lean codes from HE**

[not2oldchevy]

Can anybody tell me how to cure lean codes Tried everything from swapping parts to smoke and everything anyone has told me for 4000 miles . Still get both codes every time I drive it .Could it be in the tune? Runs good no other codes in over 4000 miles.?????????????????????????????????????? 03 5.3 in a 3100.

[87chevy.com]

install wide band and verify. not sure how else to verify. A wide band is good to have anyway...

[LeesTruk]

Have you checked your fuel pressure? Could be you have a dirty/clogged fuel filter. If that's the case, check your fuel tank, inside, for rust.

[Joyridin]

Could it be the location of your O2 sensors?

[not2oldchevy]

Cannot find anyone with wideband. I am to old and dumb to learn, Fuel pressure is right new tank - fuel lines - filter - pump and FPR 02 sensors are in exhaust manifolds they are from early C5 corvette. THANKS

[ls1nova71]

Is it a flex fuel engine? Who tuned it?

[MySons68C20]

Originally Posted by not2oldchevy

Cannot find anyone with wideband. I am to old and dumb to learn, Fuel pressure is right new tank - fuel lines - filter - pump and FPR 02 sensors are in exhaust manifolds they are from early C5 corvette. THANKS

You are NOT to old or dumb to learn! I installed this one in an afternoon.
https://www.summitracing.com/parts/avm-30-0300
If you don't weld an exhaust shop can install the bung for you.
The hardest part of the whole install was figuring out how to route the wires.
I ended up running the through an existing hole on the firewall next to the column. The gauge is easy to read and responds very quickly.
Hope this helps!

[not2oldchevy]

Not flex fuel PSI harness Sent computer that came out of same avalanche as engine for PSI to delete vats I do not know if they changed the tune . LTFT stays at +25 most of the time Would an aftermarket tuner like a diablo fix it?

[Willie Makeit]

if your LTFT are at 25% then you got a serious lean issue that needs to be addressed in the tune. NO amount of hardware is going to fix that. It being that lean, I'm actually surprised you haven't already damaged the engine. A diablo-style tuner won't "fix" it, you need someone with HP Tuners to get into those type of changes.

[87chevy.com]

i had a buddy that had a crazy lean problem on a l83 swap.. i actually smoke tested his exhaust, found he forgot to weld the exhaust flange or o2 bungs in all the way..

it seems like you only have 2 options:
Buy and learn how to use the wide band ... youtube will teach you... teaches everything practically

or

pay more money and have a shop do it for you.. will cost far more than 250$

forums can only help so much

clint

[zach_carver]

Im experiencing a similar issue currently. My tuner has found my injectors are not operating 100%. Ive recently replaced the injectors but we have not finished the fine tuning yet to see if issue is resolved. My injectors were nasty and partially clogged from sitting for years with ethanol in them.