02 sensor problem

[Mt Panarama]

Heres one for all you ls1 buffs...Got a new set of extractors, exhaust (2 and a half into a 3 and a half) and cats. My engine light in the dash keeps turning on and off. Apparently my 02 sensor is compensating and then overcompensating then vice versa ( lean then too lean etc). How can I fix this?

[bluess57]

Only real fix is new O2 sensors... Get them checked first with a scan tool.
The "sensitivity" values can be adjusted in the pcm with edit/tune

Also may want exhaust place to check depth/placement of O2 in the exhaust pipe, they need heat to operate correctly.

[Beej]

Heres one for all you ls1 buffs...Got a new set of extractors, exhaust (2 and a half into a 3 and a half) and cats. My engine light in the dash keeps turning on and off. Apparently my 02 sensor is compensating and then overcompensating then vice versa ( lean then too lean etc). How can I fix this?

What is actually happening is that your O2 sensors were probably on the way out anyway, and the new exhaust has caused their "switching rate" or sensitivity to drop below the threshold required by the PCM diagnostics, due to the changed exhaust gas flow you now have.

No rush to change them as long as idle quality and cruise fuel economy is still good. When these start to suffer then you will need to throw a new set in.Also you should confirm the DTC codes that are actually being thrown as well (post here id you like or search for the ones you are getting on here - Someone with a tech2, EFI-live or similar will be needed to read the codes).

Cheers,

Beej