04chevy5.3

I think that i have a small exhaust leak on the drivers side. When i am logging with hp tuners bank 1 is consistently about 2% leaner than bank 2. How much will this affect my tune and how much will this affect performance? Thanks

budhayes3

iTrader: (19)

An exhaust leak will allow unmetered air to be drawn into the exhaust and give the O2 sensor a false signal...this could definitely have an effect on your tune and performance, especially if the leak is substantial.

04chevy5.3

I know that an exhaust leak will make the o2s read leaner which in turn will make the motor run a little richer. But is 2% enough to make a big difference? BTW, I can barely here the leak.

dc_justin

iTrader: (13)

2% variance between banks doesn't signify an exhaust leak, that's just a normal variation, especially with it being the driver's bank on a naturally aspirated motor, very typical.

04chevy5.3

So its not a problem then that going to affect my tuning or performance?

dc_justin

iTrader: (13)

Nope, not at all.

It's a problem when variations between the banks are significantly larger...

04chevy5.3

Sounds great...thanks for the help!

budhayes3

iTrader: (19)

Yea, guess I should've read a little closer...2% is definitely within spec and totally normal...sorry bout that