corvet786c

iTrader: (6)

It reads Bank 1 sensor 1 is Lean

My mods are Ported MAF Screen removed, stock injectors custom handheld tune, Pacesetter LT Custom catted Y 222/228/115 cam stock heads. This code does not come on all the time but occasionally. I took cat to dealer on tech 2 and he said O2's look good it could be your fuel or ethanol they have in fuel or carbon build up. Does anyone have this same problem. My AFR from Dyno is 12.5-12.8 I dont know what else to change or do?

The car runs good as far as performance goes, Just the SES light come on and gives this code. All help appreciated!!!

corvet786c

iTrader: (6)

Can anyone help me??? It went off again today, so I cleared it. Could it be my stock injectors, car has 86000 miles??????

corvet786c

iTrader: (6)

Does anyone know this code P0171. What causes it???

pdsq98gt

Have you had it tuned? Do you have an exhaust leak on bank 1?

corvet786c

iTrader: (6)

Everything has been tuned. I dont hear any leaks from exhaust when engine is running. I did check for a vacume leak where the blk rubber hose reaches the manifold on passenger side. There was some light black soot on my fingers, had faint smell of gas. So I put a zip tie to it. I dont know if this was the culprit, but I hope so.

I have stock MAF (ported) I check everything I could as far as hoses. With exception of what I just explained above.

pdsq98gt

You need to check your fuel pressure and if that's good, check for vacuum leaks. This is all assuming that the entire tune is spot on and not just WOT.

jrtf83

currently dealing with the same code. From searching on here, it looks like its:

Vacuum leak after the MAF
Aftermarket MAF
Dirty MAF
o2 sensor

Still haven't tracked it down though...

corvet786c

iTrader: (6)

Thanks I fixed mine now. It was yes a vacuum leak from the rubber hose on passenger side goin into intake manifold, It was loose and had some black stuff on bottom of it. Smell of Gas. I zip tied two areas that one and the rubber piece that connects to intake. Guess what no more SES light comin on Problem fixed.

I wish I had known this before taking car into dealer on a TECH 2 machine. Could've saved $50.00 bucks. Hope this helps.