WhiteThunderZ28

My left bank runs richer than the right and the car dumps more fuel making it run rough... I swapped out the injectors and the old ones were fine. There are no vacuum leaks.

I have a MADZ28 but that wouldnt cause a problem, the problem has been here for a longtime...

Anyone think that is the knock sensor at all? BTW the o2's are new and they are Delco's,

Thanks

Red on Red WS6

Can you post up a data log in .csv? Do you know what your IAC counts are at while idleing with norm. operating temps?

97WS6SCharged

Idle, cruise, WOT, all the time? How big is the split?

Injuneer

The knock sensor isn't going to cause one bank to run richer than the other.

Check for misfires or exhaust leak on the left side. Check the quality of the O2 extension on that side. Look for a high voltage wire running close to and in parallel with the O2 sensor wire. Look for external contamination of the O2 sensor. Did you use anti-sieze or any sealant on the sensors? Did you wait a while to replace them after the long tube install? And answer the question immediately above.... when does the problem occur, and how have you determined that it is running richer on one side than the other?

WhiteThunderZ28

This happens at Idle, crusing, WOT. So basically all the time.

The way I know that is I hooked up an AF gauge and put a toggle switch on it to measure both sides. I did this when the car was stock and both banks were equal.
Now when I modded it with the headers and new o2's (Did not install them till after the install of LT's) Now the left is richer than the right.

There is sealant on the o2's and no HI voltage wire running parralle.

Im going to see what i can do. I have freescan but that only tells me so much and I dont have any other free software to measure the car.

WhiteThunderZ28

I friend of mine with an Imp SS thinks it might have something to do with the valvetrain on the left bank.

97WS6SCharged

Sounds like just a leaky header gasket. Run freescan or download datamaster (free for 20 uses) and see what you get. Trying to judge air/fuel ratios from anything short of a wide band gauge is pointless.

Sweetred95ta

How rich are you talking about? I think the left bank runs SLIGHTLY richer than the right bank anyways. At least that's what I've been told.

Edit: I just saw that you're doing this with the narrow band O2s. As 97WS6SCharged said, it's pointless unless you have a wideband O2 setup.

Injuneer

Really hard to understand how you determined from an A/F gauge and toggle switch that the banks were equal. At idle and at part load, the A/F gauge is going to be dancing all over the place. At WOT is the only place you would see a stable reading.

The fact that you moved the O2 sensor on/with the headers is enough to change the operating temperature and cause them not to behave at WOT the same way they did before the headers. At values like 12.5-13.5:1 the sensors are more sensitive to changes in the operating temperature than they are to changes in A/F ratio.

The scan/data log would help because that should show if the BLM's are unbalanced side to side. You may be chasing a problem that doesn't exist.

You shouldn't use sealant on the sensors. Shouldn't use anti-sieze. The GM sensors are coated with conductive anti-sieze at the factory.

If it is a real problem, and it changed with headers, its most likely related to the headers.... leaks, burned wire causing misfire, contaminated sensor on one side, faulty extension on one side, etc.

WhiteThunderZ28

I meant I used anti-seize.. Ill find out tomarrow to see whats up.

WhiteThunderZ28

whats the website to get the free data master?

97WS6SCharged

http://www.ttspowersystems.com/DM_Software.htm