[KRAM36]

Originally Posted by The Radium King

not change - add - a wideband o2 sensor. it's pretty standard tuner kit - sends signal to an afr gauge, datalogger, etc. typically use bosch units so threads are universal - check you exhaust for a spare bung (preferably before the cat). if not a permanent install you could probably just install in place of a post-cat o2 sensor and put up with an emissions code for a while. plx devices also make a unit that has a narrow band output so that you should be able to install in place of an oem 02 sensor.

this will give you wot afrs. however, if your trims aren't too out of whack when running closed loop then it is a safe assumption that you're ok open loop.

Very nice, thank you.

Originally Posted by The Radium King

did a bit of searching for you and the rkat is high. did you reset the ecu? otherwise perhaps check for air leak. a small leak has more effect at idle than it does at part or full throttle.

I did a vacuum leak test today. I did a very thorough check and the only place I would get a stumble at idle was at this port valve circled in red. Had my daughter run the engine up to 2k RPM and no stumble at that port valve.