When Boost Rises, 02 Readings Fall.

[ZGN]

Originally Posted by RotaryResurrection

Even though it seems ass backwards in my mind, a bad coil or a fouled sparkplug that is not firing on one chamber, will cause an o2 sensor to read lean. I would expect it to read rich, due to all the unburned fuel coming through the exhaust from the non-firing chamber. But I have seen it a few times on my own car with a wideband when i was running 10.5 race plugs that foul at idle easily.

That said, i wouldnt rely on that stock sensor for jack shit. You can get a wideband with display for as little as $250 these days. Hell, if for no other reason, it will teach you to drive the car more efficiently for MPG when you're not on the throttle. You'll find out a couple of surprising things about when your engine is most efficient.

That is what I am suspecting also, I cleaned the plugs. but still same results.
I am useing a 2nd gen leading coil pack with a MSD6A. This weekend I'll desolder it all and reconnect it to reassure me it's not a loose wire. how do I verify the MSD6A is working properly? Or maybe my leading coil pack is going out again. I had previously blown a stock leading coil pack with this setup. It literary blew it apart.