Figure I better get this right, because the autotune will not work correctly unless I do. At idle, my wideband gauge is reading correctly, but in MT it's reading around 16.7afr. EGO settings must be off. Anyone else here using a PLX wideband and care to share the settings?

 

Think I may have found my answer, but still not sure why the readings in MT are incorrect.

http://www.plxdevices.com/products/w...utputGraph.jpg

 

Check the voltage at the connection to the MS - what voltage is it reading at what AFR?

 

Make sure your PLX is grounded to the same spot as your MS.

 

I'm going to assume you are talking about the factory ECU ground under the brake booster? Currently the wideband is grounded inside the car under the center console.

 

I always recommend this with Innovate units, and it would be a good idea to do it with a PLX as well: Ground the wideband directly to the block or to the cylinder head. Don't try grounding it to the chassis; that's just asking for ground offsets.