LS6 missing

**crazytglo** · 04-01-2015, 01:10 PM

Howdy fellas, my Ls6 in my 04 V started missing the other day. Intermittent at first then just got worse. Not throwing any codes either. I've changed the plugs and wires, the plugs on the driver side were white and lean I'm assuming and the passenger side plugs were black and rich. I changed them all out and decided to change the driver side o2 sensor seeing how that side was lean. Got everything done and she is still missing...??? While under the car I did notice a small exhaust leak at the header flange that had soot buildup on the underbody of the car...not sure if that would cause this.

Any help would be appreciated.
Car has cam(don't know what), CAI, headers and Ypipe.

***SMWS6TA*** · 04-01-2015, 01:22 PM

When is the last time you clean your MAF sensor?

Paper or K&N air fliter?

**Whamhammer** · 04-01-2015, 02:48 PM

Originally Posted by crazytglo

Howdy fellas, my Ls6 in my 04 V started missing the other day. Intermittent at first then just got worse. Not throwing any codes either. I've changed the plugs and wires, the plugs on the driver side were white and lean I'm assuming and the passenger side plugs were black and rich. I changed them all out and decided to change the driver side o2 sensor seeing how that side was lean. Got everything done and she is still missing...??? While under the car I did notice a small exhaust leak at the header flange that had soot buildup on the underbody of the car...not sure if that would cause this.

Any help would be appreciated.
Car has cam(don't know what), CAI, headers and Ypipe.

Also, is it missing at idle, or while under load?

**crazytglo** · 04-02-2015, 12:20 PM

It was missing at idle slightly and then real bad under load. I took out the passenger side o2 and put the one I took out of the driver side and it cleared up nicely. No miss. Drive it for about 30 mins and everything was good.

**cammed goat** · 04-02-2015, 06:59 PM

New O2 was probably defective. Glad you got her back to normal.

**crazytglo** · 04-05-2015, 08:45 PM

Originally Posted by cammed goat

New O2 was probably defective. Glad you got her back to normal.

Maybe I said it wrong, it was the old passenger side o2 that was bad. It was wired back together by the previous owner. Either to extend it for the extra length needed to reach the header or it burned up touching the header.