm running stock manifolds.
I'm running stock manifolds.
Team208Motorsports
Its Magic Bitch
How long have you been finished and driving the conversion?
