Problem with one cylinder bank going lean.

**Sam-SS** · 10-31-2007, 01:38 PM

Hi There,

I am having a problem with one cylinder bank going lean between 1200 rpm and 1800 rpm. Everything has been checked that can be thought of but the problem persists. I have checked O2 sensors, exhaust leaks, intake leaks, and anything else that I can think of. It is going lean by about 300mv. This is driving me nuts.

Has anyone had this problem or have an idea as to what it might be? Oh, car is '99 SS w/heads, cam & headers. 404 RWHp.

...>>Sam

**180ls1** · 10-31-2007, 05:03 PM

if you have the fast intake i have heard of the number 7 piston going lean with that setup. what intake manifold do you have?

**Sam-SS** · 10-31-2007, 10:08 PM

Originally Posted by 180ls1

if you have the fast intake i have heard of the number 7 piston going lean with that setup. what intake manifold do you have?

Nah, mine is a LS6. Have you heard anything about them?

**0rion** · 11-01-2007, 04:08 AM

Originally Posted by Sam-SS

Hi There,

I am having a problem with one cylinder bank going lean between 1200 rpm and 1800 rpm. Everything has been checked that can be thought of but the problem persists. I have checked O2 sensors, exhaust leaks, intake leaks, and anything else that I can think of. It is going lean by about 300mv. This is driving me nuts.

Has anyone had this problem or have an idea as to what it might be? Oh, car is '99 SS w/heads, cam & headers. 404 RWHp.

...>>Sam

I'm gonna move this to the computer and tuning section. Might get more views in there. What do your fuel trims look like bank to bank?

**Sam-SS** · 11-01-2007, 06:13 AM

Originally Posted by 0rion

I'm gonna move this to the computer and tuning section. Might get more views in there. What do your fuel trims look like bank to bank?

Actually, I am not sure but I will find out from the person who is doing the work. I was hoping to find someone who had had similar symptoms and knew how to fix it to speed things up.

...>>Sam